linux-kernel - Re: [PATCH 0/5] x86-32: improve atomic64

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Date:	Mon, 1 Mar 2010 18:16:25 +0100
From:	Luca Barbieri <luca@...a-barbieri.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] x86-32: improve atomic64_t functions (v2)

> Yes, and with the test turned on, the kernel crashes immediately on boot
> on x86-64.
>
> Some minor investigation reveals the following:
>
> lib/atomic64.c has the wrong return value for atomic64_add_unless().
> With "wrong" I mean it is the opposite sense compared to
> atomic_add_unless(), not just on x86 but on all architectures.
>
> Accordingly, I have to conclude that lib/atomic64.c is buggy, and that
> since your test matches that bug, I will have to conclude that your
> x86-32 implementation is also buggy.  Thus, please send patches to fix
> your test and your 32-bit implementations (and preferrably
> lib/atomic64.c too, but I can do that just fine.)

You are right: sent a patchset to fix it.
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