linux-kernel - Re: [PATCH v5 1/8] smp: Run functions concurrently in smp_call_function_many

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Message-ID: <20210218111228.GG4348@worktop.programming.kicks-ass.net>
Date:   Thu, 18 Feb 2021 12:12:28 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Rik van Riel <riel@...riel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v5 1/8] smp: Run functions concurrently in
 smp_call_function_many_cond()

On Thu, Feb 18, 2021 at 09:36:09AM +0000, Nadav Amit wrote:
> I prefer to export on_each_cpu_cond_mask() and instead turn the users
> (on_each_cpu(), on_each_cpu_mask() and on_each_cpu_cond()) into inline
> functions in smp.h.

That makes it impossible (barring LTO) for the compiler to do constant
propagation on the cond and mask thingies.