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
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
drmem.c
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
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
ioremap_64.c
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
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
numa.c	powerpc/mm: Add __init attribute to eligible functions	2021-12-23 22:33:11 +11:00
pageattr.c
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
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