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

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Message-ID: <56e1b5710902050250u244a7499k90ad1825ee85bbad@mail.gmail.com>
Date:	Thu, 5 Feb 2009 11:50:02 +0100
From:	Floris Kraak <randakar@...il.com>
To:	Andreas Schwab <schwab@...e.de>
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 11:27 AM, Andreas Schwab <schwab@...e.de> wrote:
> Floris Kraak <randakar@...il.com> writes:
>
>> Example:
>>
>> kernel/power/main.c:717: warning: format not a string literal and no
>> format arguments
>>
>> This complains about:
>> ..
>>         if (!rtc) {
>>                 printk(warn_no_rtc);
>>                 goto done;
>>         }
>> ..
>>
>> So what is this "warn_no_rtc" thing?
>>
>>         static char             warn_no_rtc[] __initdata =
>>                 KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";
>
> Does it help to make it const?
>
>> That's pretty much GCC failing to recognize that the format is a
>> string literal and then complaining that it isn't.
>
> Since it's a non-const variable it cannot be a string literal.
>

kernel/power/main.c:698: error: warn_no_rtc causes a section type conflict

Nice try ;-)

Replacing __initdata with __devinitconst sounded like it might solve
things ( - http://mail.nl.linux.org/kernelnewbies/2008-02/msg00042.html,
interesting reading) but alas, the warning persists.

(apologies to Andreas for the resend)

Regards,
Floris
---
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety."
  -- Ben Franklin

"The course of history shows that as a government grows, liberty
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