linux-kernel - Re: [PATCH v9 01/12] asm-generic: barrier: Add smp_cond_load_relaxed

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Message-ID: <9414714a-ba13-4d17-8b4f-97a03b90d6c1@infradead.org>
Date: Sun, 8 Feb 2026 20:57:50 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
 linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-pm@...r.kernel.org, bpf@...r.kernel.org
Cc: arnd@...db.de, catalin.marinas@....com, will@...nel.org,
 peterz@...radead.org, akpm@...ux-foundation.org, mark.rutland@....com,
 harisokn@...zon.com, cl@...two.org, ast@...nel.org, rafael@...nel.org,
 daniel.lezcano@...aro.org, memxor@...il.com, zhenglifeng1@...wei.com,
 xueshuai@...ux.alibaba.com, joao.m.martins@...cle.com,
 boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH v9 01/12] asm-generic: barrier: Add
 smp_cond_load_relaxed_timeout()




> +/**
> + * smp_cond_load_relaxed_timeout() - (Spin) wait for cond with no ordering
> + * guarantees until a timeout expires.
> + * @ptr: pointer to the variable to wait on.
> + * @cond: boolean expression to wait for.

s/cond/cond_expr/

> + * @time_expr_ns: expression that evaluates to monotonic time (in ns) or,
> + *  on failure, returns a negative value.
> + * @timeout_ns: timeout value in ns
> + * Both of the above are assumed to be compatible with s64; the signed
> + * value is used to handle the failure case in @time_expr_ns.
> + *
> + * Equivalent to using READ_ONCE() on the condition variable.
> + *
> + * Callers that expect to wait for prolonged durations might want to
> + * take into account the availability of ARCH_HAS_CPU_RELAX.
> + */
> +#ifndef smp_cond_load_relaxed_timeout
> +#define smp_cond_load_relaxed_timeout(ptr, cond_expr,			\
> +				      time_expr_ns, timeout_ns)		\
> +({									\


-- 
~Randy