[lkml]   [2007]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/5] x86: another attempt at x86 pagetable unification

* Jeremy Fitzhardinge <> wrote:

> > found a couple of bugs.
> >
> > firstly, 64-bit wasnt so lucky, you broke
> > iounmap()/change_page_attr()
> > :-)
> Crap. Worked for me. I'll look into it.

well, there's an easy solution for unification patches: the resulting
object files must have _exactly the same_ content as without the
unification patches. (Modulo strings as WARN_ON()s referring to
include-file names.)

If they differ then the unification did something wrong. With your
patchset and the config i sent, the difference is visible in the image
size already:

text data bss dec hex filename
7763766 967330 5812328 14543424 ddea40 vmlinux.after
7763811 967330 5812328 14543469 ddea6d vmlinux.before

also, reducing the size and scope of changes helps as well - because
that way it can be bisected down to specific changes. Mistakes
inevitably happen, especially if you do not enforce a rigid
byte-for-byte correctness along the way. You did 5 rather large patches,
and it's not testable because your unification steps were too coarse.

In other words: you were asking for trouble and you got it :-)


 \ /
  Last update: 2007-12-20 22:41    [W:0.054 / U:0.244 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site