linux-kernel - Re: [PATCH] exec: Make do_coredump more robust and safer when using pipes in core

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Message-Id: <20090628141829.d3c34ad3.akpm@linux-foundation.org>
Date:	Sun, 28 Jun 2009 14:18:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org,
	earl_chew@...lent.com, Oleg Nesterov <oleg@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] exec: Make do_coredump more robust and safer when using
 pipes in core_pattern

On Sun, 28 Jun 2009 23:00:54 +0200 Andi Kleen <andi@...stfloor.org> wrote:

> > 
> > When was the last time we saw a "warning: process `%s' used the
> > obsolete bdflush system call" warning?  A quick google here says 2004. 
> > Is that data?  A bit, I guess.
> 
> bdflush? 

I don't understand your answer.

Many years ago (guess: 2001/2002) the bdflush() syscall was deprecated
and we did

	if (msg_count < 5) {
		msg_count++;
		printk(KERN_INFO
			"warning: process `%s' used the obsolete bdflush"
			" system call\n", current->comm);
		printk(KERN_INFO "Fix your initscripts?\n");
	}

to encourage people to stop using it.  A brief search indicates that
nobody has reported this message in 4-5 years.

So to answer the question "how long must we leave things in place before
removing them?", that's the only data I am aware of.

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