[PATCH 1/2] powerpc/vdso64: Coarse timer support preparatory patch
From: Santosh Sivaraj <hidden>
Date: 2017-09-18 09:23:47
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Reorganize code to make it easy to introduce CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE timer support. Signed-off-by: Santosh Sivaraj <redacted> --- arch/powerpc/kernel/vdso64/gettimeofday.S | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 382021324883..a0b4943811db 100644
--- a/arch/powerpc/kernel/vdso64/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso64/gettimeofday.S@@ -60,18 +60,20 @@ V_FUNCTION_END(__kernel_gettimeofday) */ V_FUNCTION_BEGIN(__kernel_clock_gettime) .cfi_startproc + mr r11,r4 /* r11 saves tp */ + mflr r12 /* r12 saves lr */ + lis r7,NSEC_PER_SEC@h /* want nanoseconds */ + ori r7,r7,NSEC_PER_SEC@l + /* Check for supported clock IDs */ cmpwi cr0,r3,CLOCK_REALTIME cmpwi cr1,r3,CLOCK_MONOTONIC cror cr0*4+eq,cr0*4+eq,cr1*4+eq - bne cr0,99f + beq cr0,49f - mflr r12 /* r12 saves lr */ + b 99f /* Fallback to syscall */ .cfi_register lr,r12 - mr r11,r4 /* r11 saves tp */ - bl V_LOCAL_FUNC(__get_datapage) /* get data page */ - lis r7,NSEC_PER_SEC@h /* want nanoseconds */ - ori r7,r7,NSEC_PER_SEC@l +49: bl V_LOCAL_FUNC(__get_datapage) /* get data page */ 50: bl V_LOCAL_FUNC(__do_get_tspec) /* get time from tb & kernel */ bne cr1,80f /* if not monotonic, all done */
--
2.13.5