linux-kernel - Re: [PATCH] Kbuild: Disable the -Wformat-security gcc flag

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Date:	Tue, 10 Feb 2009 16:11:30 -0500
From:	Kyle Moffett <kyle@...fetthome.net>
To:	Floris Kraak <randakar@...il.com>
Cc:	Roland Dreier <rdreier@...co.com>,
	Robert Hancock <hancockrwd@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trivial Patch Monkey <trivial@...nel.org>
Subject: Re: [PATCH] Kbuild: Disable the -Wformat-security gcc flag

On Thu, Feb 5, 2009 at 3:26 AM, Floris Kraak <randakar@...il.com> wrote:
> There are probably some real bugs in there. On the other hand there is
> some overhead to fixing the warnings. Kernel text size increase,
> possibly some CPU overhead from parsing the format string. Hopefully
> none of these calls are in really hot code paths ;-)

Actually, I would really suspect that CPU time would *decrease* for
most of these, because instead of groveling through the whole argument
string looking for '%' symbols we would do a single "%s" lookup
followed by a basic strncpy(dmesg_buffer + offset, arg,
dmesg_buffer_size - offset);

Cheers,
Kyle Moffett
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