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authorWill Deacon <will.deacon@arm.com>2012-12-04 12:57:11 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-12-07 11:49:06 +0000
commit39b175a0092d4a8e0875c67df82285475b1da591 (patch)
tree094700ff47598dd54cc903486ebf30534f965cd5 /arch/arm/Kconfig
parente91b36efe51b5cbbfe5eb61a653cde5985ae8285 (diff)
downloadlwn-39b175a0092d4a8e0875c67df82285475b1da591.tar.gz
lwn-39b175a0092d4a8e0875c67df82285475b1da591.zip
ARM: 7593/1: nommu: do not enable DCACHE_WORD_ACCESS when !CONFIG_MMU
Commit b9a50f74905a ("ARM: 7450/1: dcache: select DCACHE_WORD_ACCESS for little-endian ARMv6+ CPUs") added support for word-at-time path comparisons, relying on the ability to perform unaligned loads with negligible performance impact in hardware. For nommu configurations without MPU support, this is unpredictable and so we should fall back to the byte-by-byte routines. Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jonathan Austin <jonathan.austin@arm.com> 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/Kconfig')
-rw-r--r--arch/arm/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a40e5f6abda0..27ebd9b3dbaa 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -7,7 +7,7 @@ config ARM
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT if MMU
select CPU_PM if (SUSPEND || CPU_IDLE)
- select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
+ select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select GENERIC_IRQ_PROBE