lkml.org 
[lkml]   [2017]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] x86/fpu: move FPU state into separate cache
On Wed, Mar 29, 2017 at 2:30 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> The trivial model might be to just declare the fpu part as an unsized
> array at the end:
>
> /* Floating point and extended processor state */
> struct fpu fpu[];
>
> because there is no way in hell that any randomization code can move
> those kinds of unsized arrays around.

Side note: that approach would seem to have the added advantage that
because "fpu" now is an array, it syntactically acts like a pointer in
C, so now syntactically it's going to be equivalent to having a
"struct fpu *" pointer element, but from an allocation and code
generation standpoint it all is like allocating the fpu structure
together with the task struct.

Linus

\
 
 \ /
  Last update: 2017-03-29 23:39    [W:0.055 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site