Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions

[Peter Zijlstra]

On Tue, May 07, 2019 at 08:31:14AM -0700, Linus Torvalds wrote:
> The reality is that changing something fundamental like the kernel
> stack at this point for an architecture that will not change in the
> future is silly.

In my eyes it makes sense because i386 is a minority architecture at
this point, and 'nobody' wants to care about how its different if they
don't have to.

> The reality is that Peter's patch is much bigger than mine, because it
> needed a lot of other changes *because* it did that change.

Yes, I change the way stack layout works on i386, and yes that affects a
lot of code. _However_ all of that code is now more like x86_64 than it
was.

Earlier you said that kernel_stack_pointer() was a horrible thing; and
most/all the code that I ended up touching was similarly horrible.

Would you consider my approach later on, under the guise of unification?
We can work on it for a while, and make sure all the iffy bits are
sorted, no need to rush?