Messages in this thread Patch in this message |  | | From | riel@redhat ... | Subject | [PATCH 1/8] x86, fpu: unlazy_fpu: don't reset thread.fpu_counter | Date | Fri, 6 Feb 2015 15:01:58 -0500 |
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From: Oleg Nesterov <oleg@redhat.com>
It is not clear why the "else" branch clears ->fpu_counter, this makes no sense.
If use_eager_fpu() then this has no effect. Otherwise, if we actually wanted to prevent fpu preload after the context switch we would need to reset it unconditionally, even if __thread_has_fpu().
Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Rik van Riel <riel@redhat.com> --- arch/x86/kernel/i387.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 47348653503a..c3b92c0975cd 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -122,8 +122,7 @@ void unlazy_fpu(struct task_struct *tsk) if (__thread_has_fpu(tsk)) { __save_init_fpu(tsk); __thread_fpu_end(tsk); - } else - tsk->thread.fpu_counter = 0; + } preempt_enable(); } EXPORT_SYMBOL(unlazy_fpu); -- 1.9.3
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