x86/asm: Enable fast 32-bit put_user_64() for copy_to_user()
authorChris Wilson <chris@chris-wilson.co.uk>
Wed, 15 Apr 2015 09:51:26 +0000 (10:51 +0100)
committerIngo Molnar <mingo@kernel.org>
Thu, 16 Apr 2015 10:08:21 +0000 (12:08 +0200)
For fixed sized copies, copy_to_user() will utilize
__put_user_size() fastpaths. However, it is missing the
translation for 64-bit copies on x86/32.

Testing on a Pinetrail Atom, the 64 bit put_user() fastpath
is substantially faster than the generic copy_to_user()
fallback.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: intel-gfx@lists.freedesktop.org
Link: http://lkml.kernel.org/r/1429091486-11443-1-git-send-email-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/uaccess_32.h

index 3c03a5d..0ed5504 100644 (file)
@@ -59,6 +59,10 @@ __copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
                        __put_user_size(*(u32 *)from, (u32 __user *)to,
                                        4, ret, 4);
                        return ret;
+               case 8:
+                       __put_user_size(*(u64 *)from, (u64 __user *)to,
+                                       8, ret, 8);
+                       return ret;
                }
        }
        return __copy_to_user_ll(to, from, n);