Optimize fpu_copy() a bit by expanding the ->fpstate_active == 1 portion of fpu__save() into it.
( The main purpose of this change is to enable another, larger optimization that will be done in the next patch. ) Reviewed-by: Borislav Petkov <b...@alien8.de> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Dave Hansen <dave.han...@linux.intel.com> Cc: Fenghua Yu <fenghua...@intel.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Oleg Nesterov <o...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/kernel/fpu/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 8835b802aa16..7fdeabc1f2af 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -224,7 +224,10 @@ static void fpu_copy(struct fpu *dst_fpu, struct fpu *src_fpu) memset(&dst_fpu->state.xsave, 0, xstate_size); copy_fpregs_to_fpstate(dst_fpu); } else { - fpu__save(src_fpu); + preempt_disable(); + if (!copy_fpregs_to_fpstate(src_fpu)) + fpregs_deactivate(src_fpu); + preempt_enable(); memcpy(&dst_fpu->state, &src_fpu->state, xstate_size); } } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/