Patchwork [3.18-stable] dm bufio: hide bogus warning

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Submitter Arnd Bergmann
Date April 21, 2017, 1:41 p.m.
Message ID <20170421134212.2727744-1-arnd@arndb.de>
Download mbox | patch
Permalink /patch/9692829/
State New
Headers show

Comments

Arnd Bergmann - April 21, 2017, 1:41 p.m.
mips-gcc-5.3 warns about correct code on linux-3.18 and earlier:

In file included from ../include/linux/blkdev.h:4:0,
                 from ../drivers/md/dm-bufio.h:12,
                 from ../drivers/md/dm-bufio.c:9:
../drivers/md/dm-bufio.c: In function 'alloc_buffer':
../include/linux/sched.h:1975:56: warning: 'noio_flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
  current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
../drivers/md/dm-bufio.c:325:11: note: 'noio_flag' was declared here

The warning disappeared on later kernels with this commit: be0c37c985ed
("MIPS: Rearrange PTE bits into fixed positions.")  I assume this only
happened because it changed some inlining decisions.

On 3.18.y, we can shut up the warning by adding an extra initialization.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/md/dm-bufio.c | 1 +
 1 file changed, 1 insertion(+)
gregkh@linuxfoundation.org - April 27, 2017, 9:57 a.m.
On Fri, Apr 21, 2017 at 03:41:10PM +0200, Arnd Bergmann wrote:
> mips-gcc-5.3 warns about correct code on linux-3.18 and earlier:
> 
> In file included from ../include/linux/blkdev.h:4:0,
>                  from ../drivers/md/dm-bufio.h:12,
>                  from ../drivers/md/dm-bufio.c:9:
> ../drivers/md/dm-bufio.c: In function 'alloc_buffer':
> ../include/linux/sched.h:1975:56: warning: 'noio_flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
>                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
> ../drivers/md/dm-bufio.c:325:11: note: 'noio_flag' was declared here
> 
> The warning disappeared on later kernels with this commit: be0c37c985ed
> ("MIPS: Rearrange PTE bits into fixed positions.")  I assume this only
> happened because it changed some inlining decisions.
> 
> On 3.18.y, we can shut up the warning by adding an extra initialization.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Now applied, thanks.

greg k-h

Patch

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index ecbd3ffcf359..91fe43b98c96 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -349,6 +349,7 @@  static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
 	 * as if GFP_NOIO was specified.
 	 */
 
+	noio_flag = 0;
 	if (gfp_mask & __GFP_NORETRY)
 		noio_flag = memalloc_noio_save();