openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[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>
This commit is contained in:
Benjamin Herrenschmidt 2006-02-26 08:09:00 +11:00 committed by Paul Mackerras
parent 827c1a6c1a
commit 634473db86
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/vdso64/gettimeofday.S
View File

@ -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 */