[PATCH 01/13] x86: Add 1/2/4/8 byte optimization to 64bit __copy_{from,to}_user_inatomic

From: Andi Kleen The 64bit __copy_{from,to}_user_inatomic always called copy_from_user_generic, but skipped the special optimizations for 1/2/4/8 byte accesses. This especially hurts the futex call, which accesses the 4 byte futex user value with a complicated fast string operation in a

[PATCH 01/13] x86: Add 1/2/4/8 byte optimization to 64bit __copy_{from,to}_user_inatomic

From: Andi Kleen a...@linux.intel.com The 64bit __copy_{from,to}_user_inatomic always called copy_from_user_generic, but skipped the special optimizations for 1/2/4/8 byte accesses. This especially hurts the futex call, which accesses the 4 byte futex user value with a complicated fast string