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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-02-21 10:37:55 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-02-22 00:10:16 +1100 |
| commit | 93c4a162b014d238a287f8264adb25c009c79e61 (patch) | |
| tree | 22a11a62f16f26c387315108f5b6ff2892f9e14f /arch/powerpc/mm/hash_low_32.S | |
| parent | powerpc/6xx: Don't use SPRN_SPRG2 for storing stack pointer while in RTAS (diff) | |
| download | linux-dev-93c4a162b014d238a287f8264adb25c009c79e61.tar.xz linux-dev-93c4a162b014d238a287f8264adb25c009c79e61.zip | |
powerpc/6xx: Store PGDIR physical address in a SPRG
Use SPRN_SPRG2 to store the current thread PGDIR and
avoid reading thread_struct.pgdir at every TLB miss.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash_low_32.S')
| -rw-r--r-- | arch/powerpc/mm/hash_low_32.S | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S index 1e2df3e9f9ea..82e7dd0c0220 100644 --- a/arch/powerpc/mm/hash_low_32.S +++ b/arch/powerpc/mm/hash_low_32.S @@ -70,9 +70,8 @@ _GLOBAL(hash_page) /* Get PTE (linux-style) and check access */ lis r0,KERNELBASE@h /* check if kernel address */ cmplw 0,r4,r0 - mfspr r8,SPRN_SPRG_THREAD /* current task's THREAD (phys) */ ori r3,r3,_PAGE_USER|_PAGE_PRESENT /* test low addresses as user */ - lwz r5,PGDIR(r8) /* virt page-table root */ + mfspr r5, SPRN_SPRG_PGDIR /* virt page-table root */ blt+ 112f /* assume user more likely */ lis r5,swapper_pg_dir@ha /* if kernel address, use */ addi r5,r5,swapper_pg_dir@l /* kernel page table */ |