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authorKumar Gala <galak@kernel.crashing.org>2008-12-13 17:01:37 -0600
committerKumar Gala <galak@kernel.crashing.org>2008-12-13 17:02:47 -0600
commite5e774d8833de1a0037be2384efccadf16935675 (patch)
treefaab96f099076670dd73eb85b19d532b0fd2efa6 /arch/powerpc/kernel
parentab44f4627e2160cddbddbe8aa8b1d2b2e1559790 (diff)
powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted
An example calling sequence which we did see: copy_user_highpage -> kmap_atomic -> flush_tlb_page -> _tlbil_va We got interrupted after setting up the MAS registers before the tlbwe and the interrupt handler that caused the interrupt also did a kmap_atomic (ide code) and thus on returning from the interrupt the MAS registers no longer contained the proper values. Since we dont save/restore MAS registers for normal interrupts we need to disable interrupts in _tlbil_va to ensure atomicity. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/misc_32.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index bdc8b0e860e..d108715129e 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -479,6 +479,8 @@ _GLOBAL(_tlbil_pid)
* (no broadcast)
*/
_GLOBAL(_tlbil_va)
+ mfmsr r10
+ wrteei 0
slwi r4,r4,16
mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
tlbsx 0,r3
@@ -490,6 +492,7 @@ _GLOBAL(_tlbil_va)
tlbwe
msync
isync
+ wrtee r10
blr
#endif /* CONFIG_FSL_BOOKE */