From: Andrew Morton <akpm@linux-foundation.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: cgel.zte@gmail.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, chiminghao <chi.minghao@zte.com.cn>,
Zeal Robot <zealci@zte.com.cn>
Subject: Re: [PATCH] mm: Use BUG_ON instead of if condition followed by BUG
Date: Wed, 24 Nov 2021 14:27:51 -0800 [thread overview]
Message-ID: <20211124142751.e48cdcc3aea9e0ef899f4347@linux-foundation.org> (raw)
In-Reply-To: <YZ483gwnwTysPt0G@casper.infradead.org>
On Wed, 24 Nov 2021 13:23:42 +0000 Matthew Wilcox <willy@infradead.org> wrote:
> On Wed, Nov 24, 2021 at 03:08:49AM +0000, cgel.zte@gmail.com wrote:
> > From: chiminghao <chi.minghao@zte.com.cn>
> >
> > Fix the following coccinelle report:
> > ./mm/memory_hotplug.c:2210:2-5:
> > WARNING Use BUG_ON instead of if condition followed by BUG.
>
> What coccinelle script is reporting this?
>
> > - if (try_remove_memory(start, size))
> > - BUG();
> > + BUG_ON(try_remove_memory(start, size));
>
> I really, really, really do not like this. For functions with
> side-effects, this is bad style. If it's a pure predicate, then
> sure, but this is bad.
I don't like it either. Yes, BUG() is special but it's such dangerous
practice. I'd vote to change coccinelle.
next prev parent reply other threads:[~2021-11-24 22:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-24 3:08 cgel.zte
2021-11-24 11:10 ` David Hildenbrand
2021-11-24 13:23 ` Matthew Wilcox
2021-11-24 22:27 ` Andrew Morton [this message]
2021-11-24 22:45 ` John Hubbard
2021-11-25 3:32 ` Matthew Wilcox
2021-11-25 5:29 ` John Hubbard
2021-11-25 0:00 ` Matthew Wilcox
2021-11-27 18:05 ` Julia Lawall
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