lkml.org 
[lkml]   [2015]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[PATCH 0/1] x86/fpu: math_state_restore() should not blindly disable irqs
On 03/05, Oleg Nesterov wrote:
>
> And this also means I have another off-topic fix for 4.0/stable, will
> send a patch in a minute...

I knew about this problem, but I didn't realize that restore_sigcontext()
can call a sleeping function after math_state_restore(). So I was going
to fix this later, because we need a lot more cleanups in these paths.

But it turns out, it is trivial to trigger the "BUG: sleeping function
called from invalid context" warning, see the test-case I sent to Dave.

To avoid the confusion, this has nothing to do with the problems we
discuss in other threads, or with the recent changes in tip/x86/fpu.

The patch is horrible, yes. But simple, and math_state_restore/init_fpu
are already horrible and need the cleanups. Hopefully I'll send them "soon".

Oleg.



\
 
 \ /
  Last update: 2015-03-05 21:41    [W:0.337 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site