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From: Randy Dunlap <rdunlap@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	David Howells <dhowells@redhat.com>
Cc: Hulk Robot <hulkci@huawei.com>,
	Zheng Zengkai <zhengzengkai@huawei.com>,
	Tom Rix <trix@redhat.com>,
	linux-afs@lists.infradead.org,
	Marc Dionne <marc.dionne@auristor.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] afs: fix no return statement in function returning non-void
Date: Tue, 15 Jun 2021 16:58:01 -0700	[thread overview]
Message-ID: <f2764b10-dd0d-cabf-0264-131ea5829fed@infradead.org> (raw)
In-Reply-To: <CAHk-=whARK9gtk0BPo8Y0EQqASNG9SfpF1MRqjxf43OO9F0vag@mail.gmail.com>

On 6/15/21 7:49 AM, Linus Torvalds wrote:
> On Tue, Jun 15, 2021 at 4:55 AM David Howells <dhowells@redhat.com> wrote:
>>
>> From: Zheng Zengkai <zhengzengkai@huawei.com>
>>
>> Add missing return to fix following compilation issue:
>>
>> fs/afs/dir.c: In function ‘afs_dir_set_page_dirty’:
>> fs/afs/dir.c:51:1: error: no return statement in function
>> returning non-void [-Werror=return-type]
> 
> This warning is actively wrong, and the patch is the wrong thing to do.
> 
> What compiler / architecture / config?
> 
> Because BUG() should have an "unreachable()", and the compiler should
> know that a return statement isn't needed (and adding it shouldn't
> make any difference).
> 
> And it's not warning for me when I build that code. So I really think
> the real bug is entirely somewhere else, and this patch is papering
> over the real problem.

Hi,

Some implementations of BUG() are macros, not functions, so "unreachable"
is not applicable AFAIK.


-- 
~Randy


  reply	other threads:[~2021-06-15 23:58 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15 11:55 David Howells
2021-06-15 12:03 ` David Howells
2021-06-15 14:49 ` Linus Torvalds
2021-06-15 23:58   ` Randy Dunlap [this message]
2021-06-16  0:32     ` Linus Torvalds
2021-06-16  1:38       ` Randy Dunlap
2021-06-16  2:19         ` Randy Dunlap
2021-06-16  3:15         ` Zheng Zengkai
2021-06-16 12:56           ` Tom Rix
2021-06-16 14:34             ` Linus Torvalds
2021-06-16 16:22               ` Tom Rix
2021-06-16 16:29                 ` Linus Torvalds
2021-06-18 15:23                   ` Arnd Bergmann
2021-06-16 13:41           ` David Howells
  -- strict thread matches above, loose matches on Subject: below --
2021-03-27 12:16 Zheng Zengkai
2021-03-31  2:32 ` Zheng Zengkai
2021-04-08 14:06 ` David Howells
2021-04-19 22:31   ` Randy Dunlap
2021-05-27 19:48     ` Randy Dunlap

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