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authorJohannes Berg <johannes@sipsolutions.net>2008-07-25 04:45:33 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:27 -0400
commit58340a07c194e0aed7bc58b61ff24330bb2a409f (patch)
tree907a53c71b3092e3a3a95c6641d4839e20214efd /arch/x86/Kconfig
parente0ce0da9fefcc723dc006c35a7f91a32750abd40 (diff)
introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol
In many cases, especially in networking, it can be beneficial to know at compile time whether the architecture can do unaligned accesses efficiently. This patch introduces a new Kconfig symbol HAVE_EFFICIENT_UNALIGNED_ACCESS for that purpose and adds it to the powerpc and x86 architectures. Also add some documentation about alignment and networking, and especially one intended use of this symbol. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Ingo Molnar <mingo@elte.hu> [x86 architecture part] Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b2ddfcf01728..66f3ab05b18c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -28,6 +28,7 @@ config X86
28 select HAVE_FTRACE 28 select HAVE_FTRACE
29 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64) 29 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
30 select HAVE_ARCH_KGDB if !X86_VOYAGER 30 select HAVE_ARCH_KGDB if !X86_VOYAGER
31 select HAVE_EFFICIENT_UNALIGNED_ACCESS
31 32
32config ARCH_DEFCONFIG 33config ARCH_DEFCONFIG
33 string 34 string