Commit c19fa94a authored May 30, 2012 by James Hogan

Add HAVE_64BIT_ALIGNED_ACCESS



On 64 bit architectures with no efficient unaligned access, padding and
explicit alignment must be added in various places to prevent unaligned
64bit accesses (such as taskstats and trace ring buffer).

However this also needs to apply to 32 bit architectures with 64 bit
accesses requiring alignment such as metag.

This is solved by adding a new Kconfig symbol HAVE_64BIT_ALIGNED_ACCESS
which defaults to 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS, and can be
explicitly selected by METAG and any other relevant architectures. This
can be used in various places to determine whether 64bit alignment is
required.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: Will Drewry <wad@chromium.org>

parent c07380be

arch/Kconfig

+16 −0

Original line number	Diff line number	Diff line
		@@ -94,6 +94,22 @@ config UPROBES

		If in doubt, say "N".

		config HAVE_64BIT_ALIGNED_ACCESS
		def_bool 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS
		help
		Some architectures require 64 bit accesses to be 64 bit
		aligned, which also requires structs containing 64 bit values
		to be 64 bit aligned too. This includes some 32 bit
		architectures which can do 64 bit accesses, as well as 64 bit
		architectures without unaligned access.

		This symbol should be selected by an architecture if 64 bit
		accesses are required to be 64 bit aligned in this way even
		though it is not a 64 bit architecture.

		See Documentation/unaligned-memory-access.txt for more
		information on the topic of unaligned memory accesses.

		config HAVE_EFFICIENT_UNALIGNED_ACCESS
		bool
		help