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Message-ID: <20150512131941.GL11388@htj.duckdns.org> Date: Tue, 12 May 2015 09:19:41 -0400 From: Tejun Heo <tj@...nel.org> To: Lai Jiangshan <laijs@...fujitsu.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/5] workqueue: ensure attrs-changing be sequentially Hello, On Tue, May 12, 2015 at 01:09:50PM +0800, Lai Jiangshan wrote: > On 05/11/2015 10:55 PM, Tejun Heo wrote: > >> > >> Process A (change cpumask) | Process B (change numa affinity) > >> wq_cpumask_store() | > >> wq_sysfs_prep_attrs() | > > ^ > > misaligned > > It is aligned in email, misaligned in quoted email, and misaligned > in `git log` and `git show`, aligned in `git commit` when I wrote > the changelog. > > I will just remove all the |. Hmmm... I wonder why that is. It looks consistently misaligned here. If in doubt, just use spaces instead of tabs when drawing stuff. ... > >> Sequential model on non-performance-sensitive operations is more popular > >> and preferred. So this patch moves wq_sysfs_prep_attrs() into the protection > > > > You can just say the previous behavior is buggy. > > It depends on definitions. To me, it is just a nuisance. I find this pretty difficult to agree with. A does an operation which changes attribute 1. B independently tries to change attribute 2. Depending on the sequence, we end up with three different results. How is this not a bug? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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