Linus, please pull from git://git.infradead.org/users/dwmw2/byteswap.git byteswap-for-linus-20121219 This single patch is effectively a no-op for now. It enables architectures to opt in to using GCC's __builtin_bswapXX() intrinsics for byteswapping, and if we merge this now then the architecture maintainers can enable it for their arch during the next cycle without dependency issues. It's worth making it a par-arch opt-in, because although in *theory* the compiler should never do worse than hand-coded assembler (and of course it also ought to do a lot better on platforms like Atom and PowerPC which have load-and-swap or store-and-swap instructions), that isn't always the case. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46453 for example. David Woodhouse (1): byteorder: allow arch to opt to use GCC intrinsics for byteswapping arch/Kconfig | 19 +++++++++++++++++++ include/linux/compiler-gcc4.h | 10 ++++++++++ include/linux/compiler-intel.h | 7 +++++++ include/uapi/linux/swab.h | 12 +++++++++--- 4 files changed, 45 insertions(+), 3 deletions(-) -- David Woodhouse Open Source Technology Centre David.Woodhouse@xxxxxxxxx Intel Corporation
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