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Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack

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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 <Jason@zx2c4.com>

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

x86 saves the previous stack pointer on the IRQ stack in 
http://lxr.free-electrons.com/source/arch/x86/kernel/irq_32.c#L70
which is then unwound in 
http://lxr.free-electrons.com/source/arch/x86/kernel/dumpstack.c#L51

ARM64 saves the task SP in 
http://lxr.free-electrons.com/source/arch/arm64/kernel/entry.S#L249
And unwinds it in 
http://lxr.free-electrons.com/source/arch/arm64/kernel/traps.c#L140

Thanks,
Matt

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Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack "Jason A. Donenfeld" <Jason@zx2c4.com> - 2017-04-04 14:00 +0200
  Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack Matt Redfearn <matt.redfearn@imgtec.com> - 2017-04-04 14:20 +0200
  Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack Ralf Baechle <ralf@linux-mips.org> - 2017-04-04 14:50 +0200

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