Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 21 Jan 2020 13:04:44 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Davidlohr Bueso <dave@stgolabs.net>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Davidlohr Bueso <dbueso@suse.de>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        linux-m68k <linux-m68k@vger.kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH] lib/rbtree: avoid pointless rb_node alignment
Message-Id: <20200121130444.0f5c39dc1ca6ba393084b14b@linux-foundation.org>
In-Reply-To: <20200120175144.67625skg6eiprpsa@linux-p48b>
References: <20200110215429.30360-1-dave@stgolabs.net>
        <CAMuHMdXeZvJ0X6Ah2CpLRoQJm+YhxAWBt-rUpxoyfOLTcHp+0g@mail.gmail.com>
        <20200120175144.67625skg6eiprpsa@linux-p48b>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, 20 Jan 2020 09:51:44 -0800 Davidlohr Bueso <dave@stgolabs.net> wrote:

> On Mon, 20 Jan 2020, Geert Uytterhoeven wrote:
> 
> >timerqueue_del() uses rbtree, and
> >
> >    #define rb_parent(r)   ((struct rb_node *)((r)->__rb_parent_color & ~3))
> >
> >relies on all objects being 4-byte aligned.  But your patch broke that
> >assumption on m68k, where the default alignment is 2-byte.
> >
> >Andrew: please drop this patch.
> 
> Yeah that's too bad. I'll send a patch improving the comment around the alignment
> once the patch is dropped.

Thanks, I'll drop this patch.