renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-29 15:43:59 +08:00
Code

powerpc/vdso32: miscellaneous optimisations

Browse Source 
Various optimisations by inverting branches and removing
redundant instructions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b4e79f963845545bcce1459cd6fcfe46bdde7863.1575273217.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-12-02 07:57:35 +00:00 committed by Michael Ellerman
parent e33ffc956b
commit bfc2eae0ad
3 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/kernel/vdso32/datapage.S
View File

@ -30,11 +30,10 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
.cfi_startproc
mflr r12
.cfi_register lr,r12
mr r4,r3
mr. r4,r3
get_datapage r3, r0
mtlr r12
addi r3,r3,CFG_SYSCALL_MAP32
cmpli cr0,r4,0
beqlr
li r0,NR_syscalls
stw r0,0(r4)

6
arch/powerpc/kernel/vdso32/getcpu.S
View File

@ -25,10 +25,10 @@ V_FUNCTION_BEGIN(__kernel_getcpu)
rlwinm r7,r5,16,31-15,31-0
beq cr0,1f
stw r6,0(r3)
1: beq cr1,2f
stw r7,0(r4)
2: crclr cr0*4+so
1: crclr cr0*4+so
li r3,0 /* always success */
beqlr cr1
stw r7,0(r4)
blr
.cfi_endproc
V_FUNCTION_END(__kernel_getcpu)

18
arch/powerpc/kernel/vdso32/gettimeofday.S
View File

@ -32,10 +32,9 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
mflr r12
.cfi_register lr,r12
mr r10,r3 /* r10 saves tv */
mr. r10,r3 /* r10 saves tv */
mr r11,r4 /* r11 saves tz */
get_datapage r9, r0
cmplwi r10,0 /* check if tv is NULL */
beq 3f
LOAD_REG_IMMEDIATE(r7, 1000000) /* load up USEC_PER_SEC */
bl __do_get_tspec@local /* get sec/usec from tb & kernel */
@ -43,15 +42,16 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
stw r4,TVAL32_TV_USEC(r10)
3: cmplwi r11,0 /* check if tz is NULL */
beq 1f
mtlr r12
crclr cr0*4+so
li r3,0
beqlr
lwz r4,CFG_TZ_MINUTEWEST(r9)/* fill tz */
lwz r5,CFG_TZ_DSTTIME(r9)
stw r4,TZONE_TZ_MINWEST(r11)
stw r5,TZONE_TZ_DSTTIME(r11)
1: mtlr r12
crclr cr0*4+so
li r3,0
blr
.cfi_endproc
V_FUNCTION_END(__kernel_gettimeofday)
@ -245,10 +245,10 @@ V_FUNCTION_BEGIN(__kernel_time)
lwz r3,STAMP_XTIME_SEC+LOPART(r9)
cmplwi r11,0 /* check if t is NULL */
beq 2f
stw r3,0(r11) /* store result at *t */
2: mtlr r12
mtlr r12
crclr cr0*4+so
beqlr
stw r3,0(r11) /* store result at *t */
blr
.cfi_endproc
V_FUNCTION_END(__kernel_time)