linux-kernel - Re: + work_on_cpu-rewrite-it-to-create-a-kernel-thread-on-demand.patch added to -mm tree

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Message-ID: <m18wobcrw3.fsf@fess.ebiederm.org>
Date:	Thu, 12 Feb 2009 12:38:36 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	mingo@...e.hu, linux-kernel@...r.kernel.org, oleg@...hat.com,
	travis@....com, a.p.zijlstra@...llo.nl, mm-commits@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: + work_on_cpu-rewrite-it-to-create-a-kernel-thread-on-demand.patch  added to -mm tree

Andrew Morton <akpm@...ux-foundation.org> writes:
>
> Series of four patches:
>
> - switch cstate.c frmo work_on_cpu to smp_call_function_single()
>
> - ditto acpi-cpufreq.c
>
> - ditto mce_amd_64.c
>
> The final work_on_cpu() caller is pci_call_probe().  I'd like to find a
> way of removing that callsite as well, so we can finally remove this
> turkey but for now, just fix the bugs in it:

As far as I can tell when we are doing the probes we are in a function
that can sleep, so we should be able to just call set_cpus_allowed to
remove the need for work_on_cpu in pci_call_probe.  Possibly with a
save/restore of the allowed cpus.

Am I missing something?

Eric


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