From: Scott Wood <scottwood@freescale.com>
To: avorontsov@ru.mvista.com
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH RFC 0/7] "NAND on UPM" and related patches
Date: Wed, 12 Dec 2007 15:13:59 -0600 [thread overview]
Message-ID: <47604F17.8060403@freescale.com> (raw)
In-Reply-To: <47604D6E.1050200@freescale.com>
Scott Wood wrote:
> Anton Vorontsov wrote:
>> As the compromise I might suggest this: forbid pattern_start/pattern_end
>> from the ISRs (by marking them as might_sleep()), and replace _irqsave
>> spinlock with simple spinlock.
>
> No, you cannot use a bare spinlock with IRQs enabled. You'll deadlock
> on SMP, and you'll have races with preemption enabled.
Sorry, brain fart... obviously, with preemption on it'd disable
preemption even with a plain spinlock, and on SMP without preemption
it's not an issue.
Still, all you're getting rid of is the MSR twiddling, which should be
pretty minor.
-Scott
next prev parent reply other threads:[~2007-12-12 21:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-10 20:47 [PATCH RFC 0/7] "NAND on UPM" and related patches Anton Vorontsov
2007-12-10 20:48 ` [PATCH RFC 1/7] [POWERPC] Implement GPIO API embryo Anton Vorontsov
2007-12-12 16:48 ` Scott Wood
2007-12-12 17:10 ` Anton Vorontsov
2007-12-10 20:48 ` [PATCH RFC 2/7] [POWERPC] QE: implement GPIO API Anton Vorontsov
2007-12-10 20:48 ` [PATCH RFC 3/7] [POWERPC] CPM2: " Anton Vorontsov
2007-12-12 15:49 ` Jochen Friedrich
2007-12-12 16:03 ` Anton Vorontsov
2007-12-12 16:56 ` Scott Wood
2007-12-10 20:49 ` [PATCH RFC 4/7] [GPIO] Let drivers link if they support GPIO API as an addition Anton Vorontsov
2007-12-10 22:55 ` David Brownell
2007-12-10 23:04 ` Anton Vorontsov
2008-02-22 23:42 ` David Brownell
2008-02-22 23:35 ` Anton Vorontsov
2007-12-10 20:49 ` [PATCH RFC 5/7] [POWERPC] FSL UPM: routines to manage FSL UPMs Anton Vorontsov
2007-12-10 20:49 ` [PATCH RFC 6/7] [POWERPC][NAND] FSL UPM NAND driver Anton Vorontsov
2007-12-10 20:49 ` [PATCH RFC 7/7] [POWERPC] MPC8360E-RDK: add support for NAND on UPM Anton Vorontsov
2007-12-10 23:03 ` David Gibson
2007-12-10 23:16 ` Anton Vorontsov
2007-12-12 16:59 ` Scott Wood
2007-12-10 23:04 ` [PATCH RFC 0/7] "NAND on UPM" and related patches David Gibson
2007-12-10 23:10 ` Anton Vorontsov
2007-12-11 0:36 ` David Gibson
2007-12-12 12:47 ` Anton Vorontsov
2007-12-16 6:44 ` David Gibson
2007-12-12 16:39 ` Scott Wood
2007-12-12 16:40 ` Scott Wood
2007-12-12 16:55 ` Anton Vorontsov
2007-12-12 16:54 ` Scott Wood
2007-12-12 20:58 ` Anton Vorontsov
2007-12-12 21:06 ` Scott Wood
2007-12-12 21:13 ` Scott Wood [this message]
2007-12-13 14:09 ` Anton Vorontsov
2007-12-13 3:01 ` Chris Fester
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