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Date: Thu, 4 Apr 2013 09:42:09 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Tejun Heo <tj@...nel.org>
Cc: Christopher Li <sparse@...isli.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernel/workqueue.c:4434:61: sparse: expression using sizeof bool
CC Christopher and LKML.
On Wed, Apr 03, 2013 at 02:57:18PM -0700, Tejun Heo wrote:
> Hello, Fengguang.
Hi Tejun!
> On Sat, Mar 30, 2013 at 08:29:47PM +0800, kbuild test robot wrote:
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-better-dbg
> > head: ea44ca757342b769c176fd6d0b3fb525b22eeda9
> > commit: c04655aeae70173688bca4c62b35737ab6958e82 workqueue: include workqueue info when printing debug dump of a worker task
> > date: 10 hours ago
> >
> >
> > sparse warnings: (new ones prefixed by >>)
> >
> > kernel/workqueue.c:287:8: sparse: symbol 'cpu_worker_pools' was not declared. Should it be static?
> > kernel/workqueue.c:300:25: sparse: symbol 'system_highpri_wq' was not declared. Should it be static?
> > >> kernel/workqueue.c:4434:61: sparse: expression using sizeof bool
> > kernel/workqueue.c:2060:32: sparse: context imbalance in 'manage_workers' - unexpected unlock
> >
> > vim +4434 kernel/workqueue.c
> >
> ...
> > 4433 /* copy worker description */
> > > 4434 probe_kernel_read(&desc_valid, &worker->desc_valid, sizeof(desc_valid));
> > 4435 if (desc_valid)
>
> I don't know what to make of this warning. Yes, it's probing a bool
> variable and of course using sizeof(bool) to do that. Why does sparse
> complain about this?
I guess sparse warns on sizeof(bool) because it is compiler defined.
It may be 1, 4, or even 8 depending on the gcc version and platform.
Thanks,
Fengguang
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