| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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 | |
| 8 | unsigned long __memcpy_mcsafe(void *dst, const void *src, size_t cnt); |
| 9 | unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len); |
| 10 | |
| 11 | unsigned 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 | } |