[lkml]   [2014]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: frequent lockups in 3.18rc4
On Fri, Nov 21, 2014 at 9:19 AM, Linus Torvalds
<> wrote:
> On Fri, Nov 21, 2014 at 9:08 AM, Steven Rostedt <> wrote:
>> Actually, in_nmi() is now safe for vmalloc faults. In fact, it handles the
>> clobbering of the cr2 register just fine.
> That's not what I object to and find incorrect wrt NMI.
> Compare the simple and correct 32-bit code to the complex and
> incorrect 64-bit code.
> In particular, look at how the 32-bit code relies *entirely* on hardware state.
> Then look at where the 64-bit code does not.

Both mystify me. Why does the 32-bit version walk down the hierarchy
at all instead of just touching the top level?

And why does the 64-bit version assert that the leaves of the tables
match? It's already asserted that it's walking down pgd pointers that
are *exactly the same pointers*, so of course the stuff they point to
is the same.


 \ /
  Last update: 2014-11-21 19:01    [W:0.286 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site