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Date:   Tue, 4 Apr 2017 13:18:58 +0100
From:   Matt Redfearn <>
To:     "Jason A. Donenfeld" <>
CC:     Ralf Baechle <>, <>,
        Paolo Bonzini <>,
        Marcin Nowakowski <>,
        Masanari Iida <>,
        Chris Metcalf <>,
        LKML <>,
        James Hogan <>,
        Paul Burton <>,
        Ingo Molnar <>,
        Andrew Morton <>
Subject: Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack

Hi Jason,

On 04/04/17 12:58, Jason A. Donenfeld wrote:
> This indeed is useful. Out of curiosity, are other archs using a
> similar technique? In anycase,
> Acked-by: Jason A. Donenfeld <>

Yes, at least x86 and ARM64 do the same thing (probably more)

x86 saves the previous stack pointer on the IRQ stack in
which is then unwound in

ARM64 saves the task SP in
And unwinds it in


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