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time: ntp: micro-optimize ntp_update_offset()

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Impact: cleanup, no functionality changed

The time_reftime update in ntp_update_offset() to xtime.tv_sec
is a convoluted way of saying that we want to freeze the frequency
and want the 'secs' delta to be 0. Also make this branch unlikely.

This shaves off 8 bytes from the code size:

   text	   data	    bss	    dec	    hex	filename
   2504	    114	    136	   2754	    ac2	ntp.o.before
   2496	    114	    136	   2746	    aba	ntp.o.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-02-22 13:29:09 +01:00
parent 478b7aab16
commit c7986acba2
1 changed files with 3 additions and 3 deletions
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6
kernel/time/ntp.c
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@ -141,10 +141,10 @@ static void ntp_update_offset(long offset)
* Select how the frequency is to be controlled
* and in which mode (PLL or FLL).
*/
if (time_status & STA_FREQHOLD || time_reftime == 0)
time_reftime = xtime.tv_sec;
secs = xtime.tv_sec - time_reftime;
if (unlikely(time_status & STA_FREQHOLD || time_reftime == 0))
secs = 0;
time_reftime = xtime.tv_sec;
offset64 = offset;