Release 4.9 include/asm-generic/simd.h

#include <linux/hardirq.h>

/*
 * may_use_simd - whether it is allowable at this time to issue SIMD
 *                instructions or access the SIMD register file
 *
 * As architectures typically don't preserve the SIMD register file when
 * taking an interrupt, !in_interrupt() should be a reasonable default.
 */


static __must_check inline bool may_use_simd(void)
{
	return !in_interrupt();
}
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Directory: include/asm-generic