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| author | Will Deacon <will.deacon@arm.com> | 2012-12-04 12:57:11 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-12-07 11:49:06 +0000 |
| commit | 39b175a0092d4a8e0875c67df82285475b1da591 (patch) | |
| tree | 094700ff47598dd54cc903486ebf30534f965cd5 /arch/arm/Kconfig | |
| parent | e91b36efe51b5cbbfe5eb61a653cde5985ae8285 (diff) | |
| download | lwn-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/Kconfig | 2 |
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 |