From: Ingo Molnar <mingo@elte.hu>
To: Jiri Olsa <jolsa@redhat.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
fbl@redhat.com, nhorman@redhat.com, davem@redhat.com,
htejun@gmail.com, jarkao2@gmail.com, oleg@redhat.com,
davidel@xmailserver.org, eric.dumazet@gmail.com
Subject: Re: [PATCHv5 2/2] memory barrier: adding smp_mb__after_lock
Date: Fri, 3 Jul 2009 11:06:06 +0200 [thread overview]
Message-ID: <20090703090606.GA3902@elte.hu> (raw)
In-Reply-To: <20090703081445.GG2902@jolsa.lab.eng.brq.redhat.com>
* Jiri Olsa <jolsa@redhat.com> wrote:
> +++ b/arch/x86/include/asm/spinlock.h
> @@ -302,4 +302,7 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
> #define _raw_read_relax(lock) cpu_relax()
> #define _raw_write_relax(lock) cpu_relax()
>
> +/* The {read|write|spin}_lock() on x86 are full memory barriers. */
> +#define smp_mb__after_lock() do { } while (0)
Two small stylistic comments, please make this an inline function:
static inline void smp_mb__after_lock(void) { }
#define smp_mb__after_lock
(untested)
> +/* The lock does not imply full memory barrier. */
> +#ifndef smp_mb__after_lock
> +#define smp_mb__after_lock() smp_mb()
> +#endif
ditto.
Ingo
next prev parent reply other threads:[~2009-07-03 9:06 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-03 8:12 [PATCHv5 0/2] net: fix race in the receive/select Jiri Olsa
2009-07-03 8:13 ` [PATCHv5 1/2] net: adding memory barrier to the poll and receive callbacks Jiri Olsa
2009-07-07 15:56 ` Eric Dumazet
2009-07-03 8:14 ` [PATCHv5 2/2] memory barrier: adding smp_mb__after_lock Jiri Olsa
2009-07-03 9:06 ` Ingo Molnar [this message]
2009-07-03 9:20 ` Eric Dumazet
2009-07-03 9:24 ` Ingo Molnar
2009-07-03 9:56 ` Jiri Olsa
2009-07-03 10:25 ` Ingo Molnar
2009-07-03 11:18 ` Jiri Olsa
2009-07-03 11:30 ` Jarek Poplawski
2009-07-03 11:43 ` Jiri Olsa
2009-07-07 10:18 ` Jiri Olsa
2009-07-07 13:46 ` Jiri Olsa
2009-07-07 14:01 ` Mathieu Desnoyers
2009-07-07 14:34 ` Oleg Nesterov
2009-07-07 15:04 ` Mathieu Desnoyers
2009-07-07 15:44 ` Oleg Nesterov
2009-07-07 15:50 ` Peter Zijlstra
2009-07-07 19:45 ` Mathieu Desnoyers
2009-07-07 22:44 ` Eric Dumazet
2009-07-07 23:28 ` Mathieu Desnoyers
2009-07-07 23:51 ` Oleg Nesterov
2009-07-08 4:34 ` Mathieu Desnoyers
2009-07-08 7:18 ` Jarek Poplawski
2009-07-07 14:34 ` Jiri Olsa
2009-07-07 14:42 ` Eric Dumazet
2009-07-07 14:57 ` Mathieu Desnoyers
2009-07-07 15:23 ` Eric Dumazet
2009-07-08 17:47 ` Jiri Olsa
2009-07-08 18:07 ` David Miller
2009-07-08 18:16 ` Jiri Olsa
2009-07-03 14:04 ` Mathieu Desnoyers
2009-07-03 15:29 ` Herbert Xu
2009-07-03 15:37 ` Eric Dumazet
2009-07-03 15:47 ` Mathieu Desnoyers
2009-07-03 17:06 ` Paul E. McKenney
2009-07-03 17:31 ` Mathieu Desnoyers
2009-07-03 15:40 ` Mathieu Desnoyers
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