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linux/arch/powerpc/mm
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Christophe Leroy aec982603a powerpc/fixmap: Fix VM debug warning on unmap 
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
2022-01-24 17:29:05 +11:00
..
book3s32 powerpc/32s: Fix kasan_init_region() for KASAN 2022-01-16 20:51:05 +11:00
book3s64 powerpc/mm/book3s64/hash: Switch pre 2.06 tlbiel to .long 2021-12-23 22:35:13 +11:00
kasan powerpc/32s: Fix kasan_init_region() for KASAN 2022-01-16 20:51:05 +11:00
nohash powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
ptdump powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
cacheflush.c powerpc/mem: Use kmap_local_page() in flushing functions 2021-04-14 23:04:19 +10:00
copro_fault.c powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU 2021-12-09 22:41:13 +11:00
dma-noncoherent.c dma-mapping: merge <linux/dma-noncoherent.h> into <linux/dma-map-ops.h> 2020-10-06 07:07:06 +02:00
drmem.c pseries/drmem: update LMBs after LPM 2021-08-10 23:14:55 +10:00
fault.c Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
hugetlbpage.c powerpc/64s: Always define arch unmapped area calls 2021-12-09 22:40:24 +11:00
init_32.c powerpc: Enable KFENCE for PPC32 2021-03-24 14:09:30 +11:00
init_64.c powerpc/64s: Make hash MMU support configurable 2021-12-09 22:40:24 +11:00
init-common.c powerpc/kuep: Remove 'nosmep' boot time parameter except for book3s/64 2021-12-09 22:41:18 +11:00
ioremap_32.c powerpc/mm: Leave a gap between early allocated IO areas 2021-06-25 00:07:10 +10:00
ioremap_64.c powerpc/mm: Leave a gap between early allocated IO areas 2021-06-25 00:07:10 +10:00
ioremap.c powerpc: make memremap_compat_align 64s-only 2021-12-02 22:57:24 +11:00
maccess.c powerpc/inst: Optimise copy_inst_from_kernel_nofault() 2021-12-09 22:41:21 +11:00
Makefile powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
mem.c powerpc/code-patching: Remove init_mem_is_free 2021-12-23 22:35:24 +11:00
mmap.c powerpc/64s: Always define arch unmapped area calls 2021-12-09 22:40:24 +11:00
mmu_context.c powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
mmu_decl.h powerpc/fsl_booke: Update of TLBCAMs after init 2021-10-22 15:22:03 +11:00
numa.c powerpc/mm: Add __init attribute to eligible functions 2021-12-23 22:33:11 +11:00
pageattr.c powerpc/mm: Fix set_memory_*() against concurrent accesses 2021-08-19 09:41:54 +10:00
pgtable_32.c Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
pgtable_64.c powerpc/64s/radix: Fix huge vmap false positive 2021-12-20 12:13:32 +11:00
pgtable-frag.c powerpc/mm/radix: Fix PTE/PMD fragment count for early page table mappings 2020-07-20 22:57:56 +10:00
pgtable.c powerpc/fixmap: Fix VM debug warning on unmap 2022-01-24 17:29:05 +11:00
slice.c powerpc/64s: Always define arch unmapped area calls 2021-12-09 22:40:24 +11:00