linux-kernel - RE: [PATCH] kernel: async: Fixed the wrong waitting condition of wait

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Message-ID: <4fdc864411a24125b49ca66989011928@SHMBX02.spreadtrum.com>
Date:	Thu, 8 Jan 2015 06:20:35 +0000
From:	Chunyan Zhang (张春艳) 
	<Chunyan.Zhang@...eadtrum.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"ionut.m.alexa@...il.com" <ionut.m.alexa@...il.com>,
	Mark Yang (杨永辉) <Mark.Yang@...eadtrum.com>,
	Wei Qiao (乔伟) <Wei.Qiao@...eadtrum.com>,
	Geng Ren (任赓) <Geng.Ren@...eadtrum.com>,
	Orson Zhai (翟京) <Orson.Zhai@...eadtrum.com>,
	Zhizhou Zhang (张治洲) 
	<Zhizhou.Zhang@...eadtrum.com>,
	Ke Wang (王科) <Ke.Wang@...eadtrum.com>,
	"zhang.lyra@...il.com" <zhang.lyra@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"Tejun Heo" <tj@...nel.org>
Subject: RE: [PATCH] kernel: async: Fixed the wrong waitting condition of
 wait_event

Hi, Andrew

Could you give us the test log including the runtime problems you've got?

Thank you so much.


Best regards
Chunyan

On Mon, 5 Jan 2015 11:35:35 +0800 Chunyan Zhang <chunyan.zhang@...eadtrum.com> wrote:

> This patch changes the waitting condition of wait_event in the
> function 'async_synchronize_cookie_domain'.
>
> This function waits until all asynchronous function calls for the certain
> domain have been done.
>
> But, the function 'lowest_in_progress' returns the lowest *pending*
> entry's cookie.
>
> So we should make sure that the return value of lowest_in_progress(domain)
> must be larger than @cookie.

I'm having runtime problems with this.  Twice the kernel silently hangs
late in initcalls and the third time I got a great stream of oopses.

I'll drop it.  Hopefully you'll be able to work through the bug with
Arjan and Tejun.