linux-kernel - Re: [PATCH] task_work: return -EBUSY when adding same work

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Message-ID: <db2410e2-1f1a-b396-10d1-1df3ec061b78@kernel.dk>
Date:   Sun, 11 Jul 2021 20:44:20 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     zhenguo yao <yaozhenguo1@...il.com>
Cc:     oleg@...hat.com, linux-kernel@...r.kernel.org, yaozhenguo@...com
Subject: Re: [PATCH] task_work: return -EBUSY when adding same work

On 7/11/21 8:13 PM, zhenguo yao wrote:
> Yes I hit this condition.  The caller is queue_task_work in
> arch/x86/kernel/cpu/mce/core.c.
> It is really a BUG. I have submitted another patch to fix it:
> https://lkml.org/lkml/2021/7/9/186.

That patch seems broken, what happens if mce_kill_me is added already,
but it isn't the first work item in the list?

-- 
Jens Axboe