[PATCH] powerpc: Make the vDSO functions set error code (#2)

The vDSO functions should have the same calling convention as a syscall.
Unfortunately, they currently don't set the cr0.so bit which is used to
indicate an error. This patch makes them clear this bit unconditionally
since all functions currently succeed. The syscall fallback done by some
of them will eventually override this if the syscall fails.

This also changes the symbol version of all vdso exports to make sure
glibc can differenciate between old and fixed calls for existing ones
like __kernel_gettimeofday.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 1a89094715cc..ccaeda5136d1 100644
--- a/arch/powerpc/kernel/vdso64/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso64/gettimeofday.S
@@ -52,6 +52,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
         stw     r4,TZONE_TZ_MINWEST(r10)
         stw     r5,TZONE_TZ_DSTTIME(r10)
 1:      mtlr    r12
+        crclr   cr0*4+so
         li      r3,0                    /* always success */
         blr
   .cfi_endproc
@@ -99,6 +100,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
         std     r0,TSPC64_TV_NSEC(r11)  /* store nsec in tp */
 
         mtlr    r12
+        crclr   cr0*4+so
         li      r3,0
         blr
 
@@ -159,6 +161,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
         std     r7,TSPC64_TV_NSEC(r11)
 
         mtlr    r12
+        crclr   cr0*4+so
         li      r3,0
         blr
 
@@ -193,6 +196,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres)
 
         li      r3,0
         cmpli   cr0,r4,0
+        crclr   cr0*4+so
         beqlr
         lis     r5,CLOCK_REALTIME_RES@h
         ori     r5,r5,CLOCK_REALTIME_RES@l