linux-kernel - Re: linux-next: manual merge of the akpm tree with Linus' tree

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Date:	Wed, 11 Sep 2013 00:53:49 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Chinner <dchinner@...hat.com>,
	Glauber Costa <glommer@...nvz.org>
Subject: Re: linux-next: manual merge of the akpm tree with Linus' tree

On Tue, Sep 10, 2013 at 04:37:19PM -0700, Linus Torvalds wrote:
> On Tue, Sep 10, 2013 at 3:59 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > It's not that bad, actually; I think the variant I've pushed right now
> > (vfs.git#for-next, head at f5e1dd34561e0fb06400b378d595198918833021) should
> > be doing the right thing.  It ought to cover everything in your branch
> > in -next from "fs: bump inode and dentry counters to long" on to the
> > end of queue.
> 
> >From a quick look, this looks pretty broken:
> 
>     if (list_lru_add(&dentry->d_sb->s_dentry_lru, &dentry->d_lru))
>         this_cpu_inc(nr_dentry_unused);
>     dentry->d_flags |= DCACHE_LRU_LIST;
> 
> because if that list_lru_add() can fail, then we shouldn't set the
> DCACHE_LRU_LIST bit either.

list_lru_add() can fail if it's already on the list; leaving the counter
alone should've been conditional on that, setting the flag - no.  Said
that, it probably should be WARN_ON(!...); this_cpu_inc(); ... |= ...;
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