linux-kernel - Re: [PATCH] proc: return on proc

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Message-ID: <CACQ1gAjky4wUXhzmn-ppTF6Cw6CSCoeLHjghfOFPhOHKHKOywg@mail.gmail.com>
Date:	Tue, 20 Aug 2013 08:25:19 +0200
From:	Richard Genoud <richard.genoud@...il.com>
To:	Marc Dionne <marc.c.dionne@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] proc: return on proc_readdir error

2013/8/20 Marc Dionne <marc.c.dionne@...il.com>:
> On Mon, Aug 19, 2013 at 7:49 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> On Mon, Aug 19, 2013 at 1:33 PM, Marc Dionne <marc.c.dionne@...il.com> wrote:
>>>
>>> By my reading that commit (f0c3b5093add) also made proc_readdir always
>>> return 0, so with this patch the effect I see is that no pid entries
>>> are listed under /proc, breaking ps for instance.  I don't see how
>>> even the previous version of proc_readdir could return a negative
>>> value; looks like 1 and 0 were the only possible return values.
>>
>> Yes, see the other thread. The "return 1" case had gotten lost. I
>> think current git should get everything right, but please do test. I
>> did some testing of my own with a random little getdents test-program
>> (just checking that it got the same results with different (small)
>> buffer sizes), but it was by no means exhaustive.
>>
>>               Linus
>
> It does fix the symptoms I was seeing, thanks.  "ps" now has output
> and the pid entries are now visible again under /proc.
>
> Marc
arg !
I was so focused on getting the non-PID proc entries right that I
didn't even see all the missing PIDs when I tested it !

/me need holidays.
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