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Message-ID: <49B1428A.9050500@redhat.com>
Date: Fri, 06 Mar 2009 10:34:34 -0500
From: Masami Hiramatsu <mhiramat@...hat.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
Ingo Molnar <mingo@...e.hu>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Nick Piggin <npiggin@...e.de>,
Steven Rostedt <rostedt@...dmis.org>,
Andi Kleen <andi@...stfloor.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Arjan van de Ven <arjan@...radead.org>,
Rusty Russell <rusty@...tcorp.com.au>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH -tip 0/4] Text edit lock and atomic text_poke()
Hi,
Here is a series of patches which introduce text_mutex for protecting
editing kernel text from each other subsystems, and make text_poke()
atomic by using fixmap.
BTW,
> Paravirt and alternatives are always done when SMP is inactive, so there is no
> need to use locks.
Mathieu, I'm not sure that means. alternatives will be called from module
init code and other place where the system has already been running multi-
-threads(and they use smp_alt mutex). So, is it possible that those functions
will sleep or yield to another process?
Anyway, I added a new patch which locks text_mutex in alternative_smp_*.
Thank you,
arch/x86/include/asm/fixmap.h | 2 ++
arch/x86/kernel/alternative.c | 29 ++++++++++++++++++++---------
include/linux/memory.h | 6 ++++++
kernel/kprobes.c | 15 +++++++++++++--
mm/memory.c | 9 +++++++++
5 files changed, 50 insertions(+), 11 deletions(-)
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division
e-mail: mhiramat@...hat.com
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