linux-kernel - Re: [PATCH, RFC] reimplement flush

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Message-ID: <20070105090347.GC18088@in.ibm.com>
Date:	Fri, 5 Jan 2007 14:33:47 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>
Subject: Re: [PATCH, RFC] reimplement flush_workqueue()

On Thu, Jan 04, 2007 at 10:31:07AM -0800, Andrew Morton wrote:
> But before we do much more of this we should have a wrapper.  Umm
> 
> static inline void block_cpu_hotplug(void)
> {
> 	preempt_disable();
> }

Nack.

This will only block cpu down, not cpu_up and hence is a misnomer. I would be 
vary of ignoring cpu_up events totally in writing hotplug safe code.

-- 
Regards,
vatsa
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