diff options
| author | Christophe Leroy | 2019-02-21 10:37:58 +0000 |
|---|---|---|
| committer | Michael Ellerman | 2019-02-22 00:10:16 +1100 |
| commit | a8a121995b2e4f227fddc534c6bd5f1c02cbe2ee (patch) | |
| tree | bcf5a56c1b6a12d0c518574cb8605003f5460c0e /arch/powerpc | |
| parent | 6790dae886f9a95018c52165171b905a8cc47588 (diff) | |
powerpc/603: Don't handle kernel page TLB misses when not need
ITLB miss on kernel pages only occur with CONFIG_MODULES and
CONFIG_DEBUG_PAGEALLOC.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index 4c2cc42399aa..e4338d785a94 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -498,15 +498,19 @@ InstructionTLBMiss: */ /* Get PTE (linux-style) and check access */ mfspr r3,SPRN_IMISS +#if defined(CONFIG_MODULES) || defined(CONFIG_DEBUG_PAGEALLOC) lis r1,PAGE_OFFSET@h /* check if kernel address */ cmplw 0,r1,r3 +#endif mfspr r2, SPRN_SPRG_PGDIR li r1,_PAGE_USER|_PAGE_PRESENT|_PAGE_EXEC /* low addresses tested as user */ +#if defined(CONFIG_MODULES) || defined(CONFIG_DEBUG_PAGEALLOC) bge- 112f mfspr r2,SPRN_SRR1 /* and MSR_PR bit from SRR1 */ rlwimi r1,r2,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */ lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ +#endif 112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ lwz r2,0(r2) /* get pmd entry */ rlwinm. r2,r2,0,0,19 /* extract address of pte page */ |