1/*
 2 * From code in arch/x86/lib/usercopy_64.c, copied to keep tools/ copy
 3 * of the kernel's arch/x86/lib/memcpy_64.s used in 'perf bench mem memcpy'
 4 * happy.
 5 */
 6#include <linux/types.h>
 7
 8unsigned long __memcpy_mcsafe(void *dst, const void *src, size_t cnt);
 9unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len);
10
11unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len)
12{
13	for (; len; --len, to++, from++) {
14		/*
15		 * Call the assembly routine back directly since
16		 * memcpy_mcsafe() may silently fallback to memcpy.
17		 */
18		unsigned long rem = __memcpy_mcsafe(to, from, 1);
19
20		if (rem)
21			break;
22	}
23	return len;
24}