linux-kernel - smp_call_function() friends and irq/bottom

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Message-ID: <00fb01d3e81b$89b9c2d0$9d2d4870$@lge.com>
Date:   Thu, 10 May 2018 13:58:29 +0900
From:   류호은 <hoeun.ryu@....com>
To:     <mingo@...nel.org>, <peterz@...radead.org>, <aaron.lu@...el.com>,
        <adobriyan@...il.com>, <frederic@...nel.org>,
        <ying.huang@...el.com>
Cc:     <linux-kernel@...r.kernel.org>
Subject: smp_call_function() friends and irq/bottom_half context

Hi, all.

I'm reading kernel/smp.c code and I found comments on smp_call_function()
and smp_call_function_[single/many]
saying that these functions are cannot be called in interrupt disabled
context or irq/bottom half handlers.

I understand that there is a potential deadlock issue when caller CPU of
the functions is waiting for the completion of the callback of other CPUs.
But I was wondering if this is the case even when the caller CPU doesn't
wait for the completion (wait == 0).

Thank you.