linux-kernel - Re: [RFC][PATCH 07/12] percpu: Wire up cmpxchg128

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Message-ID: <Y7VsbM4ada2KkAdx@osiris>
Date:   Wed, 4 Jan 2023 13:09:16 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     torvalds@...ux-foundation.org, corbet@....net, will@...nel.org,
        boqun.feng@...il.com, mark.rutland@....com,
        catalin.marinas@....com, dennis@...nel.org, tj@...nel.org,
        cl@...ux.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
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        robin.murphy@....com, dwmw2@...radead.org,
        baolu.lu@...ux.intel.com, Arnd Bergmann <arnd@...db.de>,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
        roman.gushchin@...ux.dev, 42.hyeyoo@...il.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
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        linux-arch@...r.kernel.org
Subject: Re: [RFC][PATCH 07/12] percpu: Wire up cmpxchg128

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@...radead.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__;							\