mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 21:57:43 +00:00
Code Issues Releases Wiki Activity

xtensa: don't clear cpenable unconditionally on release

Browse source 
Clearing cpenable special register for a task without changing
coprocessor owner for the coprocessors that were enabled will result in
coprocessor context flush and immediate reload at the next attempt to
access this coprocessor if it happens before the context switch.
Avoid it by only clearing cpenable special register if
coprocessor_release_all is called for the current task.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2018-11-26 16:30:51 -08:00
parent 5dacbbef3d
commit be38e4f2cc
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/xtensa/kernel/process.c
View file

@ -87,7 +87,8 @@ void coprocessor_release_all(struct thread_info *ti)
}
ti->cpenable = cpenable;
xtensa_set_sr(0, cpenable);
if (ti == current_thread_info())
xtensa_set_sr(0, cpenable);
preempt_enable();
}