From: Luca Barbieri <ldb@ldb.ods.org>
To: Roman Zippel <zippel@linux-m68k.org>
Cc: Linux-Kernel ML <linux-kernel@vger.kernel.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it
Date: 09 Aug 2002 00:40:17 +0200 [thread overview]
Message-ID: <1028846417.1669.95.camel@ldb> (raw)
In-Reply-To: <Pine.LNX.4.44.0208090018470.8911-100000@serv>
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On Fri, 2002-08-09 at 00:27, Roman Zippel wrote:
> Hi,
>
> On 9 Aug 2002, Luca Barbieri wrote:
>
> > - Didn't implement atomic_{add,sub,inc,dec}_return. This is currently
> > not used in the generic kernel but it can be useful.
>
> m68k has a cmpxchg like instruction, which can be used for that.
>
> > - Had inline assembly for things the compiler should be able to generate
> > on its own
>
> The compiler can cache the value in a register
It shouldn't since it is volatile and the machine has instructions with
memory operands.
Anyway, let's ignore the m68k-specific parts of the patch.
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next prev parent reply other threads:[~2002-08-08 22:36 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 [this message]
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
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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