From mboxrd@z Thu Jan  1 00:00:00 1970
From: riel@surriel.com (Rik van Riel)
Date: Thu, 01 Oct 2015 22:01:24 -0400
Subject: In SMP system, is there any api to disable IRQ for all CPUs?
In-Reply-To: <CANudz+u2euW1WN=jaUhM0n01sVc6P_8t+mzRjSgmDM5cTiYubw@mail.gmail.com>
References: <CANudz+u2euW1WN=jaUhM0n01sVc6P_8t+mzRjSgmDM5cTiYubw@mail.gmail.com>
Message-ID: <560DE574.9090203@surriel.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On 10/01/2015 11:49 AM, loody wrote:
> hi all:
> is there any kernel API can let IRQ disable for all CPU in SMP system
> for a while?
> I just need it for a experiment on my module.
> 
> such as:
> xxxx      --> disable SMP all cpu IRQ
>   OOO   ---> no interrupt happen
>   OOO   ---> no interrupt happen
> zzzz      ---> enable SMP all cou IRQ

Look at the code in kernel/stop_machine.c

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