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Date:   Wed, 4 Jan 2023 13:09:16 +0100
From:   Heiko Carstens <hca@linux.ibm.com>
To:     Peter Zijlstra <peterz@infradead.org>
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Subject: Re: [RFC][PATCH 07/12] percpu: Wire up cmpxchg128
Message-ID: <Y7VsbM4ada2KkAdx@osiris>
References: <20221219153525.632521981@infradead.org>
 <20221219154119.286760562@infradead.org>
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On Mon, Dec 19, 2022 at 04:35:32PM +0100, Peter Zijlstra wrote:
> In order to replace cmpxchg_double() with the newly minted
> cmpxchg128() family of functions, wire it up in this_cpu_cmpxchg().
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
...
> --- a/arch/s390/include/asm/percpu.h
> +++ b/arch/s390/include/asm/percpu.h
> +#define this_cpu_cmpxchg_16(pcp, oval, nval)				\
> +({									\
> +	u128 old__ = __pcpu_cast_128((nval), (nval));			\
> +	u128 new__ = __pcpu_cast_128((oval), (oval));			\

spot the bug... please merge the below into this patch.

diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
index 24a4d9d644c0..d1997d01892a 100644
--- a/arch/s390/include/asm/percpu.h
+++ b/arch/s390/include/asm/percpu.h
@@ -156,8 +156,8 @@
 
 #define this_cpu_cmpxchg_16(pcp, oval, nval)				\
 ({									\
-	u128 old__ = __pcpu_cast_128((nval), (nval));			\
-	u128 new__ = __pcpu_cast_128((oval), (oval));			\
+	u128 old__ = __pcpu_cast_128((oval), (oval));			\
+	u128 new__ = __pcpu_cast_128((nval), (nval));			\
 	typedef typeof(pcp) pcp_op_T__;					\
 	pcp_op_T__ *ptr__;						\
 	u128 ret__;							\