diff options
Diffstat (limited to 'lib/div64.c')
| -rw-r--r-- | lib/div64.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/lib/div64.c b/lib/div64.c index 206f582ca9..62933c92c4 100644 --- a/lib/div64.c +++ b/lib/div64.c @@ -25,19 +25,25 @@ #if BITS_PER_LONG == 32 #ifndef __div64_32 -uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base) +/* + * Don't instrument this function as it may be called from tracing code, since + * it needs to read the timer and this often requires calling do_div(), which + * calls this function. + */ +uint32_t __attribute__((weak, no_instrument_function)) __div64_32(u64 *n, + u32 base) { - uint64_t rem = *n; - uint64_t b = base; - uint64_t res, d = 1; - uint32_t high = rem >> 32; + u64 rem = *n; + u64 b = base; + u64 res, d = 1; + u32 high = rem >> 32; /* Reduce the thing a bit first */ res = 0; if (high >= base) { high /= base; - res = (uint64_t) high << 32; - rem -= (uint64_t) (high*base) << 32; + res = (u64)high << 32; + rem -= (u64)(high * base) << 32; } while ((int64_t)b > 0 && b < rem) { |