From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
Yinghai Lu <yinghai@kernel.org>, Avi Kivity <avi@redhat.com>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
cpufreq@vger.kernel.org
Subject: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =
Date: Tue, 9 Jun 2009 12:28:08 -0400 [thread overview]
Message-ID: <20090609162808.GC2491@redhat.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0906090842120.6847@localhost.localdomain>
On Tue, Jun 09, 2009 at 08:46:44AM -0700, Linus Torvalds wrote:
> Please STOP USING THAT HORRIBLE "work_on_cpu()" crap.
>
> Is there any reason you do that? We've had to fix up the fallout from that
> kind of crazy crap several times.
>
> Just use a regular IPI. Use "smp_call_function_[single|many]()" instead.
>
> See for example commit 01599fca6758d2cd133e78f87426fc851c9ea725, where
> another "work_on_cpu()" thing was broken.
>
> I don't understand why you guys keep on using that _known_ bad function.
> The whole point of "work_on_cpu()" is for big, slow, and rare things. Not
> as a random "let's make that CPU do this".
>
> So stop it.
work_on_cpu()'s definition could probably use a fat comment describing
why it sucks.
Dave
next prev parent reply other threads:[~2009-06-09 16:37 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-04 21:00 [PATCH] kvm: fix kvm reboot crash when MAXSMP is used Yinghai Lu
2009-06-04 21:01 ` [PATCH] cpumask: alloc blank cpumask left over Yinghai Lu
2009-06-05 4:58 ` Rusty Russell
2009-06-05 5:18 ` Avi Kivity
2009-06-05 5:56 ` Yinghai Lu
2009-06-05 13:41 ` Rusty Russell
2009-06-05 17:34 ` Linus Torvalds
2009-06-05 17:46 ` Yinghai Lu
2009-06-05 17:57 ` Yinghai Lu
2009-06-06 23:40 ` Rusty Russell
2009-06-06 23:43 ` Rusty Russell
2009-06-06 9:22 ` Avi Kivity
2009-06-06 9:36 ` Yinghai Lu
2009-06-06 9:39 ` Avi Kivity
2009-06-06 10:57 ` Yinghai Lu
2009-06-06 21:50 ` [PATCH 1/6] cpumask: introduce zalloc_cpumask_var Yinghai Lu
2009-06-06 21:51 ` Subject: [PATCH 2/6] cpumask: alloc zeroed cpumask for static cpumask_var_ts Yinghai Lu
2009-06-06 21:52 ` [PATCH 3/6] kvm: fix kvm reboot crash when MAXSMP is used Yinghai Lu
2009-06-06 21:53 ` [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of = Yinghai Lu
2009-06-09 6:57 ` Rusty Russell
2009-06-09 8:13 ` Yinghai Lu
2009-06-10 4:20 ` Rusty Russell
2009-06-10 13:39 ` Dave Jones
2009-06-10 17:01 ` Ingo Molnar
2009-06-09 15:46 ` Linus Torvalds
2009-06-09 16:28 ` Dave Jones [this message]
2009-06-09 16:41 ` Linus Torvalds
2009-06-10 4:55 ` Rusty Russell
2009-06-10 6:22 ` Rusty Russell
2009-06-10 11:10 ` S06cpuspeed/2637 is trying to acquire lock (&(&dbs_info->work)->work (was: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =) Ingo Molnar
2009-06-10 20:58 ` Dave Jones
2009-06-11 10:52 ` Ingo Molnar
2009-06-20 12:48 ` Ingo Molnar
2009-06-21 19:55 ` Thomas Renninger
2009-06-23 18:17 ` [PATCH] cpufreq: remove dbs_mutex Ingo Molnar
2009-06-23 18:40 ` Ingo Molnar
2009-06-23 18:51 ` Pallipadi, Venkatesh
2009-06-23 19:14 ` Ingo Molnar
2009-06-23 19:24 ` Pallipadi, Venkatesh
2009-06-23 19:32 ` Ingo Molnar
[not found] ` <20090623193215.GA31374-X9Un+BFzKDI@public.gmane.org>
2009-06-25 14:01 ` Fix dead lock in cpufreq for CPU hotplug and suspend for 2.6.30.stable Thomas Renninger
2009-06-25 14:01 ` Thomas Renninger
[not found] ` <1245938485-12663-1-git-send-email-trenn-l3A5Bk7waGM@public.gmane.org>
2009-06-25 14:06 ` Thomas Renninger
2009-06-25 14:06 ` Thomas Renninger
2009-06-25 14:01 ` [PATCH 1/2] CPUFREQ: Remove unneeded dbs_mutexes from ondemand and conservative governors Thomas Renninger
[not found] ` <1245938485-12663-2-git-send-email-trenn-l3A5Bk7waGM@public.gmane.org>
2009-06-25 14:25 ` Mathieu Desnoyers
2009-06-25 14:25 ` Mathieu Desnoyers
2009-06-25 15:03 ` Pallipadi, Venkatesh
2009-06-25 15:03 ` Pallipadi, Venkatesh
2009-06-25 22:17 ` Thomas Renninger
2009-06-25 22:17 ` Thomas Renninger
[not found] ` <200906260017.10730.trenn-l3A5Bk7waGM@public.gmane.org>
2009-06-25 22:26 ` Thomas Renninger
2009-06-25 22:26 ` Thomas Renninger
2009-06-30 6:33 ` Pavel Machek
2009-06-30 6:33 ` Pavel Machek
[not found] ` <20090630063339.GF1351-+ZI9xUNit7I@public.gmane.org>
2009-07-03 10:10 ` Thomas Renninger
2009-07-03 10:10 ` Thomas Renninger
2009-07-05 19:46 ` Pavel Machek
2009-06-30 22:58 ` [stable] " Greg KH
2009-06-30 22:58 ` Greg KH
[not found] ` <20090630225813.GB2634-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2009-06-30 23:14 ` Mathieu Desnoyers
2009-06-30 23:14 ` Mathieu Desnoyers
2009-06-30 23:39 ` Greg KH
2009-06-30 23:39 ` Greg KH
[not found] ` <20090630233912.GA3709-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2009-07-01 9:07 ` Thomas Renninger
2009-07-01 9:07 ` Thomas Renninger
2009-06-25 14:01 ` [PATCH 2/2] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site) Thomas Renninger
2009-06-10 19:42 ` [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of = Langsdorf, Mark
2009-06-11 2:34 ` Rusty Russell
2009-09-21 16:44 ` Langsdorf, Mark
2009-06-06 21:55 ` [PATCH 5/6] core: use cpumask_copy instead of = for cpus_allowed in fork Yinghai Lu
2009-06-06 21:56 ` [PATCH 6/6] x86/cpufreq: don't use SPEEDSTEP with MAXSMP Yinghai Lu
2009-06-06 21:56 ` [PATCH 1/6] cpumask: introduce zalloc_cpumask_var Andrew Morton
2009-06-06 22:07 ` Yinghai Lu
2009-06-06 21:58 ` Linus Torvalds
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