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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47604F17.8060403@freescale.com \
--to=scottwood@freescale.com \
--cc=avorontsov@ru.mvista.com \
--cc=linuxppc-dev@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.