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>

3 files changed, 21 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
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a487671c282f..de6b49cd6be8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -112,6 +112,7 @@ config PPC
         select HAVE_FTRACE
         select HAVE_IDE
         select HAVE_IOREMAP_PROT
+        select HAVE_EFFICIENT_UNALIGNED_ACCESS
         select HAVE_KPROBES
         select HAVE_ARCH_KGDB
         select HAVE_KRETPROBES
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
         select HAVE_FTRACE
         select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
         select HAVE_ARCH_KGDB if !X86_VOYAGER
+        select HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 config ARCH_DEFCONFIG
         string