linux-kernel - Re: [PATCH v3] pipe: limit the per-user amount of pages allocated in pipes

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Date:	Tue, 19 Jan 2016 00:12:44 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	w@....eu, lkp@...el.com
Cc:	kbuild-all@...org, viro@...iv.linux.org.uk,
	torvalds@...ux-foundation.org, socketpair@...il.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] pipe: limit the per-user amount of pages allocated in pipes

Willy Tarreau wrote:
> On Mon, Jan 18, 2016 at 08:22:10PM +0800, kbuild test robot wrote:
> > Hi Willy,
> > 
> > [auto build test WARNING on linus/master]
> > [also build test WARNING on next-20160118]
> > [cannot apply to tip/sched/core v4.4]
> > [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
> 
> Well, I don't understand how to read the output here, I'm sorry. Since this
> patch modifies the user_struct, it has a dependency on the following patch
> just merged into Linus tree :
> 
>    712f4aa ("unix: properly account for FDs passed over unix sockets")
> 
> That's probably why you have the "cannot apply" error above.

The output says that description for newly added field is missing.
I think adding some description like

  *      @fasync_readers: reader side fasync
  *      @fasync_writers: writer side fasync
  *      @bufs: the circular array of pipe buffers
+ *      @user: the user who created this pipe
  **/
 struct pipe_inode_info {
         struct mutex mutex;

will fix.