linux-kernel - Re: [dynticks:3.7-nohz1 5/25] arch/x86/kernel/apm_32.c:910:38: sparse: incorrect type in argument 3 (different modifiers)

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Date:	Sun, 23 Dec 2012 10:58:20 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Christopher Li <sparse@...isli.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [dynticks:3.7-nohz1 5/25] arch/x86/kernel/apm_32.c:910:38:
 sparse: incorrect type in argument 3 (different modifiers)

On Sat, Dec 22, 2012 at 07:11:49PM +0100, Frederic Weisbecker wrote:
> 2012/12/21 kbuild test robot <fengguang.wu@...el.com>:
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git 3.7-nohz1
> > head:   46209cdbb7d5346c29b2243c54b298a233684a5a
> > commit: 40d488f9fcd6840722402976f7a168e05819f526 [5/25] cputime: Use accessors to read task cputime stats
> >
> >
> > sparse warnings:
> >
> > + arch/x86/kernel/apm_32.c:910:38: sparse: incorrect type in argument 3 (different modifiers)
> > arch/x86/kernel/apm_32.c:910:38:    expected unsigned long [nocast] [usertype] *stime
> > arch/x86/kernel/apm_32.c:910:38:    got unsigned long *<noident>
> 
> Ok I must say I don't really understand this report. Do you have any
> hint on what it means?

It's possibly due to this "__nocast" modifier in the type definition:

typedef unsigned long __nocast cputime_t;

Not sure how to fix it though.

> 40d488f9 arch/x86/kernel/apm_32.c Frederic Weisbecker 2012-11-13  902   cputime_t stime;
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  903
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  904   int apm_idle_done = 0;
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  905   unsigned int jiffies_since_last_check = jiffies - last_jiffies;
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  906   unsigned int bucket;
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  907
> 99c63221 arch/x86/kernel/apm_32.c Len Brown           2011-04-01  908   WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
> ^1da177e arch/i386/kernel/apm.c   Linus Torvalds      2005-04-16  909  recalc:
> 40d488f9 arch/x86/kernel/apm_32.c Frederic Weisbecker 2012-11-13 @910   task_cputime(current, NULL, &stime);

Thanks,
Fengguang
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