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| author | Will Deacon <will.deacon@arm.com> | 2012-08-10 20:13:36 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-08-11 10:16:00 +0200 |
| commit | 730a8128cd8978467eb1cf546b11014acb57d433 (patch) | |
| tree | 010d027425130eb77c868c69365d6b0eb1c5a604 /arch/arm/mm/tlb-v7.S | |
| parent | ARM: 7488/1: mm: use 5 bits for swapfile type encoding (diff) | |
| download | linux-730a8128cd8978467eb1cf546b11014acb57d433.tar.xz linux-730a8128cd8978467eb1cf546b11014acb57d433.zip | |
ARM: 7489/1: errata: fix workaround for erratum #720789 on UP systems
Commit 5a783cbc4836 ("ARM: 7478/1: errata: extend workaround for erratum
#720789") added workarounds for erratum #720789 to the range TLB
invalidation functions with the observation that the erratum only
affects SMP platforms. However, when running an SMP_ON_UP kernel on a
uniprocessor platform we must take care to preserve the ASID as the
workaround is not required.
This patch ensures that we don't set the ASID to 0 when flushing the TLB
on such a system, preserving the original behaviour with the workaround
disabled.
Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/tlb-v7.S')
| -rw-r--r-- | arch/arm/mm/tlb-v7.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mm/tlb-v7.S b/arch/arm/mm/tlb-v7.S index c2021139cb56..ea94765acf9a 100644 --- a/arch/arm/mm/tlb-v7.S +++ b/arch/arm/mm/tlb-v7.S @@ -38,10 +38,10 @@ ENTRY(v7wbi_flush_user_tlb_range) dsb mov r0, r0, lsr #PAGE_SHIFT @ align address mov r1, r1, lsr #PAGE_SHIFT -#ifdef CONFIG_ARM_ERRATA_720789 - mov r3, #0 -#else asid r3, r3 @ mask ASID +#ifdef CONFIG_ARM_ERRATA_720789 + ALT_SMP(W(mov) r3, #0 ) + ALT_UP(W(nop) ) #endif orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA mov r1, r1, lsl #PAGE_SHIFT |