linux-kernel - Re: [PATCH] proc: Make inline name size calculation automatic

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Message-ID: <20180615171521.GA4417@avx2>
Date:   Fri, 15 Jun 2018 20:15:21 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: Make inline name size calculation automatic

On Thu, Jun 14, 2018 at 09:30:42PM +0100, David Howells wrote:
> Alexey Dobriyan <adobriyan@...il.com> wrote:
> 
> > > Require a minimum inline name size of 33+1 to allow for names that look
> > > like two hex numbers with a dash between.
> > 
> > Why 34? /proc will fallback to separate allocation for name anyway.
> 
> See above comment.  I ran find on /proc and there were a bunch of files whose
> names were "<hex>-<hex>".  Allow for 16-char hex addresses and add a NUL char
> to that and you get 34.

Those must be /proc/*/map_files symlinks. If that's the case,
they don't have PDEs allocated.