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| author | Helge Deller <deller@gmx.de> | 2018-10-19 21:36:15 +0300 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2018-10-19 23:22:06 +0300 |
| commit | 32c1ceeabda3e37dd94129f915823e7cf0441fc9 (patch) | |
| tree | b507aeb50f3d2d68bf7d9ca4d1da6ed915562886 /arch/parisc/kernel | |
| parent | a45a01160f1d46a3021755a2cf2f433aec008e38 (diff) | |
| download | linux-32c1ceeabda3e37dd94129f915823e7cf0441fc9.tar.xz | |
parisc: Drop two instructions from pte lookup code
Remove two instruction from the hot path. The temporary move to %r9 is
unneccessary, and the zero-inialization of pte happens twice.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/kernel')
| -rw-r--r-- | arch/parisc/kernel/entry.S | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S index d3e2633cd688..1c60408a64ad 100644 --- a/arch/parisc/kernel/entry.S +++ b/arch/parisc/kernel/entry.S @@ -427,8 +427,7 @@ ldw,s \index(\pmd),\pmd bb,>=,n \pmd,_PxD_PRESENT_BIT,\fault dep %r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */ - copy \pmd,%r9 - SHLREG %r9,PxD_VALUE_SHIFT,\pmd + SHLREG \pmd,PxD_VALUE_SHIFT,\pmd extru \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */ shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd /* pmd is now pte */ @@ -447,7 +446,6 @@ .macro L3_ptep pgd,pte,index,va,fault #if CONFIG_PGTABLE_LEVELS == 3 /* we might have a 2-Level scheme, e.g. with 16kb page size */ extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index - copy %r0,\pte extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 ldw,s \index(\pgd),\pgd extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |