Commit 39b175a0 authored by Will Deacon's avatar Will Deacon Committed by Russell King
Browse files

ARM: 7593/1: nommu: do not enable DCACHE_WORD_ACCESS when !CONFIG_MMU 



Commit b9a50f74 ("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: default avatarNicolas Pitre <nico@linaro.org>
Tested-by: default avatarJonathan Austin <jonathan.austin@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e91b36ef

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

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