linux-kernel - Re: [PATCH] percpu_ida: Handle out-of-tags gracefully

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Message-ID: <53208851.8080103@acm.org>
Date:	Wed, 12 Mar 2014 17:16:17 +0100
From:	Bart Van Assche <bvanassche@....org>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	Jens Axboe <axboe@...nel.dk>, Kent Overstreet <kmo@...erainc.com>,
	Shaohua Li <shli@...nel.org>, Christoph Hellwig <hch@....de>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] percpu_ida: Handle out-of-tags gracefully

On 03/12/14 16:21, Alexander Gordeev wrote:
> While 'remote->nr_free' could be dropped on another CPU it still does not
> explain how steal_tags() enters the loop, but fails to locate 'cpus_have_tags'
> count of bits.
> 
> So although v2 of your patch fixes the crash it does not address the root
> cause IMHO.

Hmm ... you are probably right. I will analyze this further and see what
I can come up with.

Bart.

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