linux-kernel - Re: [PATCH 1/2] smp: use '|=' for csd

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Message-ID: <1366611749.27110.6.camel@liguang.fnst.cn.fujitsu.com>
Date:	Mon, 22 Apr 2013 14:22:29 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	sedat.dilek@...il.com
Cc:	tglx@...utronix.de, peterz@...radead.org,
	akpm@...ux-foundation.org, shli@...ionio.com,
	srivatsa.bhat@...ux.vnet.ibm.com, suresh.b.siddha@...el.com,
	fweisbec@...il.com, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] smp: use '|=' for csd_lock

在 2013-04-22一的 08:18 +0200，Sedat Dilek写道：
> On Mon, Apr 22, 2013 at 7:47 AM, liguang <lig.fnst@...fujitsu.com> wrote:
> > originally, 'data->flags = CSD_FLAG_LOCK',
> > and we use 'data->flags &= ~CSD_FLAG_LOCK'
> > for csd_unlock, they are not symmetrix operations
> > so use '|=' instead of '='.
> > though, now data->flags only hold CSD_FLAG_LOCK,
> > it's not so meaningful to use '|=' to set 1 bit,
> > and '&= ~' to clear 1 bit.
> >
> 
> Hi,
> 
> what's the reason I got CCed on this two patches? The ipc-sem-next
> issue I reported?

sorry,
just use the result of scripts/get_maintainer.pl

> 
> Against what tree are those patches?
> They are not compatible with Linux-Next (next-20130419).

main

> 
> Thanks.
> 
> Regards,
> - Sedat -
> 
> [1] http://marc.info/?t=136631457900005&r=1&w=2
> 
> > Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> > ---
> >  kernel/smp.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/kernel/smp.c b/kernel/smp.c
> > index 1818dc0..2d5deb4 100644
> > --- a/kernel/smp.c
> > +++ b/kernel/smp.c
> > @@ -109,7 +109,7 @@ static void csd_lock_wait(struct call_single_data *data)
> >  static void csd_lock(struct call_single_data *data)
> >  {
> >         csd_lock_wait(data);
> > -       data->flags = CSD_FLAG_LOCK;
> > +       data->flags |= CSD_FLAG_LOCK;
> >
> >         /*
> >          * prevent CPU from reordering the above assignment
> > --
> > 1.7.2.5
> >


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