From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH 5/5] ftrace, x86: do not depend on system state for kernel text info
Date: Fri, 20 Feb 2009 18:34:54 +0100 [thread overview]
Message-ID: <20090220173454.GK24538@elte.hu> (raw)
In-Reply-To: <20090220164046.528070886@goodmis.org>
* Steven Rostedt <rostedt@goodmis.org> wrote:
> From: Steven Rostedt <srostedt@redhat.com>
>
> Andrew Morton pointed out that using SYSTEM_STATE is a bad idea
> since there is no guarantee to what its state will actually be.
>
> Instead, I moved the check into the set_kernel_text_* functions
> themselves, and use a local variable to determine when it is
> OK to change the kernel text RW permissions.
>
> Reported-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
> ---
> arch/x86/kernel/ftrace.c | 8 --------
> arch/x86/mm/init_32.c | 10 ++++++++++
> arch/x86/mm/init_64.c | 10 ++++++++++
> 3 files changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
> index c9ba2f9..025d783 100644
> --- a/arch/x86/kernel/ftrace.c
> +++ b/arch/x86/kernel/ftrace.c
> @@ -28,20 +28,12 @@
>
> int ftrace_arch_modify_prepare(void)
> {
> - /* at boot up, we are still writable */
> - if (system_state != SYSTEM_RUNNING)
> - return 0;
> -
Since i suspect you'll rebase anyway, i'd suggest to squash this
patch into patch #2, with credit to Andrew added.
Ingo
next prev parent reply other threads:[~2009-02-20 17:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-20 16:38 [git pull] updates for tip Steven Rostedt
2009-02-20 16:38 ` [PATCH 1/5] ftrace: allow archs to preform pre and post process for code modification Steven Rostedt
2009-02-20 17:25 ` Ingo Molnar
2009-02-20 17:32 ` Steven Rostedt
2009-02-20 16:38 ` [PATCH 2/5] ftrace, x86: make kernel text writable only for conversions Steven Rostedt
2009-02-20 17:30 ` Ingo Molnar
2009-02-20 17:52 ` Steven Rostedt
2009-02-20 17:55 ` Ingo Molnar
2009-02-20 18:00 ` Steven Rostedt
2009-02-20 16:38 ` [PATCH 3/5] ftrace: immediately stop code modification if failure is detected Steven Rostedt
2009-02-20 16:38 ` [PATCH 4/5] ftrace: break out modify loop immediately on detection of error Steven Rostedt
2009-02-20 17:33 ` Ingo Molnar
2009-02-20 17:54 ` Steven Rostedt
2009-02-20 16:38 ` [PATCH 5/5] ftrace, x86: do not depend on system state for kernel text info Steven Rostedt
2009-02-20 17:34 ` Ingo Molnar [this message]
2009-02-20 17:54 ` Steven Rostedt
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