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Mark Salter b2fc0a13f9 drivers/perf: xgene_pmu: Fix uninitialized resource struct [ Upstream commit `a76b8236ed` ] This splat was reported on newer Fedora kernels booting on certain X-gene based machines: xgene-pmu APMC0D83:00: X-Gene PMU version 3 Unable to handle kernel read from unreadable memory at virtual \ address 0000000000004006 ... Call trace: string+0x50/0x100 vsnprintf+0x160/0x750 devm_kvasprintf+0x5c/0xb4 devm_kasprintf+0x54/0x60 __devm_ioremap_resource+0xdc/0x1a0 devm_ioremap_resource+0x14/0x20 acpi_get_pmu_hw_inf.isra.0+0x84/0x15c acpi_pmu_dev_add+0xbc/0x21c acpi_ns_walk_namespace+0x16c/0x1e4 acpi_walk_namespace+0xb4/0xfc xgene_pmu_probe_pmu_dev+0x7c/0xe0 xgene_pmu_probe.part.0+0x2c0/0x310 xgene_pmu_probe+0x54/0x64 platform_drv_probe+0x60/0xb4 really_probe+0xe8/0x4a0 driver_probe_device+0xe4/0x100 device_driver_attach+0xcc/0xd4 __driver_attach+0xb0/0x17c bus_for_each_dev+0x6c/0xb0 driver_attach+0x30/0x40 bus_add_driver+0x154/0x250 driver_register+0x84/0x140 __platform_driver_register+0x54/0x60 xgene_pmu_driver_init+0x28/0x34 do_one_initcall+0x40/0x204 do_initcalls+0x104/0x144 kernel_init_freeable+0x198/0x210 kernel_init+0x20/0x12c ret_from_fork+0x10/0x18 Code: 91000400 110004e1 eb08009f 540000c0 (38646846) ---[ end trace f08c10566496a703 ]--- This is due to use of an uninitialized local resource struct in the xgene pmu driver. The thunderx2_pmu driver avoids this by using the resource list constructed by acpi_dev_get_resources() rather than using a callback from that function. The callback in the xgene driver didn't fully initialize the resource. So get rid of the callback and search the resource list as done by thunderx2. Fixes: `832c927d11` ("perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver") Signed-off-by: Mark Salter <msalter@redhat.com> Link: https://lore.kernel.org/r/20200915204110.326138-1-msalter@redhat.com Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-10-29 09:55:00 +01:00
arch	x86/fpu: Allow multiple bits in clearcpuid= parameter	2020-10-29 09:55:00 +01:00
block	block: ensure bdi->io_pages is always initialized	2020-09-12 13:40:22 +02:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: algif_aead - Do not set MAY_BACKLOG on the async path	2020-10-29 09:54:59 +01:00
Documentation	x86/fpu: Allow multiple bits in clearcpuid= parameter	2020-10-29 09:55:00 +01:00
drivers	drivers/perf: xgene_pmu: Fix uninitialized resource struct	2020-10-29 09:55:00 +01:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:21:29 +01:00
fs	cifs: Return the error from crypt_message when enc/dec key not found.	2020-10-29 09:54:59 +01:00
include	net/ipv4: always honour route mtu during forwarding	2020-10-29 09:54:56 +01:00
init	printk: queue wake_up_klogd irq_work only if per-CPU areas are ready	2020-07-22 09:32:13 +02:00
ipc	ipc/util.c: sysvipc_find_ipc() incorrectly updates position index	2020-05-20 08:18:40 +02:00
kernel	perf: Fix task_function_call() error handling	2020-10-14 10:31:26 +02:00
lib	Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts	2020-10-14 10:31:21 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm: khugepaged: recalculate min_free_kbytes after memory hotplug as expected by khugepaged	2020-10-14 10:31:26 +02:00
net	icmp: randomize the global rate limiter	2020-10-29 09:54:58 +01:00
samples	samples: bpf: Fix build error	2020-06-03 08:19:31 +02:00
scripts	checkpatch: fix the usage of capture group ( ... )	2020-09-09 19:04:32 +02:00
security	ima: Don't ignore errors from crypto_shash_update()	2020-10-29 09:54:59 +01:00
sound	ALSA: hda/realtek: Enable audio jacks of ASUS D700SA with ALC887	2020-10-29 09:54:58 +01:00
tools	perf cs-etm: Move definition of 'traceid_list' global variable from header file	2020-10-17 10:12:56 +02:00
usr	initramfs: restore default compression behavior	2020-04-13 10:44:59 +02:00
virt	KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch	2020-10-01 13:14:54 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	Documentation/llvm: add documentation on building w/ Clang/LLVM	2020-09-26 18:01:31 +02:00
Makefile	Linux 4.19.152	2020-10-17 10:12:58 +02:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.