path: root/arch/powerpc/kernel/entry_64.S
diff options
authorMichael Neuling <>2007-08-03 11:55:39 +1000
committerPaul Mackerras <>2007-08-03 19:36:01 +1000
commit67439b76f29cb278bb3412fc873b980fc65110c9 (patch)
treed70c627453d429f63c777769f5596184c001fe39 /arch/powerpc/kernel/entry_64.S
parent5628244059976009151d41c2798855290753d8d5 (diff)
[POWERPC] Fixes for the SLB shadow buffer code
On a machine with hardware 64kB pages and a kernel configured for a 64kB base page size, we need to change the vmalloc segment from 64kB pages to 4kB pages if some driver creates a non-cacheable mapping in the vmalloc area. However, we never updated with SLB shadow buffer. This fixes it. Thanks to paulus for finding this. Also added some write barriers to ensure the shadow buffer contents are always consistent. Signed-off-by: Michael Neuling <> Signed-off-by: Paul Mackerras <>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 9ef28da2c7fe..952eba6701f4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -389,8 +389,11 @@ BEGIN_FTR_SECTION
li r12,0
std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
+ eieio
std r7,SLBSHADOW_STACKVSID(r9) /* Save VSID */
+ eieio
std r0,SLBSHADOW_STACKESID(r9) /* Save ESID */
+ eieio
slbie r6
slbie r6 /* Workaround POWER5 < DD2.1 issue */