From 32c1ceeabda3e37dd94129f915823e7cf0441fc9 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Fri, 19 Oct 2018 20:36:15 +0200 Subject: 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 --- arch/parisc/kernel/entry.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'arch/parisc/kernel') 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 -- cgit v1.2.3-59-g8ed1b