Re: [patch] compress the stack layout of do_page_fault(), x86

[randy_dunlap <rdunlap@xenotime.net>]

On Sat, 9 Jul 2005 17:29:24 +0200 Ingo Molnar wrote:

| 
| Guillaume noticed a bug in the patch, si_signo should be used instead of 
| SIGSEGV. (doh) New patch below.
| 
| 	Ingo
| 
| -----
| 
| this patch pushes the creation of a rare signal frame (SIGBUS or 
| SIGSEGV) into a separate function, thus saving stackspace in the main 
| do_page_fault() stackframe. The effect is 132 bytes less of stack used 
| by the typical do_page_fault() invocation - resulting in a denser 
| cache-layout.
| 
| (another minor effect is that in case of kernel crashes that come from a 
| pagefault, we add less space to the already existing frame, giving the 
| crash functions a slightly higher chance to do their stuff without 
| overflowing the stack.)
| 
| (the changes also result in slightly cleaner code.)
| 
| build and boot tested.

Hi Ingo-

Just to clarify this, "boot tested" does not mean that this
changed code was tested, right?
or do you have a test case that was tested?

Thanks,
---
~Randy