From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Joerg Roedel <joerg.roedel@amd.com>,
tom.leiming@gmail.com, fujita.tomonori@lab.ntt.co.jp,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH][RFC] asm-generic:remove calling flush_write_buffers() in dma_sync_*_for_cpu
Date: Mon, 29 Jun 2009 17:31:21 +0100 [thread overview]
Message-ID: <20090629173121.768f2923@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <200906291822.18334.arnd@arndb.de>
> Wouldn't it be better to put the flush_write_buffer in the specific
> operation (swiotlb_sync_*_for_*) rather than the multiplexer?
>
> Maybe in that case, smp_wmb() would be more appropriate because
> it is defined on all architectures.
smp_wmb() is stronger and it would slow down x86 if we did that (we'd go
from no-op on a coherent platform to using mfence/lfence etc)
next prev parent reply other threads:[~2009-06-29 16:30 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-28 14:39 tom.leiming
2009-06-28 15:34 ` Arnd Bergmann
2009-06-29 12:31 ` Joerg Roedel
2009-06-29 13:51 ` Ming Lei
2009-06-29 14:45 ` Joerg Roedel
2009-06-29 14:54 ` Ming Lei
2009-06-29 15:44 ` Joerg Roedel
2009-06-29 16:22 ` Arnd Bergmann
2009-06-29 16:31 ` Alan Cox [this message]
2009-06-29 16:45 ` Arnd Bergmann
2009-06-29 17:16 ` Alan Cox
2009-06-30 12:34 ` Arnd Bergmann
2009-06-30 12:40 ` Alan Cox
2009-06-30 12:48 ` Arnd Bergmann
2009-06-30 13:09 ` Alan Cox
2009-06-30 13:38 ` Arnd Bergmann
2009-07-07 1:54 ` Ming Lei
2009-07-07 7:48 ` Russell King - ARM Linux
2009-07-07 13:43 ` Ming Lei
2009-07-07 14:06 ` Arnd Bergmann
2009-07-07 14:55 ` Ming Lei
2009-07-07 15:30 ` Arnd Bergmann
2009-07-07 17:36 ` Russell King - ARM Linux
2009-07-07 17:33 ` Russell King - ARM Linux
2009-06-29 18:47 ` Joerg Roedel
2009-06-29 19:10 ` Alan Cox
2009-06-29 19:24 ` Joerg Roedel
2009-06-29 18:48 ` Joerg Roedel
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