From: Dipankar Sarma <dipankar@in.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: 2.5.38-mm2 [PATCH]
Date: Mon, 23 Sep 2002 23:03:40 +0530 [thread overview]
Message-ID: <20020923230340.A341@in.ibm.com> (raw)
In-Reply-To: <3D8F4139.6BB60A35@digeo.com>; from akpm@digeo.com on Mon, Sep 23, 2002 at 09:28:41AM -0700
On Mon, Sep 23, 2002 at 09:28:41AM -0700, Andrew Morton wrote:
> #ifdef CONFIG_PREEMPTION
> #define rcu_read_lock() preempt_disable()
> #define rcu_read_unlock() preempt_enable()
> #else
> #define rcu_read_lock() do {} while(0)
> #define rcu_read_unlock() do {} while(0)
> #endif
>
> with
>
> #define rcu_read_lock() preempt_disable()
> #define rcu_read_unlock() preempt_enable()
>
> because preempt_disable() is a no-op on CONFIG_PREEMPT=n anyway.
This is fine. The original rcu_ltimer patch needed #ifdef CONFIG_PREEMPT,
so that it could be easily used with 2.4. With preemption in 2.5,
rcu_read_xxx() can be preempt_xxx().
Thanks
--
Dipankar Sarma <dipankar@in.ibm.com> http://lse.sourceforge.net
Linux Technology Center, IBM Software Lab, Bangalore, India.
WARNING: multiple messages have this Message-ID (diff)
From: Dipankar Sarma <dipankar@in.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: 2.5.38-mm2 [PATCH]
Date: Mon, 23 Sep 2002 23:03:40 +0530 [thread overview]
Message-ID: <20020923230340.A341@in.ibm.com> (raw)
In-Reply-To: <3D8F4139.6BB60A35@digeo.com>; from akpm@digeo.com on Mon, Sep 23, 2002 at 09:28:41AM -0700
On Mon, Sep 23, 2002 at 09:28:41AM -0700, Andrew Morton wrote:
> #ifdef CONFIG_PREEMPTION
> #define rcu_read_lock() preempt_disable()
> #define rcu_read_unlock() preempt_enable()
> #else
> #define rcu_read_lock() do {} while(0)
> #define rcu_read_unlock() do {} while(0)
> #endif
>
> with
>
> #define rcu_read_lock() preempt_disable()
> #define rcu_read_unlock() preempt_enable()
>
> because preempt_disable() is a no-op on CONFIG_PREEMPT=n anyway.
This is fine. The original rcu_ltimer patch needed #ifdef CONFIG_PREEMPT,
so that it could be easily used with 2.4. With preemption in 2.5,
rcu_read_xxx() can be preempt_xxx().
Thanks
--
Dipankar Sarma <dipankar@in.ibm.com> http://lse.sourceforge.net
Linux Technology Center, IBM Software Lab, Bangalore, India.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/
next prev parent reply other threads:[~2002-09-23 19:11 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-23 4:20 2.5.38-mm2 Andrew Morton
2002-09-23 4:20 ` 2.5.38-mm2 Andrew Morton
2002-09-23 7:16 ` 2.5.38-mm2 Jens Axboe
2002-09-23 7:16 ` 2.5.38-mm2 Jens Axboe
2002-09-23 7:43 ` 2.5.38-mm2 Andrew Morton
2002-09-23 7:43 ` 2.5.38-mm2 Andrew Morton
2002-09-24 21:10 ` 2.5.38-mm2 Bill Davidsen
2002-09-24 21:10 ` 2.5.38-mm2 Bill Davidsen
2002-09-23 9:45 ` 2.5.38-mm2 [PATCH] Dipankar Sarma
2002-09-23 9:45 ` Dipankar Sarma
2002-09-23 16:28 ` Andrew Morton
2002-09-23 16:28 ` Andrew Morton
2002-09-23 17:33 ` Dipankar Sarma [this message]
2002-09-23 17:33 ` Dipankar Sarma
2002-09-24 4:41 ` Rusty Russell
2002-09-24 4:41 ` Rusty Russell
2002-09-24 10:24 ` Dipankar Sarma
2002-09-24 10:24 ` Dipankar Sarma
2002-09-24 14:56 ` Rusty Russell
2002-09-24 14:56 ` Rusty Russell
2002-09-23 9:56 ` 2.5.38-mm2 [PATCH] (dcache) Dipankar Sarma
2002-09-23 9:56 ` Dipankar Sarma
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