linux-kernel - Re: [2.6.28-rc1 regression] wmifinfo dockapp takes 100% of cpu (bisected)

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Date:	Sat, 25 Oct 2008 12:38:22 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	"Marcin Slusarz" <marcin.slusarz@...il.com>,
	"Carlos R. Mafra" <crmafra2@...il.com>,
	"Arjan van de Ven" <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.28-rc1 regression] wmifinfo dockapp takes 100% of cpu (bisected)

On Sat, Oct 25, 2008 at 12:12 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Sat, 25 Oct 2008 20:03:27 +0200
> Marcin Slusarz <marcin.slusarz@...il.com> wrote:
>> > >           if (copy_from_user(&tv, tvp, sizeof(tv)))
>> > >                   return -EFAULT;
>> > >
>> > > +         while (tv.tv_usec > USEC_PER_SEC && i < 1000) {
>>                                   ^
>> should be >=
>
> yeah thanks for catching that. Note to self: don't code before coffee
>
> I'm not very happy with a while loop; but at least it solves the problem
>
> I'll try to make it nicer than this ...

Regardless, you may wish to make a set_normalized_timeval and place it
in kernel/time.c right after the current set_nromalized_timespec.
Comparing the two, you'll also want to handle the case where tv_usec
is negative.
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