Re: [PATCH 07/19] x86/dumpstack: add IRQ_USABLE_STACK_SIZE define
From: Andy Lutomirski
Date: Thu Jul 21 2016 - 18:01:38 EST
On Thu, Jul 21, 2016 at 2:21 PM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> For reasons unknown, the x86_64 irq stack starts at an offset 64 bytes
> from the end of the page. At least make that explicit.
This is a change in behavior -- see below. Please mention this in the
> FIXME: Can we just remove the 64 byte gap? If not, at least document
I have no clue.
> irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
> - irq_stack = (unsigned long *)(per_cpu(irq_stack_ptr, cpu) - IRQ_STACK_SIZE);
> + irq_stack = (unsigned long *)(per_cpu(irq_stack_ptr, cpu) -
> + IRQ_USABLE_STACK_SIZE);
This is different.