• James Hogan's avatar
    Add HAVE_64BIT_ALIGNED_ACCESS · c19fa94a
    James Hogan authored
    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
    Signed-off-by: default avatarJames 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>
Kconfig 11.2 KB