LXR linux/tools/perf/bench/mem-memcpy-x86-64-lib.c

   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}
  25