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replace bit shifting loop with 1<<fls(n), improve comments.

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Reviewed by: davide
This commit is contained in:
Alfred Perlstein 2012-12-04 05:28:20 +00:00
parent 0a44395e2d
commit 922314f018
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=243853
1 changed files with 4 additions and 6 deletions
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10
sys/kern/kern_timeout.c
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@ -84,7 +84,7 @@ SYSCTL_INT(_debug, OID_AUTO, to_avg_mpcalls, CTLFLAG_RD, &avg_mpcalls, 0,
* TODO:
* allocate more timeout table slots when table overflows.
*/
int callwheelsize, callwheelbits, callwheelmask;
int callwheelsize, callwheelmask;
/*
* The callout cpu migration entity represents informations necessary for
@ -218,12 +218,10 @@ kern_timeout_callwheel_alloc(caddr_t v)
timeout_cpu = PCPU_GET(cpuid);
cc = CC_CPU(timeout_cpu);
/*
* Calculate callout wheel size
* Calculate callout wheel size, should be next power of two higher
* than 'ncallout'.
*/
for (callwheelsize = 1, callwheelbits = 0;
callwheelsize < ncallout;
callwheelsize <<= 1, ++callwheelbits)
;
callwheelsize = 1 << fls(ncallout);
callwheelmask = callwheelsize - 1;
cc->cc_callout = (struct callout *)v;