From: Kumar Gala Date: Sat, 13 Dec 2008 23:01:37 +0000 (-0600) Subject: powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted X-Git-Tag: v2.6.28-rc9~25^2 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=e5e774d8833de1a0037be2384efccadf16935675;p=linux-2.6-omap-h63xx.git 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 --- 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 */