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@xxxxxxxxx>
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
