Re: [PATCH v3 45/51] x86: remove 64-byte gap at end of irq stack

[Andy Lutomirski]

On Fri, Aug 12, 2016 at 7:29 AM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> There has been a 64-byte gap at the end of the irq stack for at least 12
> years.  It predates git history, and I can't find any good reason for
> it.  Remove it.  What's the worst that could happen?

I can't think of any reason this would matter.

For that matter, do you have any idea why irq_stack_union is a union
or why we insist on sticking it at %gs:0?  Sure, the *canary* needs to
live at a fixed offset (because GCC is daft, sigh), but I don't see
what that has to do with the rest of the IRQ stack.

--Andy