Christophe Leroy 67baac10dd powerpc/fixmap: Fix VM debug warning on unmap ... [ Upstream commit aec982603a ] Unmapping a fixmap entry is done by calling __set_fixmap() with FIXMAP_PAGE_CLEAR as flags. Today, powerpc __set_fixmap() calls map_kernel_page(). map_kernel_page() is not happy when called a second time for the same page. WARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8 CPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682 NIP: c0017cd4 LR: c00187f0 CTR: 00000010 REGS: e1011d50 TRAP: 0700 Not tainted (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) MSR: 00029032 <EE,ME,IR,DR,RI> CR: 42000208 XER: 00000000 GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c GPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 NIP [c0017cd4] set_pte_at+0xc/0x1e8 LR [c00187f0] map_kernel_page+0x9c/0x100 Call Trace: [e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable) [e1011e30] [c0165fec] __set_fixmap+0x30/0x44 [e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170 [e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0 [e1011e90] [c0c03634] do_one_initcall+0x80/0x178 [e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250 [e1011f20] [c0007e34] kernel_init+0x24/0x140 [e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64 Instruction dump: 7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 4e800020 81250000 712a0001 41820008 <0fe00000> 9421ffe0 93e1001c 48000030 Implement unmap_kernel_page() which clears an existing pte. Reported-by: Maxime Bizon <mbizon@freebox.fr> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Tested-by: Maxime Bizon <mbizon@freebox.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b0b752f6f6ecc60653e873f385c6f0dce4e9ab6a.1638789098.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-02-16 12:54:19 +01:00
..
alpha	alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile	2021-09-30 10:11:07 +02:00
arc	ARC: export clear_user_page() for modules	2021-09-22 12:28:04 +02:00
arm	ARM: imx: rename DEBUG_IMX21_IMX27_UART to DEBUG_IMX27_UART	2022-01-27 10:54:11 +01:00
arm64	arm64: errata: Fix exec handling in erratum 1418040 workaround	2022-02-01 17:25:40 +01:00
c6x	arch-cleanup-2020-10-22	2020-10-23 10:06:38 -07:00
csky	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
h8300	h8300: fix PREEMPTION build, TI_PRE_COUNT undefined	2021-02-17 11:02:28 +01:00
hexagon	hexagon: clean up timer-regs.h	2021-11-26 10:39:19 +01:00
ia64	ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK	2021-11-18 14:03:55 +01:00
m68k	m68k: set a default value for MEMORY_RESERVE	2021-11-18 14:04:24 +01:00
microblaze	local64.h: make <asm/local64.h> mandatory	2021-01-12 20:18:16 +01:00
mips	MIPS: Octeon: Fix build errors using clang	2022-01-27 10:54:23 +01:00
nds32	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
nios2	nios2: Make NIOS2_DTB_SOURCE_BOOL depend on !COMPILE_TEST	2021-11-02 19:48:23 +01:00
openrisc	openrisc: Add clone3 ABI wrapper	2022-01-27 10:54:06 +01:00
parisc	parisc: Fix lpa and lpa_user defines	2022-01-27 10:54:26 +01:00
powerpc	powerpc/fixmap: Fix VM debug warning on unmap	2022-02-16 12:54:19 +01:00
riscv	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
s390	KVM: s390: Return error on SIDA memop on normal guest	2022-02-11 09:09:03 +01:00
sh	sh: define __BIG_ENDIAN for math-emu	2021-11-26 10:39:12 +01:00
sparc	sparc64: fix pci_iounmap() when CONFIG_PCI is not set	2021-10-09 14:40:56 +02:00
um	um: registers: Rename function names to avoid conflicts and build problems	2022-01-27 10:54:18 +01:00
x86	x86/perf: Avoid warning for Arch LBR without XSAVE	2022-02-16 12:54:18 +01:00
xtensa	xtensa: xtfpga: Try software restart before simulating CPU reset	2021-10-27 09:56:47 +02:00
.gitignore
Kconfig	arch/cc: Introduce a function to check for confidential computing features	2021-11-18 14:04:32 +01:00