x86-64, copy_user: Use leal to produce 32-bit results

When we are using lea to produce a 32-bit result, we can use the leal
form, rather than using leaq and worry about truncation elsewhere.

Make the leal explicit, both to be more obvious and since that is what
gcc generates and thus is less likely to trigger obscure gas bugs.

Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1384634221-6006-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S
index ffe4eb9..dee945d 100644 (file)
--- a/arch/x86/lib/copy_user_64.S
+++ b/arch/x86/lib/copy_user_64.S
@@ -186,7 +186,7 @@ ENTRY(copy_user_generic_unrolled)
 30:    shll $6,%ecx
        addl %ecx,%edx
        jmp 60f
-40:    lea (%rdx,%rcx,8),%rdx
+40:    leal (%rdx,%rcx,8),%edx
        jmp 60f
 50:    movl %ecx,%edx
 60:    jmp copy_user_handle_tail /* ecx is zerorest also */
@@ -252,7 +252,7 @@ ENTRY(copy_user_generic_string)
        ret
 
        .section .fixup,"ax"
-11:    lea (%rdx,%rcx,8),%rcx
+11:    leal (%rdx,%rcx,8),%ecx
 12:    movl %ecx,%edx          /* ecx is zerorest also */
        jmp copy_user_handle_tail
        .previous