* Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf)
@ 2011-11-09 8:47 Dave Haywood
2011-11-09 11:33 ` Borislav Petkov
0 siblings, 1 reply; 3+ messages in thread
From: Dave Haywood @ 2011-11-09 8:47 UTC (permalink / raw)
To: Linux Kernel
Hi,
Noticed this new warning in the build of kernel v3.2-rc1-90-g19e0baf:
CC kernel/trace/trace.o
kernel/trace/trace.c: In function 'tracing_mark_write':
kernel/trace/trace.c:3644:8: warning: 'page2' may be used uninitialized in this function
Regards,
Dave.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf)
2011-11-09 8:47 Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf) Dave Haywood
@ 2011-11-09 11:33 ` Borislav Petkov
2011-11-10 1:11 ` Dave Haywood
0 siblings, 1 reply; 3+ messages in thread
From: Borislav Petkov @ 2011-11-09 11:33 UTC (permalink / raw)
To: Dave Haywood; +Cc: Steven Rostedt, Linux Kernel
On Wed, Nov 09, 2011 at 08:47:58AM +0000, Dave Haywood wrote:
> Hi,
>
> Noticed this new warning in the build of kernel v3.2-rc1-90-g19e0baf:
>
> CC kernel/trace/trace.o
> kernel/trace/trace.c: In function 'tracing_mark_write':
> kernel/trace/trace.c:3644:8: warning: 'page2' may be used uninitialized in this function
That has to be gcc 4.5.x something. 4.6 is smarter in that aspect:
$ make CC=gcc-4.6 kernel/trace/trace.o
CHK include/linux/version.h
UPD include/linux/version.h
CHK include/generated/utsrelease.h
UPD include/generated/utsrelease.h
CC kernel/bounds.s
...
HOSTLD scripts/mod/modpost
CC kernel/trace/trace.o
$ make CC=gcc-4.5 kernel/trace/trace.o
CHK include/linux/version.h
CHK include/generated/utsrelease.h
CC kernel/bounds.s
...
HOSTLD scripts/mod/modpost
CC kernel/trace/trace.o
kernel/trace/trace.c: In function ‘tracing_mark_write’:
kernel/trace/trace.c:3644:8: warning: ‘page2’ may be used uninitialized in this function
HTH
--
Regards/Gruss,
Boris.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf)
2011-11-09 11:33 ` Borislav Petkov
@ 2011-11-10 1:11 ` Dave Haywood
0 siblings, 0 replies; 3+ messages in thread
From: Dave Haywood @ 2011-11-10 1:11 UTC (permalink / raw)
To: Borislav Petkov; +Cc: Steven Rostedt, Linux Kernel
On 09/11/2011 11:33, Borislav Petkov wrote:
> On Wed, Nov 09, 2011 at 08:47:58AM +0000, Dave Haywood wrote:
>> Hi,
>>
>> Noticed this new warning in the build of kernel v3.2-rc1-90-g19e0baf:
>>
>> CC kernel/trace/trace.o
>> kernel/trace/trace.c: In function 'tracing_mark_write':
>> kernel/trace/trace.c:3644:8: warning: 'page2' may be used uninitialized in this function
> That has to be gcc 4.5.x something. 4.6 is smarter in that aspect:
Correct, version is:
$ gcc --version
gcc (Gentoo Hardened 4.5.3-r1 p1.0, pie-0.4.5) 4.5.3
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> $ make CC=gcc-4.6 kernel/trace/trace.o
> CHK include/linux/version.h
> UPD include/linux/version.h
> CHK include/generated/utsrelease.h
> UPD include/generated/utsrelease.h
> CC kernel/bounds.s
>
> ...
>
> HOSTLD scripts/mod/modpost
> CC kernel/trace/trace.o
> $ make CC=gcc-4.5 kernel/trace/trace.o
> CHK include/linux/version.h
> CHK include/generated/utsrelease.h
> CC kernel/bounds.s
>
> ...
>
> HOSTLD scripts/mod/modpost
> CC kernel/trace/trace.o
> kernel/trace/trace.c: In function ‘tracing_mark_write’:
> kernel/trace/trace.c:3644:8: warning: ‘page2’ may be used uninitialized in this function
>
> HTH
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-11-09 8:47 Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf) Dave Haywood
2011-11-09 11:33 ` Borislav Petkov
2011-11-10 1:11 ` Dave Haywood
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