* Re: [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true'
[not found] ` <20191030033925.GA14630@ubuntu-m2-xlarge-x86>
@ 2019-10-30 15:45 ` Darrick J. Wong
2019-10-30 15:48 ` Nathan Chancellor
2019-10-31 0:06 ` Ian Kent
0 siblings, 2 replies; 3+ messages in thread
From: Darrick J. Wong @ 2019-10-30 15:45 UTC (permalink / raw)
To: Nathan Chancellor, Ian Kent
Cc: kbuild, Nick Desaulniers, clang-built-linux, kbuild test robot, xfs
On Tue, Oct 29, 2019 at 08:39:25PM -0700, Nathan Chancellor wrote:
> On Tue, Oct 29, 2019 at 02:45:40PM +0800, kbuild test robot wrote:
> > CC: kbuild-all@lists.01.org
> > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > TO: Ian Kent <raven@themaw.net>
> > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > CC: Christoph Hellwig <hch@lst.de>
FYI, It's customary to cc the patch author [and the xfs list]...
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git mount-api-crash
> > head: e35c37b1b9987c8d87d91dbeca6c24aade2a3390
> > commit: a5a36409da3a608c815b38b0ff2eb5bcfc1adec6 [91/104] xfs: use super s_id instead of struct xfs_mount
> > config: x86_64-rhel-7.6 (attached as .config)
> > compiler: clang version 10.0.0 (git://gitmirror/llvm_project 7cd595df96d5929488063d8ff5cc3b5d800386da)
> > reproduce:
> > git checkout a5a36409da3a608c815b38b0ff2eb5bcfc1adec6
> > # save the attached .config to linux build tree
> > make ARCH=x86_64
> >
> > If you fix the issue, kindly add following tag
> > Reported-by: kbuild test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true' [-Wpointer-bool-conversion]
> > if (mp && mp->m_super && mp->m_super->s_id) {
> > ~~ ~~~~~~~~~~~~~^~~~
...so, Ian, I guess this isn't necessary ^^^^^^^^^^^^^^^^
because it's a char array, not a pointer. :)
Good catch!
--D
> > 1 warning generated.
> >
> > vim +23 fs/xfs/xfs_message.c
> >
> > 13
> > 14 /*
> > 15 * XFS logging functions
> > 16 */
> > 17 static void
> > 18 __xfs_printk(
> > 19 const char *level,
> > 20 const struct xfs_mount *mp,
> > 21 struct va_format *vaf)
> > 22 {
> > > 23 if (mp && mp->m_super && mp->m_super->s_id) {
> > 24 printk("%sXFS (%s): %pV\n", level, mp->m_super->s_id, vaf);
> > 25 return;
> > 26 }
> > 27 printk("%sXFS: %pV\n", level, vaf);
> > 28 }
> > 29
> >
> > ---
> > 0-DAY kernel test infrastructure Open Source Technology Center
> > https://lists.01.org/pipermail/kbuild-all Intel Corporation
> >
>
> Hi Darrick,
>
> The 0day team has been doing clang builds for us and we've been
> forwarding the valid warnings along to developers. This appeared after
> the commit listed above. That check should be unnecessary, perhaps you
> meant to check for something else? Thanks for looking into this.
>
> Cheers,
> Nathan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true'
2019-10-30 15:45 ` [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true' Darrick J. Wong
@ 2019-10-30 15:48 ` Nathan Chancellor
2019-10-31 0:06 ` Ian Kent
1 sibling, 0 replies; 3+ messages in thread
From: Nathan Chancellor @ 2019-10-30 15:48 UTC (permalink / raw)
To: Darrick J. Wong
Cc: Ian Kent, kbuild, Nick Desaulniers, clang-built-linux,
kbuild test robot, xfs
On Wed, Oct 30, 2019 at 08:45:43AM -0700, Darrick J. Wong wrote:
> On Tue, Oct 29, 2019 at 08:39:25PM -0700, Nathan Chancellor wrote:
> > On Tue, Oct 29, 2019 at 02:45:40PM +0800, kbuild test robot wrote:
> > > CC: kbuild-all@lists.01.org
> > > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > > TO: Ian Kent <raven@themaw.net>
> > > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > > CC: Christoph Hellwig <hch@lst.de>
>
> FYI, It's customary to cc the patch author [and the xfs list]...
Ugh sorry, was in a rush last night and not paying attention :( will be
better next time and thanks for adding the right people!
Cheers,
Nathan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true'
2019-10-30 15:45 ` [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true' Darrick J. Wong
2019-10-30 15:48 ` Nathan Chancellor
@ 2019-10-31 0:06 ` Ian Kent
1 sibling, 0 replies; 3+ messages in thread
From: Ian Kent @ 2019-10-31 0:06 UTC (permalink / raw)
To: Darrick J. Wong, Nathan Chancellor
Cc: kbuild, Nick Desaulniers, clang-built-linux, kbuild test robot, xfs
On Wed, 2019-10-30 at 08:45 -0700, Darrick J. Wong wrote:
> On Tue, Oct 29, 2019 at 08:39:25PM -0700, Nathan Chancellor wrote:
> > On Tue, Oct 29, 2019 at 02:45:40PM +0800, kbuild test robot wrote:
> > > CC: kbuild-all@lists.01.org
> > > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > > TO: Ian Kent <raven@themaw.net>
> > > CC: "Darrick J. Wong" <darrick.wong@oracle.com>
> > > CC: Christoph Hellwig <hch@lst.de>
>
> FYI, It's customary to cc the patch author [and the xfs list]...
>
> > > tree:
> > > https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
> > > mount-api-crash
> > > head: e35c37b1b9987c8d87d91dbeca6c24aade2a3390
> > > commit: a5a36409da3a608c815b38b0ff2eb5bcfc1adec6 [91/104] xfs:
> > > use super s_id instead of struct xfs_mount
> > > config: x86_64-rhel-7.6 (attached as .config)
> > > compiler: clang version 10.0.0 (git://gitmirror/llvm_project
> > > 7cd595df96d5929488063d8ff5cc3b5d800386da)
> > > reproduce:
> > > git checkout a5a36409da3a608c815b38b0ff2eb5bcfc1adec6
> > > # save the attached .config to linux build tree
> > > make ARCH=x86_64
> > >
> > > If you fix the issue, kindly add following tag
> > > Reported-by: kbuild test robot <lkp@intel.com>
> > >
> > > All warnings (new ones prefixed by >>):
> > >
> > > > > fs/xfs/xfs_message.c:23:40: warning: address of array 'mp-
> > > > > >m_super->s_id' will always evaluate to 'true' [-Wpointer-
> > > > > bool-conversion]
> > > if (mp && mp->m_super && mp->m_super->s_id) {
> > > ~~ ~~~~~~~~~~~~~^~~~
>
> ...so, Ian, I guess this isn't necessary ^^^^^^^^^^^^^^^^
> because it's a char array, not a pointer. :)
>
> Good catch!
Indeed, better now than later, ;)
>
> --D
>
> > > 1 warning generated.
> > >
> > > vim +23 fs/xfs/xfs_message.c
> > >
> > > 13
> > > 14 /*
> > > 15 * XFS logging functions
> > > 16 */
> > > 17 static void
> > > 18 __xfs_printk(
> > > 19 const char *level,
> > > 20 const struct xfs_mount *mp,
> > > 21 struct va_format *vaf)
> > > 22 {
> > > > 23 if (mp && mp->m_super && mp->m_super->s_id) {
> > > 24 printk("%sXFS (%s): %pV\n", level, mp-
> > > >m_super->s_id, vaf);
> > > 25 return;
> > > 26 }
> > > 27 printk("%sXFS: %pV\n", level, vaf);
> > > 28 }
> > > 29
> > >
> > > ---
> > > 0-DAY kernel test infrastructure Open Source
> > > Technology Center
> > > https://lists.01.org/pipermail/kbuild-all Intel
> > > Corporation
> > >
> >
> > Hi Darrick,
> >
> > The 0day team has been doing clang builds for us and we've been
> > forwarding the valid warnings along to developers. This appeared
> > after
> > the commit listed above. That check should be unnecessary, perhaps
> > you
> > meant to check for something else? Thanks for looking into this.
> >
> > Cheers,
> > Nathan
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-10-30 15:45 ` [djwong-xfs:mount-api-crash 91/104] fs/xfs/xfs_message.c:23:40: warning: address of array 'mp->m_super->s_id' will always evaluate to 'true' Darrick J. Wong
2019-10-30 15:48 ` Nathan Chancellor
2019-10-31 0:06 ` Ian Kent
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