From 67439b76f29cb278bb3412fc873b980fc65110c9 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Fri, 3 Aug 2007 11:55:39 +1000 Subject: [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 --- arch/powerpc/kernel/entry_64.S | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/powerpc/kernel') diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 9ef28da2c7f..952eba6701f 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 */ -- cgit v1.2.3