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authorHelge Deller <deller@gmx.de>2018-10-19 20:36:15 +0200
committerHelge Deller <deller@gmx.de>2018-10-19 22:22:06 +0200
commit32c1ceeabda3e37dd94129f915823e7cf0441fc9 (patch)
treeb507aeb50f3d2d68bf7d9ca4d1da6ed915562886 /arch/parisc/kernel
parentparisc: Use zdep for shlw macro on PA1.1 and PA2.0 (diff)
downloadlinux-dev-32c1ceeabda3e37dd94129f915823e7cf0441fc9.tar.xz
linux-dev-32c1ceeabda3e37dd94129f915823e7cf0441fc9.zip
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 '')
-rw-r--r--arch/parisc/kernel/entry.S4
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