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

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Message-ID: <CA+55aFwXXsk47WrAqF6yuVXOQHuNpxT7x-=MmLsNBptyzjH1zQ@mail.gmail.com>
Date:	Tue, 10 Sep 2013 16:37:19 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
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 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.

That said, I don't see how it can fail. We only do this with the
dentry locked, and when it's not already on the LRU list. So I think
the "if()" is just misleading and unnecessary - but the code works.

              Linus
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