Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[linux-2.6-omap-h63xx.git] / include / asm-i386 / uaccess.h

diff --git a/include/asm-i386/uaccess.h b/include/asm-i386/uaccess.h
index d0d253277be5b7f3f4149affca9ec7d77d2c4ca2..54d905ebc63dd9738e00f592ee0787b371ef1e62 100644 (file)
--- a/include/asm-i386/uaccess.h
+++ b/include/asm-i386/uaccess.h
@@ -390,8 +390,12 @@ unsigned long __must_check __copy_to_user_ll(void __user *to,
                                const void *from, unsigned long n);
 unsigned long __must_check __copy_from_user_ll(void *to,
                                const void __user *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nozero(void *to,
+                               const void __user *from, unsigned long n);
 unsigned long __must_check __copy_from_user_ll_nocache(void *to,
                                const void __user *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nocache_nozero(void *to,
+                               const void __user *from, unsigned long n);
 
 /*
  * Here we special-case 1, 2 and 4-byte copy_*_user invocations.  On a fault
@@ -463,11 +467,36 @@ __copy_to_user(void __user *to, const void *from, unsigned long n)
  * atomic context and will fail rather than sleep.  In this case the
  * uncopied bytes will *NOT* be padded with zeros.  See fs/filemap.h
  * for explanation of why this is needed.
- * FIXME this isn't implimented yet EMXIF
  */
 static __always_inline unsigned long
 __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
 {
+       /* Avoid zeroing the tail if the copy fails..
+        * If 'n' is constant and 1, 2, or 4, we do still zero on a failure,
+        * but as the zeroing behaviour is only significant when n is not
+        * constant, that shouldn't be a problem.
+        */
+       if (__builtin_constant_p(n)) {
+               unsigned long ret;
+
+               switch (n) {
+               case 1:
+                       __get_user_size(*(u8 *)to, from, 1, ret, 1);
+                       return ret;
+               case 2:
+                       __get_user_size(*(u16 *)to, from, 2, ret, 2);
+                       return ret;
+               case 4:
+                       __get_user_size(*(u32 *)to, from, 4, ret, 4);
+                       return ret;
+               }
+       }
+       return __copy_from_user_ll_nozero(to, from, n);
+}
+static __always_inline unsigned long
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+       might_sleep();
        if (__builtin_constant_p(n)) {
                unsigned long ret;
 
@@ -488,9 +517,10 @@ __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
 
 #define ARCH_HAS_NOCACHE_UACCESS
 
-static __always_inline unsigned long __copy_from_user_inatomic_nocache(void *to,
+static __always_inline unsigned long __copy_from_user_nocache(void *to,
                                const void __user *from, unsigned long n)
 {
+       might_sleep();
        if (__builtin_constant_p(n)) {
                unsigned long ret;
 
@@ -510,17 +540,9 @@ static __always_inline unsigned long __copy_from_user_inatomic_nocache(void *to,
 }
 
 static __always_inline unsigned long
-__copy_from_user(void *to, const void __user *from, unsigned long n)
+__copy_from_user_inatomic_nocache(void *to, const void __user *from, unsigned long n)
 {
-       might_sleep();
-       return __copy_from_user_inatomic(to, from, n);
-}
-
-static __always_inline unsigned long
-__copy_from_user_nocache(void *to, const void __user *from, unsigned long n)
-{
-       might_sleep();
-       return __copy_from_user_inatomic_nocache(to, from, n);
+       return __copy_from_user_ll_nocache_nozero(to, from, n);
 }
 
 unsigned long __must_check copy_to_user(void __user *to,