[PATCH] x86_64: Small assembly improvements

Save a byte here and there.  Ultimatively useless, but these things always
catch my eyes when reading the code so just fix them for now.

Also I got at least one patch fixing of them already, which gives a good
excuse.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 28817490fdc6..0696e025dce5 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -76,7 +76,7 @@
 
         .macro FAKE_STACK_FRAME child_rip
         /* push in order ss, rsp, eflags, cs, rip */
-        xorq %rax, %rax
+        xorl %eax, %eax
         pushq %rax /* ss */
         CFI_ADJUST_CFA_OFFSET   8
         pushq %rax /* rsp */
@@ -423,7 +423,7 @@ ENTRY(stub_rt_sigreturn)
         testl $3,CS(%rdi)
         je 1f
         swapgs  
-1:      addl $1,%gs:pda_irqcount        # RED-PEN should check preempt count
+1:      incl    %gs:pda_irqcount        # RED-PEN should check preempt count
         movq %gs:pda_irqstackptr,%rax
         cmoveq %rax,%rsp                                                        
         pushq %rdi                      # save old stack        
@@ -436,7 +436,7 @@ ENTRY(common_interrupt)
 ret_from_intr:          
         popq  %rdi
         cli     
-        subl $1,%gs:pda_irqcount
+        decl %gs:pda_irqcount
 #ifdef CONFIG_DEBUG_INFO
         movq RBP(%rdi),%rbp
 #endif
@@ -494,7 +494,7 @@ retint_signal:
         sti
         SAVE_REST
         movq $-1,ORIG_RAX(%rsp)                         
-        xorq %rsi,%rsi          # oldset
+        xorl %esi,%esi          # oldset
         movq %rsp,%rdi          # &pt_regs
         call do_notify_resume
         RESTORE_REST
@@ -752,7 +752,7 @@ child_rip:
         movq %rsi, %rdi
         call *%rax
         # exit
-        xorq %rdi, %rdi
+        xorl %edi, %edi
         call do_exit
 
 /*