linux-kernel - Re: [PATCH v3 1/9] smp: Run functions concurrently in smp_call_function

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Message-ID: <20190722182159.GB6698@worktop.programming.kicks-ass.net>
Date:   Mon, 22 Jul 2019 20:21:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v3 1/9] smp: Run functions concurrently in
 smp_call_function_many()

On Thu, Jul 18, 2019 at 05:58:29PM -0700, Nadav Amit wrote:
> +/*
> + * Call a function on all processors.  May be used during early boot while
> + * early_boot_irqs_disabled is set.
> + */
> +static inline void on_each_cpu(smp_call_func_t func, void *info, int wait)
> +{
> +	on_each_cpu_mask(cpu_online_mask, func, info, wait);
> +}

I'm thinking that one if buggy, nothing protects online mask here.