linux-kernel - [tip:x86/vdso] x86-64: Wire up getcpu syscall

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Message-ID: <tip-fce8dc06423d6fb2709469dc5c55b04e09c1d126@git.kernel.org>
Date:	Thu, 11 Aug 2011 00:31:01 GMT
From:	tip-bot for Andy Lutomirski <luto@....edu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	luto@....edu, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/vdso] x86-64: Wire up getcpu syscall

Commit-ID:  fce8dc06423d6fb2709469dc5c55b04e09c1d126
Gitweb:     http://git.kernel.org/tip/fce8dc06423d6fb2709469dc5c55b04e09c1d126
Author:     Andy Lutomirski <luto@....edu>
AuthorDate: Wed, 10 Aug 2011 11:15:31 -0400
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Wed, 10 Aug 2011 19:26:46 -0500

x86-64: Wire up getcpu syscall

getcpu is available as a vdso entry and an emulated vsyscall.
Programs that for some reason don't want to use the vdso should
still be able to call getcpu without relying on the slow emulated
vsyscall.  It costs almost nothing to expose it as a real syscall.

We also need this for the following patch in vsyscall=native mode.

Signed-off-by: Andy Lutomirski <luto@....edu>
Link: http://lkml.kernel.org/r/6b19f55bdb06a0c32c2fa6dba9b6f222e1fde999.1312988155.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/include/asm/unistd_64.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index 705bf13..d92641c 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -681,6 +681,8 @@ __SYSCALL(__NR_syncfs, sys_syncfs)
 __SYSCALL(__NR_sendmmsg, sys_sendmmsg)
 #define __NR_setns				308
 __SYSCALL(__NR_setns, sys_setns)
+#define __NR_getcpu				309
+__SYSCALL(__NR_getcpu, sys_getcpu)
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR
--
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