Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull x86/asm changes from Ingo Molnar:
 "Misc optimizations"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Slightly tweak the access_ok() C variant for better code
  x86: Replace assembly access_ok() with a C variant
  x86-64, copy_user: Use leal to produce 32-bit results
  x86-64, copy_user: Remove zero byte check before copy user buffer.