From: Andrew Morton <akpm@linux-foundation.org>
To: Akinobu Mita <akinobu.mita@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Christoph Lameter <cl@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>,
Joern Engel <joern@logfs.org>,
logfs@logfs.org, Marcin Slusarz <marcin.slusarz@gmail.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
linux-arch@vger.kernel.org
Subject: Re: [PATCH 3/4] string: introduce memchr_inv
Date: Mon, 22 Aug 2011 14:50:50 -0700 [thread overview]
Message-ID: <20110822145050.e3471fa0.akpm@linux-foundation.org> (raw)
In-Reply-To: <20110822135218.f2d9f462.akpm@linux-foundation.org>
On Mon, 22 Aug 2011 13:52:18 -0700
Andrew Morton <akpm@linux-foundation.org> wrote:
> > + value64 = value | value << 8 | value << 16 | value << 24;
> > + value64 = (value64 & 0xffffffff) | value64 << 32;
> > + prefix = 8 - ((unsigned long)start) % 8;
> > +
> > + if (prefix) {
> > + u8 *r = check_bytes8(start, value, prefix);
> > + if (r)
> > + return r;
> > + start += prefix;
> > + bytes -= prefix;
> > + }
> > +
> > + words = bytes / 8;
> > +
> > + while (words) {
> > + if (*(u64 *)start != value64)
>
> OK, problem. This will explode if passed a misaligned address on
> certain (non-x86) architectures.
pls ignore. As Marcin points out, I can't read.
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next prev parent reply other threads:[~2011-08-22 21:50 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-22 16:29 [PATCH 0/4] debug-pagealloc improvements Akinobu Mita
2011-08-22 16:29 ` [PATCH 1/4] debug-pagealloc: use plain __ratelimit() instead of printk_ratelimit() Akinobu Mita
2011-08-22 16:29 ` [PATCH 2/4] debug-pagealloc: add support for highmem pages Akinobu Mita
2011-08-22 20:43 ` Andrew Morton
2011-08-23 15:26 ` Akinobu Mita
2011-08-22 16:29 ` [PATCH 3/4] string: introduce memchr_inv Akinobu Mita
2011-08-22 16:57 ` Pekka Enberg
2011-08-22 17:09 ` Jörn Engel
2011-08-22 20:52 ` Andrew Morton
2011-08-22 21:50 ` Andrew Morton [this message]
2011-08-22 21:56 ` Eric Dumazet
2011-08-22 20:59 ` Geert Uytterhoeven
2011-08-23 14:31 ` Christoph Lameter
2011-08-22 16:29 ` [PATCH 4/4] debug-pagealloc: use memchr_inv Akinobu Mita
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