linux-kernel - Re: [PATCH -tip v5] tracepoint: Add signal coredump tracepoint

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Message-ID: <20100319141825.GA3530@hmsreliant.think-freely.org>
Date:	Fri, 19 Mar 2010 10:18:25 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Roland McGrath <roland@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -tip v5] tracepoint: Add signal coredump tracepoint

On Fri, Mar 19, 2010 at 10:10:19AM -0400, Masami Hiramatsu wrote:
> Oleg Nesterov wrote:
> > (add Neil)
> > 
> > On 03/19, Masami Hiramatsu wrote:
> >>
> >>  void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> >>  {
> >>  	struct core_state core_state;
> >> -	char corename[CORENAME_MAX_SIZE + 1];
> >> +	char corename[CORENAME_MAX_SIZE + 1] = "";
> >>  	struct mm_struct *mm = current->mm;
> >>  	struct linux_binfmt * binfmt;
> >>  	struct inode * inode;
> >> @@ -1802,6 +1803,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> >>  	static atomic_t core_dump_count = ATOMIC_INIT(0);
> >>  	struct coredump_params cprm = {
> >>  		.signr = signr,
> >> +		.file = NULL,
> >>  		.regs = regs,
> >>  		.limit = rlimit(RLIMIT_CORE),
> >>  		/*
> >> @@ -1815,8 +1817,10 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> >>  	audit_core_dumps(signr);
> >>
> >>  	binfmt = mm->binfmt;
> >> -	if (!binfmt || !binfmt->core_dump)
> >> +	if (!binfmt || !binfmt->core_dump) {
> >> +		retval = -ENOSYS;
> >>  		goto fail;
> >> +	}
> > 
> > Oh.
> > 
> > Masami, may I ask you to delay these changes a bit?
> > 
> > This patch conflicts very much with other changes (hopefully in -mm soon)
> > we are doing.
> > 
> > If your patch comes first, we have to redo 12 patches. Besides, this patch
> > complicates do_coredump() even more while it really needs the cleanups.
> 
> Ah, that's a big conflict :O
> Yes, sure, I can wait for your commits. I'll update this patch on yours.
> 
> > Please see
> > http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/96f01d85034ca029/3b6bcb9b2d756dbc
> > I can send you these patches privately if you wish.
> 
> OK, I can pick them up from the thread:)
> 
> Thank you!
> 
Yes, thank you.  I think you may find if you put them on top of the changes Oleg
and I have made, you'll find this one will be alot cleaner as well.

Thanks!
Neil

> -- 
> Masami Hiramatsu
> e-mail: mhiramat@...hat.com
> 
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