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authorJohannes Berg <johannes@sipsolutions.net>2008-07-25 01:45:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:27 -0700
commit58340a07c194e0aed7bc58b61ff24330bb2a409f (patch)
tree907a53c71b3092e3a3a95c6641d4839e20214efd /arch/Kconfig
parente0ce0da9fefcc723dc006c35a7f91a32750abd40 (diff)
downloadlwn-58340a07c194e0aed7bc58b61ff24330bb2a409f.tar.gz
lwn-58340a07c194e0aed7bc58b61ff24330bb2a409f.zip
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/Kconfig')
-rw-r--r--arch/Kconfig19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 6093c0be58b0..b0fabfa864ff 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -27,6 +27,25 @@ config KPROBES
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
+config HAVE_EFFICIENT_UNALIGNED_ACCESS
+ def_bool n
+ help
+ Some architectures are unable to perform unaligned accesses
+ without the use of get_unaligned/put_unaligned. Others are
+ unable to perform such accesses efficiently (e.g. trap on
+ unaligned access and require fixing it up in the exception
+ handler.)
+
+ This symbol should be selected by an architecture if it can
+ perform unaligned accesses efficiently to allow different
+ code paths to be selected for these cases. Some network
+ drivers, for example, could opt to not fix up alignment
+ problems with received packets if doing so would not help
+ much.
+
+ See Documentation/unaligned-memory-access.txt for more
+ information on the topic of unaligned memory accesses.
+
config KRETPROBES
def_bool y
depends on KPROBES && HAVE_KRETPROBES