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time: Rename misnamed minsec argument of clocks_calc_mult_shift()

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The minsec argument to clocks_calc_mult_shift() is misnamed. It is used 
to clamp the magnitude of the mult factor so that a multiplication with 
any value in the given range won't overflow a 64 bit result.  Let's 
rename it to match the actual usage.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: John Stultz <johnstul@us.ibm.com>
LKML-Reference: <alpine.LFD.2.00.1101111207140.17086@xanadu.home>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Nicolas Pitre 2011-01-11 12:18:12 -05:00 • committed by Thomas Gleixner
parent cb600d2f83
commit 5fdade95f2
1 changed files with 4 additions and 4 deletions
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8
kernel/time/clocksource.c
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@ -113,7 +113,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
* @shift: pointer to shift variable * @shift: pointer to shift variable
* @from: frequency to convert from * @from: frequency to convert from
* @to: frequency to convert to * @to: frequency to convert to
* @minsec: guaranteed runtime conversion range in seconds * @maxsec: guaranteed runtime conversion range in seconds
* *
* The function evaluates the shift/mult pair for the scaled math * The function evaluates the shift/mult pair for the scaled math
* operations of clocksources and clockevents. * operations of clocksources and clockevents.
@ -122,7 +122,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
* NSEC_PER_SEC == 1GHz and @from is the counter frequency. For clock * NSEC_PER_SEC == 1GHz and @from is the counter frequency. For clock
* event @to is the counter frequency and @from is NSEC_PER_SEC. * event @to is the counter frequency and @from is NSEC_PER_SEC.
* *
* The @minsec conversion range argument controls the time frame in * The @maxsec conversion range argument controls the time frame in
* seconds which must be covered by the runtime conversion with the * seconds which must be covered by the runtime conversion with the
* calculated mult and shift factors. This guarantees that no 64bit * calculated mult and shift factors. This guarantees that no 64bit
* overflow happens when the input value of the conversion is * overflow happens when the input value of the conversion is
@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
* factors. * factors.
*/ */
void void
clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec) clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 maxsec)
{ {
u64 tmp; u64 tmp;
u32 sft, sftacc= 32; u32 sft, sftacc= 32;
@ -140,7 +140,7 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
* Calculate the shift factor which is limiting the conversion * Calculate the shift factor which is limiting the conversion
* range: * range:
*/ */
tmp = ((u64)minsec * from) >> 32; tmp = ((u64)maxsec * from) >> 32;
while (tmp) { while (tmp) {
tmp >>=1; tmp >>=1;
sftacc--; sftacc--;