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| author | Michael Neuling <mikey@neuling.org> | 2007-08-03 11:55:39 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-08-03 19:36:01 +1000 |
| commit | 67439b76f29cb278bb3412fc873b980fc65110c9 (patch) | |
| tree | d70c627453d429f63c777769f5596184c001fe39 /arch/powerpc/kernel/entry_64.S | |
| parent | 5628244059976009151d41c2798855290753d8d5 (diff) | |
| download | linux-67439b76f29cb278bb3412fc873b980fc65110c9.tar.gz linux-67439b76f29cb278bb3412fc873b980fc65110c9.tar.bz2 linux-67439b76f29cb278bb3412fc873b980fc65110c9.zip | |
[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 <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 3 |
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 ld r9,PACA_SLBSHADOWPTR(r13) 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 */ |