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| author | john stultz <johnstul@us.ibm.com> | 2005-10-30 15:01:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:18 -0800 |
| commit | 1bb34a412750291e4e5e9f1d0fe7ae1b7e976098 (patch) | |
| tree | 00d481a2ff4302f444fbf7c31e5e661f79dc85a9 /include/linux/timex.h | |
| parent | 9c0cbd54ce0397017a823484f9a8054ab369b8a2 (diff) | |
| download | op-kernel-dev-1bb34a412750291e4e5e9f1d0fe7ae1b7e976098.zip op-kernel-dev-1bb34a412750291e4e5e9f1d0fe7ae1b7e976098.tar.gz | |
[PATCH] NTP shift_right cleanup
Create a macro shift_right() that avoids the numerous ugly conditionals in the
NTP code that look like:
if(a < 0)
b = -(-a >> shift);
else
b = a >> shift;
Replacing it with:
b = shift_right(a, shift);
This should have zero effect on the logic, however it should probably have
a bit of testing just to be sure.
Also replace open-coded min/max with the macros.
Signed-off-by : John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/timex.h')
| -rw-r--r-- | include/linux/timex.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h index 7e050a2..04a4a8c 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -282,6 +282,13 @@ static inline int ntp_synced(void) return !(time_status & STA_UNSYNC); } +/* Required to safely shift negative values */ +#define shift_right(x, s) ({ \ + __typeof__(x) __x = (x); \ + __typeof__(s) __s = (s); \ + __x < 0 ? -(-__x >> __s) : __x >> __s; \ +}) + #ifdef CONFIG_TIME_INTERPOLATION |
