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authorChristophe Leroy <christophe.leroy@c-s.fr>2020-01-29 12:34:36 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2020-01-30 23:47:09 +1100
commit41196224883a64e56e0ef237c19eb837058df071 (patch)
tree9cd2e9dfb142e496abbc52f5643316ccff1d748a /arch/powerpc
parent76be4414be4a0d17e29e2337167bf976533149cd (diff)
downloadlinux-41196224883a64e56e0ef237c19eb837058df071.tar.bz2
powerpc/32s: Fix kasan_early_hash_table() for CONFIG_VMAP_STACK
On book3s/32 CPUs that are handling MMU through a hash table, MMU_init_hw() function was adapted for VMAP_STACK in order to handle virtual addresses instead of physical addresses in the low level hash functions. When using KASAN, the same adaptations are required for the early hash table set up by kasan_early_hash_table() function. Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/fc8390a33c2a470105f01abbcbdc7916c30c0a54.1580301269.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/kasan/kasan_init_32.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index d3cacd462560..16dd95bd0749 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -185,8 +185,11 @@ u8 __initdata early_hash[256 << 10] __aligned(256 << 10) = {0};
static void __init kasan_early_hash_table(void)
{
- modify_instruction_site(&patch__hash_page_A0, 0xffff, __pa(early_hash) >> 16);
- modify_instruction_site(&patch__flush_hash_A0, 0xffff, __pa(early_hash) >> 16);
+ unsigned int hash = IS_ENABLED(CONFIG_VMAP_STACK) ? (unsigned int)early_hash :
+ __pa(early_hash);
+
+ modify_instruction_site(&patch__hash_page_A0, 0xffff, hash >> 16);
+ modify_instruction_site(&patch__flush_hash_A0, 0xffff, hash >> 16);
Hash = (struct hash_pte *)early_hash;
}