Pre-content hooks in page faults introduces potential deadlock of HSM
handler in userspace with filesystem freezing.
The requirement with pre-content event is that for every accessed file
range an event covering at least this range will be generated at least
once before the file data is accesses.
In preparation to disabling pre-content event hooks on page faults,
add pre-content hooks at mmap() variants for the entire mmaped range,
so HSM can fill content when user requests to map a portion of the file.
Note that exec() variant also calls vm_mmap_pgoff() internally to map
code sections, so pre-content hooks are also generated in this case.
Link: https://lore.kernel.org/linux-fsdevel/7ehxrhbvehlrjwvrduoxsao5k3x4aw275patsb3krkwuq573yv@o2hskrfawbnc/
Suggested-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20250312073852.2123409-2-amir73il@gmail.com
- Fix the regmap settings for bcm281xx, this was missing the
stride.
- NULL check for the Nuvoton npcm8xx devm_kasprintf()
- Enable the Spacemit pin controller by default in the
SoC config. The SoC will not boot without it so this one
is prett much required.
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Merge tag 'pinctrl-v6.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
- Fix the regmap settings for bcm281xx, this was missing the stride
- NULL check for the Nuvoton npcm8xx devm_kasprintf()
- Enable the Spacemit pin controller by default in the SoC config. The
SoC will not boot without it so this one is pretty much required
* tag 'pinctrl-v6.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: spacemit: enable config option
pinctrl: nuvoton: npcm8xx: Add NULL check in npcm8xx_gpio_fw
pinctrl: bcm281xx: Fix incorrect regmap max_registers value
- Fix out-of-bounds access on CPU-less AMD NUMA systems by the
microcode code.
- Make the kernel SGX CPU init code less passive-aggressive about
non-working SGX features, instead of silently keeping the driver
disabled, this is something people are running into. This doesn't
affect functionality, it's a sysadmin QoL fix.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2025-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Fix out-of-bounds access on CPU-less AMD NUMA systems by the
microcode code
- Make the kernel SGX CPU init code less passive-aggressive about
non-working SGX features, instead of silently keeping the driver
disabled, this is something people are running into. This doesn't
affect functionality, it's a sysadmin QoL fix
* tag 'x86-urgent-2025-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes
x86/sgx: Warn explicitly if X86_FEATURE_SGX_LC is not enabled
The VMBus driver manages the MMIO space it owns via the hyperv_mmio
resource tree. Because the synthetic video framebuffer portion of the
MMIO space is initially setup by the Hyper-V host for each guest, the
VMBus driver does an early reserve of that portion of MMIO space in the
hyperv_mmio resource tree. It saves a pointer to that resource in
fb_mmio. When a VMBus driver requests MMIO space and passes "true"
for the "fb_overlap_ok" argument, the reserved framebuffer space is
used if possible. In that case it's not necessary to do another request
against the "shadow" hyperv_mmio resource tree because that resource
was already requested in the early reserve steps.
However, the vmbus_free_mmio() function currently does no special
handling for the fb_mmio resource. When a framebuffer device is
removed, or the driver is unbound, the current code for
vmbus_free_mmio() releases the reserved resource, leaving fb_mmio
pointing to memory that has been freed. If the same or another
driver is subsequently bound to the device, vmbus_allocate_mmio()
checks against fb_mmio, and potentially gets garbage. Furthermore
a second unbind operation produces this "nonexistent resource" error
because of the unbalanced behavior between vmbus_allocate_mmio() and
vmbus_free_mmio():
[ 55.499643] resource: Trying to free nonexistent
resource <0x00000000f0000000-0x00000000f07fffff>
Fix this by adding logic to vmbus_free_mmio() to recognize when
MMIO space in the fb_mmio reserved area would be released, and don't
release it. This filtering ensures the fb_mmio resource always exists,
and makes vmbus_free_mmio() more parallel with vmbus_allocate_mmio().
Fixes: be000f93e5 ("drivers:hv: Track allocations of children of hv_vmbus in private resource tree")
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250310035208.275764-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250310035208.275764-1-mhklinux@outlook.com>
Currently, load_microcode_amd() iterates over all NUMA nodes, retrieves their
CPU masks and unconditionally accesses per-CPU data for the first CPU of each
mask.
According to Documentation/admin-guide/mm/numaperf.rst:
"Some memory may share the same node as a CPU, and others are provided as
memory only nodes."
Therefore, some node CPU masks may be empty and wouldn't have a "first CPU".
On a machine with far memory (and therefore CPU-less NUMA nodes):
- cpumask_of_node(nid) is 0
- cpumask_first(0) is CONFIG_NR_CPUS
- cpu_data(CONFIG_NR_CPUS) accesses the cpu_info per-CPU array at an
index that is 1 out of bounds
This does not have any security implications since flashing microcode is
a privileged operation but I believe this has reliability implications by
potentially corrupting memory while flashing a microcode update.
When booting with CONFIG_UBSAN_BOUNDS=y on an AMD machine that flashes
a microcode update. I get the following splat:
UBSAN: array-index-out-of-bounds in arch/x86/kernel/cpu/microcode/amd.c:X:Y
index 512 is out of range for type 'unsigned long[512]'
[...]
Call Trace:
dump_stack
__ubsan_handle_out_of_bounds
load_microcode_amd
request_microcode_amd
reload_store
kernfs_fop_write_iter
vfs_write
ksys_write
do_syscall_64
entry_SYSCALL_64_after_hwframe
Change the loop to go over only NUMA nodes which have CPUs before determining
whether the first CPU on the respective node needs microcode update.
[ bp: Massage commit message, fix typo. ]
Fixes: 7ff6edf4fe ("x86/microcode/AMD: Fix mixed steppings support")
Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250310144243.861978-1-revest@chromium.org
The kernel requires X86_FEATURE_SGX_LC to be able to create SGX enclaves,
not just X86_FEATURE_SGX.
There is quite a number of hardware which has X86_FEATURE_SGX but not
X86_FEATURE_SGX_LC. A kernel running on such hardware does not create
the /dev/sgx_enclave file and does so silently.
Explicitly warn if X86_FEATURE_SGX_LC is not enabled to properly notify
users that the kernel disabled the SGX driver.
The X86_FEATURE_SGX_LC, a.k.a. SGX Launch Control, is a CPU feature
that enables LE (Launch Enclave) hash MSRs to be writable (with
additional opt-in required in the 'feature control' MSR) when running
enclaves, i.e. using a custom root key rather than the Intel proprietary
key for enclave signing.
I've hit this issue myself and have spent some time researching where
my /dev/sgx_enclave file went on SGX-enabled hardware.
Related links:
https://github.com/intel/linux-sgx/issues/837https://patchwork.kernel.org/project/platform-driver-x86/patch/20180827185507.17087-3-jarkko.sakkinen@linux.intel.com/
[ mingo: Made the error message a bit more verbose, and added other cases
where the kernel fails to create the /dev/sgx_enclave device node. ]
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Kai Huang <kai.huang@intel.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250309172215.21777-2-vdronov@redhat.com
The hypercall in hv_mark_gpa_visibility() is invoked with an input
argument and an output argument. The output argument ostensibly returns
the number of pages that were processed. But in fact, the hypercall does
not provide any output, so the output argument is spurious.
The spurious argument is harmless because Hyper-V ignores it, but in the
interest of correctness and to avoid the potential for future problems,
remove it.
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250226200612.2062-2-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250226200612.2062-2-mhklinux@outlook.com>
When a Hyper-V framebuffer device is unbind, hyperv_fb driver tries to
release the framebuffer forcefully. If this framebuffer is in use it
produce the following WARN and hence this framebuffer is never released.
[ 44.111220] WARNING: CPU: 35 PID: 1882 at drivers/video/fbdev/core/fb_info.c:70 framebuffer_release+0x2c/0x40
< snip >
[ 44.111289] Call Trace:
[ 44.111290] <TASK>
[ 44.111291] ? show_regs+0x6c/0x80
[ 44.111295] ? __warn+0x8d/0x150
[ 44.111298] ? framebuffer_release+0x2c/0x40
[ 44.111300] ? report_bug+0x182/0x1b0
[ 44.111303] ? handle_bug+0x6e/0xb0
[ 44.111306] ? exc_invalid_op+0x18/0x80
[ 44.111308] ? asm_exc_invalid_op+0x1b/0x20
[ 44.111311] ? framebuffer_release+0x2c/0x40
[ 44.111313] ? hvfb_remove+0x86/0xa0 [hyperv_fb]
[ 44.111315] vmbus_remove+0x24/0x40 [hv_vmbus]
[ 44.111323] device_remove+0x40/0x80
[ 44.111325] device_release_driver_internal+0x20b/0x270
[ 44.111327] ? bus_find_device+0xb3/0xf0
Fix this by moving the release of framebuffer and assosiated memory
to fb_ops.fb_destroy function, so that framebuffer framework handles
it gracefully.
While we fix this, also replace manual registrations/unregistration of
framebuffer with devm_register_framebuffer.
Fixes: 68a2d20b79 ("drivers/video: add Hyper-V Synthetic Video Frame Buffer Driver")
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1740845791-19977-3-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1740845791-19977-3-git-send-email-ssengar@linux.microsoft.com>
The device object required in 'hvfb_release_phymem' function
for 'dma_free_coherent' can also be obtained from the 'info'
pointer, making 'hdev' parameter in 'hvfb_putmem' redundant.
Remove the unnecessary 'hdev' argument from 'hvfb_putmem'.
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1740845791-19977-2-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1740845791-19977-2-git-send-email-ssengar@linux.microsoft.com>
Gen 2 Hyper-V VMs boot via EFI and have a standard EFI framebuffer
device. When the kdump kernel runs in such a VM, loading the efifb
driver may hang because of accessing the framebuffer at the wrong
memory address.
The scenario occurs when the hyperv_fb driver in the original kernel
moves the framebuffer to a different MMIO address because of conflicts
with an already-running efifb or simplefb driver. The hyperv_fb driver
then informs Hyper-V of the change, which is allowed by the Hyper-V FB
VMBus device protocol. However, when the kexec command loads the kdump
kernel into crash memory via the kexec_file_load() system call, the
system call doesn't know the framebuffer has moved, and it sets up the
kdump screen_info using the original framebuffer address. The transition
to the kdump kernel does not go through the Hyper-V host, so Hyper-V
does not reset the framebuffer address like it would do on a reboot.
When efifb tries to run, it accesses a non-existent framebuffer
address, which traps to the Hyper-V host. After many such accesses,
the Hyper-V host thinks the guest is being malicious, and throttles
the guest to the point that it runs very slowly or appears to have hung.
When the kdump kernel is loaded into crash memory via the kexec_load()
system call, the problem does not occur. In this case, the kexec command
builds the screen_info table itself in user space from data returned
by the FBIOGET_FSCREENINFO ioctl against /dev/fb0, which gives it the
new framebuffer location.
This problem was originally reported in 2020 [1], resulting in commit
3cb73bc3fa ("hyperv_fb: Update screen_info after removing old
framebuffer"). This commit solved the problem by setting orig_video_isVGA
to 0, so the kdump kernel was unaware of the EFI framebuffer. The efifb
driver did not try to load, and no hang occurred. But in 2024, commit
c25a19afb8 ("fbdev/hyperv_fb: Do not clear global screen_info")
effectively reverted 3cb73bc3fa. Commit c25a19afb8 has no reference
to 3cb73bc3fa, so perhaps it was done without knowing the implications
that were reported with 3cb73bc3fa. In any case, as of commit
c25a19afb8, the original problem came back again.
Interestingly, the hyperv_drm driver does not have this problem because
it never moves the framebuffer. The difference is that the hyperv_drm
driver removes any conflicting framebuffers *before* allocating an MMIO
address, while the hyperv_fb drivers removes conflicting framebuffers
*after* allocating an MMIO address. With the "after" ordering, hyperv_fb
may encounter a conflict and move the framebuffer to a different MMIO
address. But the conflict is essentially bogus because it is removed
a few lines of code later.
Rather than fix the problem with the approach from 2020 in commit
3cb73bc3fa, instead slightly reorder the steps in hyperv_fb so
conflicting framebuffers are removed before allocating an MMIO address.
Then the default framebuffer MMIO address should always be available, and
there's never any confusion about which framebuffer address the kdump
kernel should use -- it's always the original address provided by
the Hyper-V host. This approach is already used by the hyperv_drm
driver, and is consistent with the usage guidelines at the head of
the module with the function aperture_remove_conflicting_devices().
This approach also solves a related minor problem when kexec_load()
is used to load the kdump kernel. With current code, unbinding and
rebinding the hyperv_fb driver could result in the framebuffer moving
back to the default framebuffer address, because on the rebind there
are no conflicts. If such a move is done after the kdump kernel is
loaded with the new framebuffer address, at kdump time it could again
have the wrong address.
This problem and fix are described in terms of the kdump kernel, but
it can also occur with any kernel started via kexec.
See extensive discussion of the problem and solution at [2].
[1] https://lore.kernel.org/linux-hyperv/20201014092429.1415040-1-kasong@redhat.com/
[2] https://lore.kernel.org/linux-hyperv/BLAPR10MB521793485093FDB448F7B2E5FDE92@BLAPR10MB5217.namprd10.prod.outlook.com/
Reported-by: Thomas Tai <thomas.tai@oracle.com>
Fixes: c25a19afb8 ("fbdev/hyperv_fb: Do not clear global screen_info")
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20250218230130.3207-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250218230130.3207-1-mhklinux@outlook.com>
When a Hyper-V DRM device is probed, the driver allocates MMIO space for
the vram, and maps it cacheable. If the device removed, or in the error
path for device probing, the MMIO space is released but no unmap is done.
Consequently the kernel address space for the mapping is leaked.
Fix this by adding iounmap() calls in the device removal path, and in the
error path during device probing.
Fixes: f1f63cbb70 ("drm/hyperv: Fix an error handling path in hyperv_vmbus_probe()")
Fixes: a0ab5abced ("drm/hyperv : Removing the restruction of VRAM allocation with PCI bar size")
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Tested-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250210193441.2414-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250210193441.2414-1-mhklinux@outlook.com>
- Use the specified $(LD) when building userprogs with Clang
- Pass the correct target triple when compile-testing UAPI headers
with Clang
- Fix pacman-pkg build error with KBUILD_OUTPUT
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Merge tag 'kbuild-fixes-v6.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Use the specified $(LD) when building userprogs with Clang
- Pass the correct target triple when compile-testing UAPI headers
with Clang
- Fix pacman-pkg build error with KBUILD_OUTPUT
* tag 'kbuild-fixes-v6.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: install-extmod-build: Fix build when specifying KBUILD_OUTPUT
docs: Kconfig: fix defconfig description
kbuild: hdrcheck: fix cross build with clang
kbuild: userprogs: use correct lld when linking through clang
Here are some small USB driver fixes for some reported issues for
6.14-rc6. These contain:
- typec driver fixes
- dwc3 driver fixes
- xhci driver fixes
- renesas controller fixes
- gadget driver fixes
- a new USB quirk added
All of these have been in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are some small USB driver fixes for some reported issues. These
contain:
- typec driver fixes
- dwc3 driver fixes
- xhci driver fixes
- renesas controller fixes
- gadget driver fixes
- a new USB quirk added
All of these have been in linux-next with no reported issues"
* tag 'usb-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
usb: typec: ucsi: Fix NULL pointer access
usb: quirks: Add DELAY_INIT and NO_LPM for Prolific Mass Storage Card Reader
usb: xhci: Fix host controllers "dying" after suspend and resume
usb: dwc3: Set SUSPENDENABLE soon after phy init
usb: hub: lack of clearing xHC resources
usb: renesas_usbhs: Flush the notify_hotplug_work
usb: renesas_usbhs: Use devm_usb_get_phy()
usb: renesas_usbhs: Call clk_put()
usb: dwc3: gadget: Prevent irq storm when TH re-executes
usb: gadget: Check bmAttributes only if configuration is valid
xhci: Restrict USB4 tunnel detection for USB3 devices to Intel hosts
usb: xhci: Enable the TRB overfetch quirk on VIA VL805
usb: gadget: Fix setting self-powered state on suspend
usb: typec: ucsi: increase timeout for PPM reset operations
acpi: typec: ucsi: Introduce a ->poll_cci method
usb: typec: tcpci_rt1711h: Unmask alert interrupts to fix functionality
usb: gadget: Set self-powered based on MaxPower and bmAttributes
usb: gadget: u_ether: Set is_suspend flag if remote wakeup fails
usb: atm: cxacru: fix a flaw in existing endpoint checks
Here is a single driver core fix that resolves a reported memory leak.
It's been in linux-next for 2 weeks now with no reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fix from Greg KH:
"Here is a single driver core fix that resolves a reported memory leak.
It's been in linux-next for 2 weeks now with no reported problems"
* tag 'driver-core-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
drivers: core: fix device leak in __fw_devlink_relax_cycles()
Here are a number of misc and char and iio driver fixes that have been
sitting in my tree for way too long, and should be merged for 6.14-rc6.
They contain:
- iio driver fixes for reported issues
- regression fix for rtsx_usb card reader
- mei and mhi driver fixes
- small virt driver fixes
- ntsync permissions fix
- other tiny driver fixes for reported problems.
All of these have been in linux-next for quite a while with no reported
issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc/IIO driver fixes from Greg KH:
"Here are a number of misc and char and iio driver fixes that have been
sitting in my tree for way too long. They contain:
- iio driver fixes for reported issues
- regression fix for rtsx_usb card reader
- mei and mhi driver fixes
- small virt driver fixes
- ntsync permissions fix
- other tiny driver fixes for reported problems.
All of these have been in linux-next for quite a while with no
reported issues"
* tag 'char-misc-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (30 commits)
Revert "drivers/card_reader/rtsx_usb: Restore interrupt based detection"
ntsync: Check wait count based on byte size.
bus: simple-pm-bus: fix forced runtime PM use
char: misc: deallocate static minor in error path
eeprom: digsy_mtc: Make GPIO lookup table match the device
drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl
binderfs: fix use-after-free in binder_devices
slimbus: messaging: Free transaction ID in delayed interrupt scenario
vbox: add HAS_IOPORT dependency
cdx: Fix possible UAF error in driver_override_show()
intel_th: pci: Add Panther Lake-P/U support
intel_th: pci: Add Panther Lake-H support
intel_th: pci: Add Arrow Lake support
intel_th: msu: Fix less trivial kernel-doc warnings
intel_th: msu: Fix kernel-doc warnings
MAINTAINERS: change maintainer for FSI
ntsync: Set the permissions to be 0666
bus: mhi: host: pci_generic: Use pci_try_reset_function() to avoid deadlock
mei: vsc: Use "wakeuphostint" when getting the host wakeup GPIO
mei: me: add panther lake P DID
...
* Fix a couple of bugs affecting pKVM's PSCI relay implementation
when running in the hVHE mode, resulting in the host being entered
with the MMU in an unknown state, and EL2 being in the wrong mode.
x86:
* Set RFLAGS.IF in C code on SVM to get VMRUN out of the STI shadow.
* Ensure DEBUGCTL is context switched on AMD to avoid running the guest with
the host's value, which can lead to unexpected bus lock #DBs.
* Suppress DEBUGCTL.BTF on AMD (to match Intel), as KVM doesn't properly
emulate BTF. KVM's lack of context switching has meant BTF has always been
broken to some extent.
* Always save DR masks for SNP vCPUs if DebugSwap is *supported*, as the guest
can enable DebugSwap without KVM's knowledge.
* Fix a bug in mmu_stress_tests where a vCPU could finish the "writes to RO
memory" phase without actually generating a write-protection fault.
* Fix a printf() goof in the SEV smoke test that causes build failures with
-Werror.
* Explicitly zero EAX and EBX in CPUID.0x8000_0022 output when PERFMON_V2
isn't supported by KVM.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Paolo Bonzini:
"arm64:
- Fix a couple of bugs affecting pKVM's PSCI relay implementation
when running in the hVHE mode, resulting in the host being entered
with the MMU in an unknown state, and EL2 being in the wrong mode
x86:
- Set RFLAGS.IF in C code on SVM to get VMRUN out of the STI shadow
- Ensure DEBUGCTL is context switched on AMD to avoid running the
guest with the host's value, which can lead to unexpected bus lock
#DBs
- Suppress DEBUGCTL.BTF on AMD (to match Intel), as KVM doesn't
properly emulate BTF. KVM's lack of context switching has meant BTF
has always been broken to some extent
- Always save DR masks for SNP vCPUs if DebugSwap is *supported*, as
the guest can enable DebugSwap without KVM's knowledge
- Fix a bug in mmu_stress_tests where a vCPU could finish the "writes
to RO memory" phase without actually generating a write-protection
fault
- Fix a printf() goof in the SEV smoke test that causes build
failures with -Werror
- Explicitly zero EAX and EBX in CPUID.0x8000_0022 output when
PERFMON_V2 isn't supported by KVM"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: Explicitly zero EAX and EBX when PERFMON_V2 isn't supported by KVM
KVM: selftests: Fix printf() format goof in SEV smoke test
KVM: selftests: Ensure all vCPUs hit -EFAULT during initial RO stage
KVM: SVM: Don't rely on DebugSwap to restore host DR0..DR3
KVM: SVM: Save host DR masks on CPUs with DebugSwap
KVM: arm64: Initialize SCTLR_EL1 in __kvm_hyp_init_cpu()
KVM: arm64: Initialize HCR_EL2.E2H early
KVM: x86: Snapshot the host's DEBUGCTL after disabling IRQs
KVM: SVM: Manually context switch DEBUGCTL if LBR virtualization is disabled
KVM: x86: Snapshot the host's DEBUGCTL in common x86
KVM: SVM: Suppress DEBUGCTL.BTF on AMD
KVM: SVM: Drop DEBUGCTL[5:2] from guest's effective value
KVM: selftests: Assert that STI blocking isn't set after event injection
KVM: SVM: Set RFLAGS.IF=1 in C code, to get VMRUN out of the STI shadow
- Set RFLAGS.IF in C code on SVM to get VMRUN out of the STI shadow.
- Ensure DEBUGCTL is context switched on AMD to avoid running the guest with
the host's value, which can lead to unexpected bus lock #DBs.
- Suppress DEBUGCTL.BTF on AMD (to match Intel), as KVM doesn't properly
emulate BTF. KVM's lack of context switching has meant BTF has always been
broken to some extent.
- Always save DR masks for SNP vCPUs if DebugSwap is *supported*, as the guest
can enable DebugSwap without KVM's knowledge.
- Fix a bug in mmu_stress_tests where a vCPU could finish the "writes to RO
memory" phase without actually generating a write-protection fault.
- Fix a printf() goof in the SEV smoke test that causes build failures with
-Werror.
- Explicitly zero EAX and EBX in CPUID.0x8000_0022 output when PERFMON_V2
isn't supported by KVM.
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Merge tag 'kvm-x86-fixes-6.14-rcN.2' of https://github.com/kvm-x86/linux into HEAD
KVM x86 fixes for 6.14-rcN #2
- Set RFLAGS.IF in C code on SVM to get VMRUN out of the STI shadow.
- Ensure DEBUGCTL is context switched on AMD to avoid running the guest with
the host's value, which can lead to unexpected bus lock #DBs.
- Suppress DEBUGCTL.BTF on AMD (to match Intel), as KVM doesn't properly
emulate BTF. KVM's lack of context switching has meant BTF has always been
broken to some extent.
- Always save DR masks for SNP vCPUs if DebugSwap is *supported*, as the guest
can enable DebugSwap without KVM's knowledge.
- Fix a bug in mmu_stress_tests where a vCPU could finish the "writes to RO
memory" phase without actually generating a write-protection fault.
- Fix a printf() goof in the SEV smoke test that causes build failures with
-Werror.
- Explicitly zero EAX and EBX in CPUID.0x8000_0022 output when PERFMON_V2
isn't supported by KVM.
- Fix a couple of bugs affecting pKVM's PSCI relay implementation
when running in the hVHE mode, resulting in the host being entered
with the MMU in an unknown state, and EL2 being in the wrong mode.
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Merge tag 'kvmarm-fixes-6.14-4' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm64 fixes for 6.14, take #4
- Fix a couple of bugs affecting pKVM's PSCI relay implementation
when running in the hVHE mode, resulting in the host being entered
with the MMU in an unknown state, and EL2 being in the wrong mode.
or aren't considered necessary for -stable kernels.
26 are for MM and 7 are for non-MM.
- "mm: memory_failure: unmap poisoned folio during migrate properly"
from Ma Wupeng fixes a couple of two year old bugs involving the
migration of hwpoisoned folios.
- "selftests/damon: three fixes for false results" from SeongJae Park
fixes three one year old bugs in the SAMON selftest code.
The remainder are singletons and doubletons. Please see the individual
changelogs for details.
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Merge tag 'mm-hotfixes-stable-2025-03-08-16-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"33 hotfixes. 24 are cc:stable and the remainder address post-6.13
issues or aren't considered necessary for -stable kernels.
26 are for MM and 7 are for non-MM.
- "mm: memory_failure: unmap poisoned folio during migrate properly"
from Ma Wupeng fixes a couple of two year old bugs involving the
migration of hwpoisoned folios.
- "selftests/damon: three fixes for false results" from SeongJae Park
fixes three one year old bugs in the SAMON selftest code.
The remainder are singletons and doubletons. Please see the individual
changelogs for details"
* tag 'mm-hotfixes-stable-2025-03-08-16-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (33 commits)
mm/page_alloc: fix uninitialized variable
rapidio: add check for rio_add_net() in rio_scan_alloc_net()
rapidio: fix an API misues when rio_add_net() fails
MAINTAINERS: .mailmap: update Sumit Garg's email address
Revert "mm/page_alloc.c: don't show protection in zone's ->lowmem_reserve[] for empty zone"
mm: fix finish_fault() handling for large folios
mm: don't skip arch_sync_kernel_mappings() in error paths
mm: shmem: remove unnecessary warning in shmem_writepage()
userfaultfd: fix PTE unmapping stack-allocated PTE copies
userfaultfd: do not block on locking a large folio with raised refcount
mm: zswap: use ATOMIC_LONG_INIT to initialize zswap_stored_pages
mm: shmem: fix potential data corruption during shmem swapin
mm: fix kernel BUG when userfaultfd_move encounters swapcache
selftests/damon/damon_nr_regions: sort collected regiosn before checking with min/max boundaries
selftests/damon/damon_nr_regions: set ops update for merge results check to 100ms
selftests/damon/damos_quota: make real expectation of quota exceeds
include/linux/log2.h: mark is_power_of_2() with __always_inline
NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback
mm, swap: avoid BUG_ON in relocate_cluster()
mm: swap: use correct step in loop to wait all clusters in wait_for_allocation()
...
- Add more model IDs to the AMD microcode version check,
more people are hitting these checks
- Fix a Xen guest boot warning related to AMD northbridge
setup
- Fix SEV guest bugs related to a recent changes in its
locking logic
- Fix a missing definition of PTRS_PER_PMD that assembly
builds can hit
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2025-03-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull more x86 fixes from Ingo Molnar:
- Add more model IDs to the AMD microcode version check, more people
are hitting these checks
- Fix a Xen guest boot warning related to AMD northbridge setup
- Fix SEV guest bugs related to a recent changes in its locking logic
- Fix a missing definition of PTRS_PER_PMD that assembly builds can hit
* tag 'x86-urgent-2025-03-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/AMD: Add some forgotten models to the SHA check
x86/mm: Define PTRS_PER_PMD for assembly code too
virt: sev-guest: Move SNP Guest Request data pages handling under snp_cmd_mutex
virt: sev-guest: Allocate request data dynamically
x86/amd_nb: Use rdmsr_safe() in amd_get_mmconfig_range()
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Merge tag 'loongarch-fixes-6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch fixes from Huacai Chen:
"Fix bugs in kernel build, hibernation, memory management and KVM"
* tag 'loongarch-fixes-6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
LoongArch: KVM: Fix GPA size issue about VM
LoongArch: KVM: Reload guest CSR registers after sleep
LoongArch: KVM: Add interrupt checking for AVEC
LoongArch: Set hugetlb mmap base address aligned with pmd size
LoongArch: Set max_pfn with the PFN of the last page
LoongArch: Use polling play_dead() when resuming from hibernation
LoongArch: Eliminate superfluous get_numa_distances_cnt()
LoongArch: Convert unreachable() to BUG()
Physical address space is 48 bit on Loongson-3A5000 physical machine,
however it is 47 bit for VM on Loongson-3A5000 system. Size of physical
address space of VM is the same with the size of virtual user space (a
half) of physical machine.
Variable cpu_vabits represents user address space, kernel address space
is not included (user space and kernel space are both a half of total).
Here cpu_vabits, rather than cpu_vabits - 1, is to represent the size of
guest physical address space.
Also there is strict checking about page fault GPA address, inject error
if it is larger than maximum GPA address of VM.
Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
On host, the HW guest CSR registers are lost after suspend and resume
operation. Since last_vcpu of boot CPU still records latest vCPU pointer
so that the guest CSR register skips to reload when boot CPU resumes and
vCPU is scheduled.
Here last_vcpu is cleared so that guest CSR registers will reload from
scheduled vCPU context after suspend and resume.
Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
There is a newly added macro INT_AVEC with CSR ESTAT register, which is
bit 14 used for LoongArch AVEC support. AVEC interrupt status bit 14 is
supported with macro CSR_ESTAT_IS, so here replace the hard-coded value
0x1fff with macro CSR_ESTAT_IS so that the AVEC interrupt status is also
supported by KVM.
Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
The current max_pfn equals to zero. In this case, it causes user cannot
get some page information through /proc filesystem such as kpagecount.
The following message is displayed by stress-ng test suite with command
"stress-ng --verbose --physpage 1 -t 1".
# stress-ng --verbose --physpage 1 -t 1
stress-ng: error: [1691] physpage: cannot read page count for address 0x134ac000 in /proc/kpagecount, errno=22 (Invalid argument)
stress-ng: error: [1691] physpage: cannot read page count for address 0x7ffff207c3a8 in /proc/kpagecount, errno=22 (Invalid argument)
stress-ng: error: [1691] physpage: cannot read page count for address 0x134b0000 in /proc/kpagecount, errno=22 (Invalid argument)
...
After applying this patch, the kernel can pass the test.
# stress-ng --verbose --physpage 1 -t 1
stress-ng: debug: [1701] physpage: [1701] started (instance 0 on CPU 3)
stress-ng: debug: [1701] physpage: [1701] exited (instance 0 on CPU 3)
stress-ng: debug: [1700] physpage: [1701] terminated (success)
Cc: stable@vger.kernel.org # 6.8+
Fixes: ff6c3d81f2 ("NUMA: optimize detection of memory with no node id assigned by firmware")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
When CONFIG_RANDOM_KMALLOC_CACHES or other randomization infrastructrue
enabled, the idle_task's stack may different between the booting kernel
and target kernel. So when resuming from hibernation, an ACTION_BOOT_CPU
IPI wakeup the idle instruction in arch_cpu_idle_dead() and jump to the
interrupt handler. But since the stack pointer is changed, the interrupt
handler cannot restore correct context.
So rename the current arch_cpu_idle_dead() to idle_play_dead(), make it
as the default version of play_dead(), and the new arch_cpu_idle_dead()
call play_dead() directly. For hibernation, implement an arch-specific
hibernate_resume_nonboot_cpu_disable() to use the polling version (idle
instruction is replace by nop, and irq is disabled) of play_dead(), i.e.
poll_play_dead(), to avoid IPI handler corrupting the idle_task's stack
when resuming from hibernation.
This solution is a little similar to commit 406f992e4a ("x86 /
hibernate: Use hlt_play_dead() when resuming from hibernation").
Cc: stable@vger.kernel.org
Tested-by: Erpeng Xu <xuerpeng@uniontech.com>
Tested-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
When compiling on LoongArch, there exists the following objtool warning
in arch/loongarch/kernel/machine_kexec.o:
kexec_reboot() falls through to next function crash_shutdown_secondary()
Avoid using unreachable() as it can (and will in the absence of UBSAN)
generate fall-through code. Use BUG() so we get a "break BRK_BUG" trap
(with unreachable annotation).
Cc: stable@vger.kernel.org # 6.12+
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
- Fix return address recovery of traced function in ftrace to ensure
reliable stack unwinding
- Fix compiler warnings and runtime crashes of vDSO selftests on s390 by
introducing a dedicated GNU hash bucket pointer with correct 32-bit
entry size
- Fix test_monitor_call() inline asm, which misses CC clobber, by
switching to an instruction that doesn't modify CC
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Merge tag 's390-6.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Vasily Gorbik:
- Fix return address recovery of traced function in ftrace to ensure
reliable stack unwinding
- Fix compiler warnings and runtime crashes of vDSO selftests on s390
by introducing a dedicated GNU hash bucket pointer with correct
32-bit entry size
- Fix test_monitor_call() inline asm, which misses CC clobber, by
switching to an instruction that doesn't modify CC
* tag 's390-6.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/ftrace: Fix return address recovery of traced function
selftests/vDSO: Fix GNU hash table entry size for s390x
s390/traps: Fix test_monitor_call() inline assembly
Andy reported the following build warning from head_32.S:
In file included from arch/x86/kernel/head_32.S:29:
arch/x86/include/asm/pgtable_32.h:59:5: error: "PTRS_PER_PMD" is not defined, evaluates to 0 [-Werror=undef]
59 | #if PTRS_PER_PMD > 1
The reason is that on 2-level i386 paging the folded in PMD's
PTRS_PER_PMD constant is not defined in assembly headers,
only in generic MM C headers.
Instead of trying to fish out the definition from the generic
headers, just define it - it even has a comment for it already...
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/Z8oa8AUVyi2HWfo9@gmail.com
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Merge tag 'slab-for-6.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab
Pull slab fix from Vlastimil Babka:
- Stable fix for kmem_cache_destroy() called from a WQ_MEM_RECLAIM
workqueue causing a warning due to the new kvfree_rcu_barrier()
(Uladzislau Rezki)
* tag 'slab-for-6.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
mm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq
Restore the previous behavior of the ACPI platform_profile sysfs
interface that has been changed recently in a way incompatible
with the existing user space (Mario Limonciello).
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Merge tag 'acpi-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fix from Rafael Wysocki:
"Restore the previous behavior of the ACPI platform_profile sysfs
interface that has been changed recently in a way incompatible with
the existing user space (Mario Limonciello)"
* tag 'acpi-6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
platform/x86/amd: pmf: Add balanced-performance to hidden choices
platform/x86/amd: pmf: Add 'quiet' to hidden choices
ACPI: platform_profile: Add support for hidden choices
- coredump: Only sort VMAs when core_sort_vma sysctl is set
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Merge tag 'execve-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull core dumping fix from Kees Cook:
- Only sort VMAs when core_sort_vma sysctl is set
* tag 'execve-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
coredump: Only sort VMAs when core_sort_vma sysctl is set
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Merge tag 'for-6.14-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
- fix leaked extent map after error when reading chunks
- replace use of deprecated strncpy
- in zoned mode, fixed range when ulocking extent range, causing a hang
* tag 'for-6.14-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix a leaked chunk map issue in read_one_chunk()
btrfs: replace deprecated strncpy() with strscpy()
btrfs: zoned: fix extent range end unlock in cow_file_range()
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Merge tag 'block-6.14-20250306' of git://git.kernel.dk/linux
Pull block fixes from Jens Axboe:
- NVMe pull request via Keith:
- TCP use after free fix on polling (Sagi)
- Controller memory buffer cleanup fixes (Icenowy)
- Free leaking requests on bad user passthrough commands (Keith)
- TCP error message fix (Maurizio)
- TCP corruption fix on partial PDU (Maurizio)
- TCP memory ordering fix for weakly ordered archs (Meir)
- Type coercion fix on message error for TCP (Dan)
- Name the RQF flags enum, fixing issues with anon enums and BPF import
of it
- ublk parameter setting fix
- GPT partition 7-bit conversion fix
* tag 'block-6.14-20250306' of git://git.kernel.dk/linux:
block: Name the RQF flags enum
nvme-tcp: fix signedness bug in nvme_tcp_init_connection()
block: fix conversion of GPT partition name to 7-bit
ublk: set_params: properly check if parameters can be applied
nvmet-tcp: Fix a possible sporadic response drops in weakly ordered arch
nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu()
nvme-tcp: Fix a C2HTermReq error message
nvmet: remove old function prototype
nvme-ioctl: fix leaked requests on mapping error
nvme-pci: skip CMB blocks incompatible with PCI P2P DMA
nvme-pci: clean up CMBMSC when registering CMB fails
nvme-tcp: fix possible UAF in nvme_tcp_poll
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Merge tag 'io_uring-6.14-20250306' of git://git.kernel.dk/linux
Pull io_uring fix from Jens Axboe:
"A single fix for a regression introduced in the 6.14 merge window,
causing stalls/hangs with IOPOLL reads or writes"
* tag 'io_uring-6.14-20250306' of git://git.kernel.dk/linux:
io_uring/rw: ensure reissue path is correctly handled for IOPOLL
- xgene-hwmon: Fix a NULL vs IS_ERR_OR_NULL() check
- ad7314: Return error if leading zero bits are non-zero
- ntc_thermistor: Update/fix the ncpXXxh103 sensor table
- pmbus: Initialise page count in pmbus_identify()
- peci/dimmtemp: Di not provide fake threshold data
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Merge tag 'hwmon-for-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon fixes from Guenter Roeck:
- xgene-hwmon: Fix a NULL vs IS_ERR_OR_NULL() check
- ad7314: Return error if leading zero bits are non-zero
- ntc_thermistor: Update/fix the ncpXXxh103 sensor table
- pmbus: Initialise page count in pmbus_identify()
- peci/dimmtemp: Do not provide fake threshold data
* tag 'hwmon-for-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: fix a NULL vs IS_ERR_OR_NULL() check in xgene_hwmon_probe()
hwmon: (ad7314) Validate leading zero bits and return error
hwmon: (ntc_thermistor) Fix the ncpXXxh103 sensor table
hwmon: (pmbus) Initialise page count in pmbus_identify()
hwmon: (peci/dimmtemp) Do not provide fake thresholds data
- protect gpio-aggregator against module unload
- use raw spinlock in gpio-rcar to fix a lockdep splat
- fix OF node leak in gpio-rcar
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Merge tag 'gpio-fixes-for-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- protect gpio-aggregator against module unload
- use raw spinlock in gpio-rcar to fix a lockdep splat
- fix OF node leak in gpio-rcar
* tag 'gpio-fixes-for-v6.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: rcar: Fix missing of_node_put() call
gpio: rcar: Use raw_spinlock to protect register access
gpio: aggregator: protect driver attr handlers against module unload
