linux-kernel - Re: [PATCH] futex: cmpxchg_futex_value

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Message-ID: <20110309221718.GA28592@google.com>
Date:	Wed, 9 Mar 2011 14:17:18 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Darren Hart <darren@...art.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Matt Turner <mattst88@...il.com>,
	Russell King <linux@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Michal Simek <monstr@...str.eu>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] futex: cmpxchg_futex_value_locked API change

On Wed, Mar 09, 2011 at 04:08:39PM +0100, Martin Schwidefsky wrote:
> On Wed, 9 Mar 2011 03:25:50 -0800
> Michel Lespinasse <walken@...gle.com> wrote:
> > All right. Attaching updated version of the diff. I also fixed the s390
> > issue reported by Martin Schwidefsky.
> 
> The inline assmeblies look good now but I get this compile error on s390:
> 
>   CC      arch/s390/lib/uaccess_pt.o
> arch/s390/lib/uaccess_pt.c:373: error: conflicting types for 'futex_atomic_cmpxchg_pt'
> arch/s390/lib/uaccess.h:21: note: previous declaration of 'futex_atomic_cmpxchg_pt' was here
> arch/s390/lib/uaccess_pt.c:403: warning: initialization from incompatible pointer type
> make[1]: *** [arch/s390/lib/uaccess_pt.o] Error 1

My bad. Somehow I made the change in arch/s390/lib/uaccess_std.c but missed
it in arch/s390/lib/uaccess_pt.c ... Attached patch below goes on top of
the previous changes - Thomas, if you have picked the previous patch,
please squash this one on top of it :)

Signed-off-by: Michel Lespinasse <walken@...gle.com>

diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
index afc716a..7483383 100644
--- a/arch/s390/lib/uaccess_pt.c
+++ b/arch/s390/lib/uaccess_pt.c
@@ -370,8 +370,8 @@ static int __futex_atomic_cmpxchg_pt(u32 *uval, u32 __user *uaddr,
 	return ret;
 }
 
-int futex_atomic_cmpxchg_pt(int *uval, int __user *uaddr,
-			    int oldval, int newval)
+int futex_atomic_cmpxchg_pt(u32 *uval, u32 __user *uaddr,
+			    u32 oldval, u32 newval)
 {
 	int ret;
 

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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