linux-kernel - [tip:x86/asm] x86/asm/entry/64: Optimize [v]fork/clone stubs

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Message-ID: <tip-772951c4e4b06cdffeff499259dba07b544f3166@git.kernel.org>
Date:	Thu, 9 Apr 2015 02:02:52 -0700
From:	tip-bot for Denys Vlasenko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, bp@...en8.de, keescook@...omium.org,
	ast@...mgrid.com, rostedt@...dmis.org,
	torvalds@...ux-foundation.org, wad@...omium.org,
	linux-kernel@...r.kernel.org, luto@...capital.net,
	dvlasenk@...hat.com, tglx@...utronix.de, oleg@...hat.com,
	fweisbec@...il.com, brgerst@...il.com, mingo@...nel.org
Subject: [tip:x86/asm] x86/asm/entry/64: Optimize [v]fork/clone stubs

Commit-ID:  772951c4e4b06cdffeff499259dba07b544f3166
Gitweb:     http://git.kernel.org/tip/772951c4e4b06cdffeff499259dba07b544f3166
Author:     Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Tue, 7 Apr 2015 22:43:40 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 9 Apr 2015 10:31:25 +0200

x86/asm/entry/64: Optimize [v]fork/clone stubs

Replace "call func; ret" with "jmp func".

Run-tested.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Andy Lutomirski <luto@...capital.net>
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/1428439424-7258-4-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/entry_64.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 5380b3a..ce85256 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -484,8 +484,7 @@ ENTRY(stub_\func)
 	CFI_STARTPROC
 	DEFAULT_FRAME 0, 8		/* offset 8: return address */
 	SAVE_EXTRA_REGS 8
-	call sys_\func
-	ret
+	jmp sys_\func
 	CFI_ENDPROC
 END(stub_\func)
 	.endm
--
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