From: Andy Lutomirski <luto@MIT.EDU>
To: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
lueckintel@yahoo.com, kimwooyoung@gmail.com,
Ingo Molnar <mingo@elte.hu>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@MIT.EDU>
Subject: [PATCH 2/3] x86-64: Wire up getcpu syscall
Date: Wed, 10 Aug 2011 11:15:31 -0400 [thread overview]
Message-ID: <6b19f55bdb06a0c32c2fa6dba9b6f222e1fde999.1312988155.git.luto@mit.edu> (raw)
In-Reply-To: <cover.1312988155.git.luto@mit.edu>
In-Reply-To: <cover.1312988155.git.luto@mit.edu>
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@mit.edu>
---
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
--
1.7.6
next prev parent reply other threads:[~2011-08-10 15:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-10 15:15 [PATCH 0/3] vsyscall emulation compatibility fixes Andy Lutomirski
2011-08-10 15:15 ` [PATCH 1/3] x86: Remove unnecessary compile flag tweaks for vsyscall code Andy Lutomirski
2011-08-11 0:01 ` [tip:x86/vdso] " tip-bot for Andy Lutomirski
2011-08-10 15:15 ` Andy Lutomirski [this message]
2011-08-11 0:01 ` [tip:x86/vdso] x86-64: Wire up getcpu syscall tip-bot for Andy Lutomirski
2011-08-11 0:31 ` tip-bot for Andy Lutomirski
2011-08-10 15:15 ` [PATCH 3/3] x86-64: Rework vsyscall emulation and add vsyscall= parameter Andy Lutomirski
2011-08-10 17:21 ` H. Peter Anvin
2011-08-10 17:47 ` Andrew Lutomirski
2011-08-10 21:14 ` H. Peter Anvin
2011-08-10 21:18 ` Andrew Lutomirski
2011-08-10 22:20 ` H. Peter Anvin
2011-08-10 22:56 ` Andrew Lutomirski
2011-08-11 0:02 ` [tip:x86/vdso] " tip-bot for Andy Lutomirski
2011-08-11 0:31 ` tip-bot for Andy Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6b19f55bdb06a0c32c2fa6dba9b6f222e1fde999.1312988155.git.luto@mit.edu \
--to=luto@mit.edu \
--cc=andi@firstfloor.org \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=kimwooyoung@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=lueckintel@yahoo.com \
--cc=mingo@elte.hu \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).