linux-kernel - Re: [PATCH v2 2/2] locking/atomic/x86: Introduce arch_try

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Message-ID: <20220513221820.GK76023@worktop.programming.kicks-ass.net>
Date:   Sat, 14 May 2022 00:18:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Uros Bizjak <ubizjak@...il.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Marco Elver <elver@...gle.com>
Subject: Re: [PATCH v2 2/2] locking/atomic/x86: Introduce arch_try_cmpxchg64

On Fri, May 13, 2022 at 05:30:09PM +0200, Uros Bizjak wrote:


> +#define arch_try_cmpxchg64(ptr, po, n)					\
> +	((__typeof__(*(ptr)))__try_cmpxchg64((ptr), (unsigned long long *)(po), \
> +					     (unsigned long long)(n)))

That doesn't look right (unless it's so late I really can't read
anymore, in which case ignore me and I'll try again on monday). But the
return value of try_cmpxchg is bool, not typeof(*ptr).