linux-kernel - Re: [PATCH] fix calls to request

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Date:	Thu, 11 Dec 2008 13:43:55 +0900
From:	"Nguyen Anh Quynh" <aquynh@...il.com>
To:	"Jianjun Kong" <jianjun@...ux.org>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Al Viro" <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kuniyasu Suzaki" <k.suzaki@...t.go.jp>
Subject: Re: [PATCH] fix calls to request_module()

On Thu, Dec 11, 2008 at 1:40 PM, Jianjun Kong <jianjun@...ux.org> wrote:
>
> * Nguyen Anh Quynh wrote:
>
>>On Thu, Dec 11, 2008 at 1:14 PM, Andrew Morton
>><akpm@...ux-foundation.org> wrote:
>>> On Thu, 11 Dec 2008 04:01:18 +0000 Al Viro <viro@...IV.linux.org.uk> wrote:
>
>>>> > The request_module() function should always have the 1st param as a
>>>> > format argument. So for example, request_module("i2c-powermac") should
>>>> > be called as request_module("%s", "i2c-powermac"). Otherwise, new gcc
>>>> > like gcc 4.3.2 on Ubuntu 8.10 would spit out a lot of warnings. This
>>>> > patch fixes them all in linus-git tree.
>>>>
>>>> ... and it doesn't address the underlying problems at all.  A string literal
>>>> without a single % in it is a perfectly sane and valid format.  _Why_ are
>>>> we getting these warning?
>>>
>>> extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
>>>
>>
>>Sorry that after the mail of Viro, I checked again by recover a code
>>and recompile, but got no warning. But actually that code should not
>>be compiled at all.
>>
>>So I checked again by fixing the code that should be compiled
>>(sound/core/sound.c), and can confirm that without the patch we got
>>warning like below:
>>
>>sound/core/sound.c: In function 'snd_request_other':
>>sound/core/sound.c:91: warning: format not a string literal and no
>>format arguments
>
> Hi,all
> I also use Ubuntu 8.10, gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu11)
>
> When I compile the latest kernel, there are more warning. Like this:
>
> scripts/genksyms/lex.c: In function 'yylex1':
> scripts/genksyms/lex.l:97: warning: ignoring return value of 'fwrite', declared with attribute warn_unused_result
> scripts/mod/modpost.c: In function 'get_markers':
> scripts/mod/modpost.c:1542: warning: ignoring return value of 'asprintf', declared with attribute warn_unused_result
> scripts/mod/modpost.c: In function 'add_marker':
> scripts/mod/modpost.c:1962: warning: ignoring return value of 'asprintf', declared with attribute warn_unused_result
> scripts/kallsyms.c: In function 'read_symbol':
> scripts/kallsyms.c:74: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result
> init/main.c: In function 'start_kernel':
> init/main.c:571: warning: format not a string literal and no format arguments
> init/initramfs.c: In function 'populate_rootfs':
> init/initramfs.c:581: warning: format not a string literal and no format arguments
> usr/gen_init_cpio.c: In function 'cpio_mkfile':
> usr/gen_init_cpio.c:357: warning: ignoring return value of 'fwrite', declared with attribute warn_unused_result
> arch/x86/kernel/dumpstack_32.c: In function 'print_trace_warning_symbol':
> arch/x86/kernel/dumpstack_32.c:125: warning: format not a string literal and no format arguments
> arch/x86/kernel/dumpstack_32.c: In function 'print_trace_address':
> arch/x86/kernel/dumpstack_32.c:147: warning: format not a string literal and no format arguments
> arch/x86/kernel/e820.c: In function 'early_panic':
> arch/x86/kernel/e820.c:1172: warning: format not a string literal and no format arguments
> arch/x86/kernel/e820.c:1173: warning: format not a string literal and no format arguments
> kernel/power/main.c: In function 'test_suspend':
> kernel/power/main.c:720: warning: format not a string literal and no format arguments
> fs/dquot.c: In function 'find_quota_format':
> fs/dquot.c:170: warning: format not a string literal and no format arguments
> crypto/api.c: In function 'crypto_larval_lookup':
> crypto/api.c:218: warning: format not a string literal and no format arguments
> crypto/algapi.c: In function 'crypto_lookup_template':
> crypto/algapi.c:427: warning: format not a string literal and no format arguments
> ...

I saw the same thing. My patch only fixed part of them.

So please submit your patch to fix the remainig :-)

Q
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