From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: Nick Piggin <npiggin@suse.de>, Jens Axboe <jens.axboe@oracle.com>,
linux-kernel@vger.kernel.org, peterz@infradead.org,
linux-arch@vger.kernel.org, jeremy@goop.org, mingo@elte.hu
Subject: Re: [PATCH 1/10] Add generic helpers for arch IPI function calls
Date: Fri, 2 May 2008 06:09:22 -0700 [thread overview]
Message-ID: <20080502130922.GC15522@linux.vnet.ibm.com> (raw)
In-Reply-To: <27854.1209732644@ocs10w>
On Fri, May 02, 2008 at 10:50:44PM +1000, Keith Owens wrote:
> "Paul E. McKenney" (on Fri, 2 May 2008 05:29:55 -0700) wrote:
> >OK -- for some reason, I was thinking that it was illegal to
> >invoke smp_call_function() with irqs disabled...
> >
> >Ah, I see it -- smp_call_function_mask() says:
> >
> > * You must not call this function with disabled interrupts or from a
> > * hardware interrupt handler or from a bottom half handler.
> >
> >So we have no problem with smp_call_function, then.
> >
> >OK, so smp_call_function() -can- be invoked with irqs disabled?
> >Hmmm... I will give this some thought.
>
> Doing any smp_call_function with interrupts disabled is a potential
> deadlock. See http://lkml.org/lkml/2004/5/2/116.
OK, cool, thank you for the confirmation!
Therefore, when you call smp_call_function(), you may get calls from
other CPUs showing up, and therefore my polling approach does not
introduce any new strands of spaghetti. ;-)
Thanx, Paul
next prev parent reply other threads:[~2008-05-02 13:09 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-29 7:26 [PATCH 0/10] Add generic helpers for arch IPI function calls #3 Jens Axboe
2008-04-29 7:26 ` Jens Axboe
[not found] ` <1209453990-7735-1-git-send-email-jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2008-04-29 7:26 ` [PATCH 1/10] Add generic helpers for arch IPI function calls Jens Axboe
2008-04-29 7:26 ` Jens Axboe
[not found] ` <1209453990-7735-2-git-send-email-jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2008-04-29 13:59 ` Paul E. McKenney
2008-04-29 13:59 ` Paul E. McKenney
[not found] ` <20080429135936.GC12390-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2008-04-30 11:29 ` Paul E. McKenney
2008-04-30 11:29 ` Paul E. McKenney
[not found] ` <20080430112934.GA23203-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2008-04-30 11:34 ` Jens Axboe
2008-04-30 11:34 ` Jens Axboe
[not found] ` <20080430113456.GY12774-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2008-04-30 12:17 ` Paul E. McKenney
2008-04-30 12:17 ` Paul E. McKenney
[not found] ` <20080430121712.GR11126-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2008-04-30 12:37 ` Jens Axboe
2008-04-30 12:37 ` Jens Axboe
[not found] ` <20080430123717.GC12774-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2008-05-01 2:44 ` Paul E. McKenney
2008-05-01 2:44 ` Paul E. McKenney
2008-05-02 2:02 ` Paul E. McKenney
2008-05-02 2:12 ` Nick Piggin
2008-05-02 12:29 ` Paul E. McKenney
2008-05-02 12:42 ` Paul E. McKenney
2008-05-02 12:59 ` Peter Zijlstra
2008-05-02 12:59 ` Peter Zijlstra
2008-05-02 14:21 ` Paul E. McKenney
2008-05-02 14:21 ` Paul E. McKenney
2008-05-03 2:30 ` Paul E. McKenney
2008-05-03 5:49 ` Nick Piggin
2008-05-03 18:11 ` Paul E. McKenney
2008-05-04 22:04 ` Paul E. McKenney
2008-05-05 4:15 ` Nick Piggin
2008-05-05 4:15 ` Nick Piggin
2008-05-05 17:43 ` Paul E. McKenney
2008-05-07 20:42 ` Jens Axboe
2008-05-08 4:36 ` Paul E. McKenney
2008-05-02 12:50 ` Keith Owens
2008-05-02 13:09 ` Paul E. McKenney [this message]
2008-04-30 22:56 ` Jeremy Fitzhardinge
2008-04-30 22:56 ` Jeremy Fitzhardinge
2008-04-29 7:26 ` [PATCH 2/10] x86: convert to generic helpers for " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
[not found] ` <1209453990-7735-3-git-send-email-jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2008-04-29 20:35 ` Jeremy Fitzhardinge
2008-04-29 20:35 ` Jeremy Fitzhardinge
[not found] ` <481786A5.7010604-TSDbQ3PG+2Y@public.gmane.org>
2008-04-30 11:35 ` Jens Axboe
2008-04-30 11:35 ` Jens Axboe
[not found] ` <20080430113542.GZ12774-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2008-04-30 12:20 ` Paul E. McKenney
2008-04-30 12:20 ` Paul E. McKenney
[not found] ` <20080430122001.GS11126-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2008-04-30 12:31 ` Jens Axboe
2008-04-30 12:31 ` Jens Axboe
[not found] ` <20080430123136.GB12774-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2008-04-30 14:51 ` Jeremy Fitzhardinge
2008-04-30 14:51 ` Jeremy Fitzhardinge
2008-04-30 21:39 ` Jeremy Fitzhardinge
2008-04-30 21:39 ` Jeremy Fitzhardinge
2008-04-29 7:26 ` [PATCH 3/10] powerpc: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 4/10] ia64: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 5/10] alpha: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 6/10] arm: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 7/10] m32r: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 8/10] mips: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 9/10] parisc: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
2008-04-29 7:26 ` [PATCH 10/10] sh: " Jens Axboe
2008-04-29 7:26 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2008-05-29 8:58 [PATCH 0/10] Add generic helpers for arch IPI function calls #4 Jens Axboe
2008-05-29 8:58 ` [PATCH 1/10] Add generic helpers for arch IPI function calls Jens Axboe
2008-05-30 11:24 ` Paul E. McKenney
2008-06-06 8:44 ` Jens Axboe
2008-06-10 14:51 ` Catalin Marinas
2008-06-10 15:44 ` James Bottomley
2008-06-10 16:04 ` Catalin Marinas
2008-06-10 15:47 ` Paul E. McKenney
2008-06-10 16:53 ` Catalin Marinas
2008-06-11 3:25 ` Nick Piggin
2008-06-11 10:13 ` Catalin Marinas
2008-06-11 10:13 ` Catalin Marinas
2008-07-06 17:21 ` Jeremy Fitzhardinge
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=20080502130922.GC15522@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=jens.axboe@oracle.com \
--cc=jeremy@goop.org \
--cc=kaos@ocs.com.au \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=npiggin@suse.de \
--cc=peterz@infradead.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).