replace bit shifting loop with 1<<fls(n), improve comments.
Reviewed by: davide
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parent
0a44395e2d
commit
922314f018
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=243853
@ -84,7 +84,7 @@ SYSCTL_INT(_debug, OID_AUTO, to_avg_mpcalls, CTLFLAG_RD, &avg_mpcalls, 0,
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* TODO:
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* allocate more timeout table slots when table overflows.
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*/
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int callwheelsize, callwheelbits, callwheelmask;
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int callwheelsize, callwheelmask;
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/*
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* The callout cpu migration entity represents informations necessary for
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@ -218,12 +218,10 @@ kern_timeout_callwheel_alloc(caddr_t v)
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timeout_cpu = PCPU_GET(cpuid);
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cc = CC_CPU(timeout_cpu);
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/*
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* Calculate callout wheel size
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* Calculate callout wheel size, should be next power of two higher
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* than 'ncallout'.
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*/
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for (callwheelsize = 1, callwheelbits = 0;
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callwheelsize < ncallout;
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callwheelsize <<= 1, ++callwheelbits)
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;
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callwheelsize = 1 << fls(ncallout);
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callwheelmask = callwheelsize - 1;
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cc->cc_callout = (struct callout *)v;
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