From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 12 Nov 2013 02:46:06 +0000 (+0900)
Subject: Merge branch 'x86-uaccess-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: firefly_0821_release~176^2~5019
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c2136301e43cbb3b71d0163a9949f30dafcb4590;p=firefly-linux-kernel-4.4.55.git

Merge branch 'x86-uaccess-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 uaccess changes from Ingo Molnar:
 "A single change that micro-optimizes __copy_*_user_inatomic(), used by
  the futex code"

* 'x86-uaccess-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Add 1/2/4/8 byte optimization to 64bit __copy_{from,to}_user_inatomic
---

c2136301e43cbb3b71d0163a9949f30dafcb4590
diff --cc arch/x86/include/asm/uaccess_64.h
index 0acae710fa00,64476bb2a146..190413d0de57
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@@ -48,8 -48,36 +48,8 @@@ copy_user_generic(void *to, const void 
  __must_check unsigned long
  copy_in_user(void __user *to, const void __user *from, unsigned len);
  
 -static inline unsigned long __must_check copy_from_user(void *to,
 -					  const void __user *from,
 -					  unsigned long n)
 -{
 -	int sz = __compiletime_object_size(to);
 -
 -	might_fault();
 -	if (likely(sz == -1 || sz >= n))
 -		n = _copy_from_user(to, from, n);
 -#ifdef CONFIG_DEBUG_VM
 -	else
 -		WARN(1, "Buffer overflow detected!\n");
 -#endif
 -	return n;
 -}
 -
 -static __always_inline __must_check
 -int copy_to_user(void __user *dst, const void *src, unsigned size)
 -{
 -	might_fault();
 -
 -	return _copy_to_user(dst, src, size);
 -}
 -
  static __always_inline __must_check
- int __copy_from_user(void *dst, const void __user *src, unsigned size)
+ int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
  {
  	int ret = 0;