| Date | Mon, 09 Mar 2015 13:36:09 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH] x86/fpu: drop_fpu() should not assume that tsk == current |
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On 03/09/2015 01:10 PM, Oleg Nesterov wrote: > drop_fpu() does clear_used_math() and usually this is correct because > tsk == current. However switch_fpu_finish()->restore_fpu_checking() is > called before it updates the "current_task" variable. If it fails, we > will wrongly clear the PF_USED_MATH flag of the previous task.
Ouch. Good catch.
> Signed-off-by: Oleg Nesterov <oleg@redhat.com> > Cc: <stable@vger.kernel.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
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