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

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Message-ID: <CA+icZUVmERfNzAMNBpOqvjcQSaCQe3izrK2=E4Rm05Y=1x==jQ@mail.gmail.com>
Date:	Mon, 22 Apr 2013 08:30:16 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	li guang <lig.fnst@...fujitsu.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

On Mon, Apr 22, 2013 at 8:22 AM, li guang <lig.fnst@...fujitsu.com> wrote:
> 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
>

Hmm, really this script memyselfandI as a result?

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

Andrew renamed data/csd,so it's only 1/2 needing a refresh.
Testing...

Regards,
- Sedat -

>>
>> 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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