* [PATCH 1/1] cgroup: fix var may be used uninitialized warning
@ 2015-03-03 8:59 Javier Martinez Canillas
2015-03-03 13:46 ` Tejun Heo
0 siblings, 1 reply; 5+ messages in thread
From: Javier Martinez Canillas @ 2015-03-03 8:59 UTC (permalink / raw)
To: Tejun Heo; +Cc: Li Zefan, cgroups, linux-kernel, Javier Martinez Canillas
When building cgroup, GCC warns that the root variable
may be used uninitialized in the cgroup_mount function.
kernel/cgroup.c: In function ‘cgroup_mount’:
kernel/cgroup.c:1886:13: warning: ‘root’ may be used uninitialized in this function [-Wuninitialized]
kernel/cgroup.c:1742:22: note: ‘root’ was declared here
This can never happen because if the struct cgroup_root
can't be allocated, ret is set to -ENOMEM and the error
returned so the code using root is not reachable. But
set root to NULL just to silence the compiler warning.
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
---
This patch is on top of today's linux-next (tag: next-20150303).
kernel/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 9a567836ee3a..bf1172d1c831 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1739,7 +1739,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
{
struct super_block *pinned_sb = NULL;
struct cgroup_subsys *ss;
- struct cgroup_root *root;
+ struct cgroup_root *root = NULL;
struct cgroup_sb_opts opts;
struct dentry *dentry;
int ret;
--
2.1.3
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] cgroup: fix var may be used uninitialized warning
@ 2015-03-03 13:46 ` Tejun Heo
0 siblings, 0 replies; 5+ messages in thread
From: Tejun Heo @ 2015-03-03 13:46 UTC (permalink / raw)
To: Javier Martinez Canillas; +Cc: Li Zefan, cgroups, linux-kernel
On Tue, Mar 03, 2015 at 09:59:47AM +0100, Javier Martinez Canillas wrote:
> When building cgroup, GCC warns that the root variable
> may be used uninitialized in the cgroup_mount function.
>
> kernel/cgroup.c: In function ‘cgroup_mount’:
> kernel/cgroup.c:1886:13: warning: ‘root’ may be used uninitialized in this function [-Wuninitialized]
> kernel/cgroup.c:1742:22: note: ‘root’ was declared here
>
> This can never happen because if the struct cgroup_root
> can't be allocated, ret is set to -ENOMEM and the error
> returned so the code using root is not reachable. But
> set root to NULL just to silence the compiler warning.
Which compiler are you on?
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] cgroup: fix var may be used uninitialized warning
@ 2015-03-03 13:46 ` Tejun Heo
0 siblings, 0 replies; 5+ messages in thread
From: Tejun Heo @ 2015-03-03 13:46 UTC (permalink / raw)
To: Javier Martinez Canillas
Cc: Li Zefan, cgroups-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
On Tue, Mar 03, 2015 at 09:59:47AM +0100, Javier Martinez Canillas wrote:
> When building cgroup, GCC warns that the root variable
> may be used uninitialized in the cgroup_mount function.
>
> kernel/cgroup.c: In function ‘cgroup_mount’:
> kernel/cgroup.c:1886:13: warning: ‘root’ may be used uninitialized in this function [-Wuninitialized]
> kernel/cgroup.c:1742:22: note: ‘root’ was declared here
>
> This can never happen because if the struct cgroup_root
> can't be allocated, ret is set to -ENOMEM and the error
> returned so the code using root is not reachable. But
> set root to NULL just to silence the compiler warning.
Which compiler are you on?
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] cgroup: fix var may be used uninitialized warning
@ 2015-03-03 15:12 ` Javier Martinez Canillas
0 siblings, 0 replies; 5+ messages in thread
From: Javier Martinez Canillas @ 2015-03-03 15:12 UTC (permalink / raw)
To: Tejun Heo; +Cc: Li Zefan, cgroups, linux-kernel
Hello Tejun,
On 03/03/2015 02:46 PM, Tejun Heo wrote:
> On Tue, Mar 03, 2015 at 09:59:47AM +0100, Javier Martinez Canillas wrote:
>> When building cgroup, GCC warns that the root variable
>> may be used uninitialized in the cgroup_mount function.
>>
>> kernel/cgroup.c: In function ‘cgroup_mount’:
>> kernel/cgroup.c:1886:13: warning: ‘root’ may be used uninitialized in this function [-Wuninitialized]
>> kernel/cgroup.c:1742:22: note: ‘root’ was declared here
>>
>> This can never happen because if the struct cgroup_root
>> can't be allocated, ret is set to -ENOMEM and the error
>> returned so the code using root is not reachable. But
>> set root to NULL just to silence the compiler warning.
>
> Which compiler are you on?
>
Yeah, I noticed that I was using a pretty old 4.7.2 GCC on
that machine and the warning indeed is not seen with 4.9.1.
Sorry for the noise...
> Thanks.
>
Best regard,
Javier
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] cgroup: fix var may be used uninitialized warning
@ 2015-03-03 15:12 ` Javier Martinez Canillas
0 siblings, 0 replies; 5+ messages in thread
From: Javier Martinez Canillas @ 2015-03-03 15:12 UTC (permalink / raw)
To: Tejun Heo
Cc: Li Zefan, cgroups-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
Hello Tejun,
On 03/03/2015 02:46 PM, Tejun Heo wrote:
> On Tue, Mar 03, 2015 at 09:59:47AM +0100, Javier Martinez Canillas wrote:
>> When building cgroup, GCC warns that the root variable
>> may be used uninitialized in the cgroup_mount function.
>>
>> kernel/cgroup.c: In function ‘cgroup_mount’:
>> kernel/cgroup.c:1886:13: warning: ‘root’ may be used uninitialized in this function [-Wuninitialized]
>> kernel/cgroup.c:1742:22: note: ‘root’ was declared here
>>
>> This can never happen because if the struct cgroup_root
>> can't be allocated, ret is set to -ENOMEM and the error
>> returned so the code using root is not reachable. But
>> set root to NULL just to silence the compiler warning.
>
> Which compiler are you on?
>
Yeah, I noticed that I was using a pretty old 4.7.2 GCC on
that machine and the warning indeed is not seen with 4.9.1.
Sorry for the noise...
> Thanks.
>
Best regard,
Javier
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-03-03 15:12 UTC | newest]
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2015-03-03 8:59 [PATCH 1/1] cgroup: fix var may be used uninitialized warning Javier Martinez Canillas
2015-03-03 13:46 ` Tejun Heo
2015-03-03 13:46 ` Tejun Heo
2015-03-03 15:12 ` Javier Martinez Canillas
2015-03-03 15:12 ` Javier Martinez Canillas
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