linux-kernel - [tip:x86/asm] x86/asm/entry/64: Clean up usage of TEST insns

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Message-ID: <tip-03335e95e27fc1f2b17b05b27342ad76986b3cf0@git.kernel.org>
Date:	Fri, 8 May 2015 02:25:44 -0700
From:	tip-bot for Denys Vlasenko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	bp@...en8.de, luto@...nel.org, rostedt@...dmis.org,
	oleg@...hat.com, linux-kernel@...r.kernel.org, wad@...omium.org,
	dvlasenk@...hat.com, keescook@...omium.org,
	torvalds@...ux-foundation.org, fweisbec@...il.com, hpa@...or.com,
	brgerst@...il.com, mingo@...nel.org, ast@...mgrid.com,
	tglx@...utronix.de
Subject: [tip:x86/asm] x86/asm/entry/64: Clean up usage of TEST insns

Commit-ID:  03335e95e27fc1f2b17b05b27342ad76986b3cf0
Gitweb:     http://git.kernel.org/tip/03335e95e27fc1f2b17b05b27342ad76986b3cf0
Author:     Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Mon, 27 Apr 2015 15:21:52 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 8 May 2015 11:07:32 +0200

x86/asm/entry/64: Clean up usage of TEST insns

By the nature of TEST operation, it is often possible
to test a narrower part of the operand:

    "testl $3, mem"  -> "testb $3, mem"

This results in shorter insns, because TEST insn has no
sign-entending byte-immediate forms unlike other ALU ops.

   text	   data	    bss	    dec	    hex	filename
  11674	      0	      0	  11674	   2d9a	entry_64.o.before
  11658	      0	      0	  11658	   2d8a	entry_64.o

Changes in object code:

-	f7 84 24 88 00 00 00 03 00 00 00 	testl  $0x3,0x88(%rsp)
+	f6 84 24 88 00 00 00 03	         	testb  $0x3,0x88(%rsp)
-	f7 44 24 68 03 00 00 00          	testl  $0x3,0x68(%rsp)
+	f6 44 24 68 03                  	testb  $0x3,0x68(%rsp)
-	f7 84 24 90 00 00 00 03 00 00 00	testl  $0x3,0x90(%rsp)
+	f6 84 24 90 00 00 00 03         	testb  $0x3,0x90(%rsp)

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Acked-by: Andy Lutomirski <luto@...nel.org>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1430140912-7960-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/entry_64.S | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 8f8b22a..60705b03 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -601,7 +601,7 @@ ENTRY(ret_from_fork)
 
 	RESTORE_EXTRA_REGS
 
-	testl $3,CS(%rsp)			# from kernel_thread?
+	testb	$3, CS(%rsp)			# from kernel_thread?
 
 	/*
 	 * By the time we get here, we have no idea whether our pt_regs,
@@ -665,7 +665,7 @@ END(irq_entries_start)
 
 	leaq -RBP(%rsp),%rdi	/* arg1 for \func (pointer to pt_regs) */
 
-	testl $3, CS-RBP(%rsp)
+	testb	$3, CS-RBP(%rsp)
 	jz	1f
 	SWAPGS
 1:
@@ -720,7 +720,7 @@ ret_from_intr:
 	CFI_DEF_CFA_REGISTER	rsp
 	CFI_ADJUST_CFA_OFFSET	RBP
 
-	testl $3,CS(%rsp)
+	testb	$3, CS(%rsp)
 	jz	retint_kernel
 	/* Interrupt came from user space */
 
@@ -968,7 +968,7 @@ ENTRY(\sym)
 	.if \paranoid
 	.if \paranoid == 1
 	CFI_REMEMBER_STATE
-	testl $3, CS(%rsp)		/* If coming from userspace, switch */
+	testb	$3, CS(%rsp)		/* If coming from userspace, switch */
 	jnz 1f				/* stacks. */
 	.endif
 	call paranoid_entry
@@ -1309,7 +1309,7 @@ ENTRY(error_entry)
 	SAVE_C_REGS 8
 	SAVE_EXTRA_REGS 8
 	xorl %ebx,%ebx
-	testl $3,CS+8(%rsp)
+	testb	$3, CS+8(%rsp)
 	jz	error_kernelspace
 error_swapgs:
 	SWAPGS
@@ -1606,7 +1606,6 @@ end_repeat_nmi:
 	je 1f
 	movq %r12, %cr2
 1:
-	
 	testl %ebx,%ebx				/* swapgs needed? */
 	jnz nmi_restore
 nmi_swapgs:
--
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