From: David Miller <davem@davemloft.net>
To: drzeus@drzeus.cx
Cc: netdev@vger.kernel.org
Subject: Re: net: alignment problem in icmp code
Date: Sun, 21 Oct 2007 22:15:24 -0700 (PDT) [thread overview]
Message-ID: <20071021.221524.49830652.davem@davemloft.net> (raw)
In-Reply-To: <20071022065443.2f3c1b8a@poseidon.drzeus.cx>
From: Pierre Ossman <drzeus@drzeus.cx>
Date: Mon, 22 Oct 2007 06:54:43 +0200
> On Sun, 21 Oct 2007 16:02:15 -0700 (PDT)
> David Miller <davem@davemloft.net> wrote:
>
> > You will get a 64-bit load and a 64-bit store emitted by
> > the compiler. Here is what we get on sparc64:
>
> I assume those ops cause a bus error on unaligned addresses?
Sure. But the language defines that the types in question
must be 64-bit aligned, so it is legal for the compiler to
emit this code.
It's not a GCC bug.
If you want to let the compiler know that a pointer to a type might
not be aligned, you have to tell it so.
next prev parent reply other threads:[~2007-10-22 5:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-20 21:35 net: alignment problem in icmp code Pierre Ossman
2007-10-21 5:12 ` David Miller
2007-10-21 9:34 ` Pierre Ossman
2007-10-21 19:48 ` David Miller
2007-10-21 21:21 ` Pierre Ossman
2007-10-21 23:02 ` David Miller
2007-10-22 4:54 ` Pierre Ossman
2007-10-22 5:15 ` David Miller [this message]
2007-10-22 7:23 ` Pierre Ossman
2007-10-22 8:31 ` David Miller
2007-10-22 8:42 ` Pierre Ossman
2007-10-22 9:05 ` David Miller
2007-10-22 9:26 ` Pierre Ossman
2007-10-22 9:52 ` Eric Dumazet
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