From: Tejun Heo <htejun@gmail.com>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Dave Miller <davem@redhat.com>,
axboe@suse.de, bzolnier@gmail.com, jgarzik@pobox.com,
linux-kernel@vger.kernel.org, mattjreimer@gmail.com,
rmk+lkml@arm.linux.org.uk
Subject: Re: [PATCHSET] block: fix PIO cache coherency bug
Date: Tue, 21 Mar 2006 01:40:43 +0900 [thread overview]
Message-ID: <441EDB0B.3050805@gmail.com> (raw)
In-Reply-To: <1142872412.3283.24.camel@mulgrave.il.steeleye.com>
James Bottomley wrote:
> On Tue, 2006-03-21 at 01:26 +0900, Tejun Heo wrote:
>> Okay by me, although I think we also need to fix flush_dcache_page()
>> such that it doesn't abruptly enable irq after itself. That's just
>> broken. I'll make some kmap wrappers such that callers don't have to try
>> too hard to get synchronization correct.
>
> That would involve fixing all of the flush_dcache_mmap_lock/unlock()
> wrappers to take an extra flags variable (which would be unused on null
> implementations) ... it can be done, but it's a lot of work; I think,
> since all the current users aren't in atomic context, that we shouldn't
> bother unless anyone can see a real need to call it from atomic context.
>
Hmmm... if fixing is too much work, how about adding WARN_ON() or one of
its friends if we enter flush_dcache_page() from atomic context?
--
tejun
next prev parent reply other threads:[~2006-03-20 16:41 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-13 15:24 [PATCHSET] block: fix PIO cache coherency bug Tejun Heo
2006-01-13 15:24 ` [PATCH 3/8] block: convert bio kmap helpers to use blk_kmap helpers Tejun Heo
2006-01-13 15:24 ` [PATCH 4/8] block: convert IDE " Tejun Heo
2006-02-14 19:07 ` Matt Reimer
2006-02-15 2:05 ` Tejun Heo
2006-02-16 18:01 ` Russell King
2006-02-16 18:10 ` Linus Torvalds
2006-02-16 19:02 ` Russell King
2006-01-13 15:24 ` [PATCH 2/8] block: implement blk kmap helpers Tejun Heo
2006-01-13 15:24 ` [PATCH 1/8] highmem: include asm/kmap_types.h in linux/highmem.h Tejun Heo
2006-01-13 15:24 ` [PATCH 5/8] block: convert libata to use blk_kmap helpers Tejun Heo
2006-01-13 15:24 ` [PATCH 6/8] block: convert scsi " Tejun Heo
2006-01-13 15:24 ` [PATCH 8/8] block: convert md " Tejun Heo
2006-01-13 15:24 ` [PATCH 7/8] block: convert block/rd.c " Tejun Heo
2006-01-13 15:37 ` [PATCHSET] block: fix PIO cache coherency bug Jens Axboe
2006-01-13 15:47 ` Bartlomiej Zolnierkiewicz
2006-01-13 15:50 ` James Bottomley
2006-01-13 18:20 ` Russell King
2006-01-13 18:35 ` James Bottomley
2006-01-13 19:06 ` Russell King
2006-02-22 8:27 ` Tejun Heo
2006-03-02 18:46 ` James Bottomley
2006-03-02 20:30 ` Russell King
2006-03-02 20:43 ` James Bottomley
2006-03-02 20:57 ` Russell King
2006-03-02 20:44 ` Jens Axboe
2006-05-29 19:17 ` Nicolas Pitre
2006-05-30 11:19 ` Tejun Heo
2006-05-30 21:07 ` Guennadi Liakhovetski
2006-05-30 21:32 ` Nicolas Pitre
2006-05-31 0:57 ` David S. Miller
2006-03-02 20:40 ` Jens Axboe
2006-03-20 16:12 ` James Bottomley
2006-03-20 16:26 ` Tejun Heo
2006-03-20 16:33 ` James Bottomley
2006-03-20 16:40 ` Tejun Heo [this message]
2006-03-20 16:48 ` James Bottomley
2006-03-23 14:23 ` James Bottomley
2006-03-20 16:50 ` Randy.Dunlap
2006-03-20 16:52 ` James Bottomley
2006-01-13 22:02 ` Russell King
2006-01-13 22:38 ` James Bottomley
2006-01-13 22:43 ` David S. Miller
2006-01-14 4:58 ` James Bottomley
2006-01-17 15:00 ` Jeff Garzik
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