[PATCH] powerpc: vdso 64bits gettimeofday bug

A bug in the assembly code of the vdso can cause gettimeofday() to hang
or to return incorrect results. The wrong register was used to test for
pending updates of the calibration variables and to create a dependency
for subsequent loads. This fixes it.

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

diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index ccaeda5..4ee871f 100644 (file)
--- a/arch/powerpc/kernel/vdso64/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso64/gettimeofday.S
@@ -225,9 +225,9 @@ V_FUNCTION_BEGIN(__do_get_xsec)
   .cfi_startproc
        /* check for update count & load values */
 1:     ld      r8,CFG_TB_UPDATE_COUNT(r3)
-       andi.   r0,r4,1                 /* pending update ? loop */
+       andi.   r0,r8,1                 /* pending update ? loop */
        bne-    1b
-       xor     r0,r4,r4                /* create dependency */
+       xor     r0,r8,r8                /* create dependency */
        add     r3,r3,r0
 
        /* Get TB & offset it */