From: David Woodhouse <dwmw2@infradead.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Luca Barbieri <ldb@ldb.ods.org>,
Roman Zippel <zippel@linux-m68k.org>,
Linux-Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it
Date: Mon, 12 Aug 2002 12:16:48 +0100 [thread overview]
Message-ID: <20995.1029151008@redhat.com> (raw)
In-Reply-To: <1028850350.28882.121.camel@irongate.swansea.linux.org.uk>
alan@lxorguk.ukuu.org.uk said:
> Possibly not - volatile doesnt guarantee the compiler won't do
> x = 1
> add *p into x
> store x into *p
Er, AIUI 'volatile' guarantees that '*p++' will do precisely that. It's a
load, an add and a store, and the rules about volatile mean that the load
and the store _must_ be separate.
--
dwmw2
next prev parent reply other threads:[~2002-08-12 11:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 21:43 [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it Luca Barbieri
2002-08-08 21:58 ` Roman Zippel
2002-08-08 22:11 ` Luca Barbieri
2002-08-08 22:27 ` Roman Zippel
2002-08-08 22:40 ` Luca Barbieri
2002-08-08 23:04 ` Roman Zippel
2002-08-09 0:11 ` Alan Cox
2002-08-08 23:09 ` Luca Barbieri
2002-08-09 3:52 ` H. Peter Anvin
2002-08-08 23:45 ` Alan Cox
2002-08-12 11:16 ` David Woodhouse [this message]
2002-08-12 12:03 ` Luca Barbieri
2002-08-08 23:29 ` Russell King
2002-08-09 0:41 ` [PATCH] [2.5] (v2) " Luca Barbieri
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