forked from Minki/linux
cpuset: Replace all instances of time_t with time64_t
The following patch replaces all instances of time_t with time64_t i.e. change the type used for representing time from 32-bit to 64-bit. All 32-bit kernels to date use a signed 32-bit time_t type, which can only represent time until January 2038. Since embedded systems running 32-bit Linux are going to survive beyond that date, we have to change all current uses, in a backwards compatible way. The patch also changes the function get_seconds() that returns a 32-bit integer to ktime_get_seconds() that returns seconds as 64-bit integer. The patch changes the type of ticks from time_t to u32. We keep ticks as 32-bits as the function uses 32-bit arithmetic which would prove less expensive than 64-bit arithmetic and the function is expected to be called atleast once every 32 seconds. Signed-off-by: Heena Sirwani <heenasirwani@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -51,6 +51,7 @@
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/time.h>
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#include <linux/time64.h>
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#include <linux/backing-dev.h>
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#include <linux/sort.h>
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@ -68,7 +69,7 @@ struct static_key cpusets_enabled_key __read_mostly = STATIC_KEY_INIT_FALSE;
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struct fmeter {
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int cnt; /* unprocessed events count */
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int val; /* most recent output value */
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time_t time; /* clock (secs) when val computed */
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time64_t time; /* clock (secs) when val computed */
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spinlock_t lock; /* guards read or write of above */
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};
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@ -1374,7 +1375,7 @@ out:
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*/
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#define FM_COEF 933 /* coefficient for half-life of 10 secs */
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#define FM_MAXTICKS ((time_t)99) /* useless computing more ticks than this */
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#define FM_MAXTICKS ((u32)99) /* useless computing more ticks than this */
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#define FM_MAXCNT 1000000 /* limit cnt to avoid overflow */
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#define FM_SCALE 1000 /* faux fixed point scale */
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@ -1390,8 +1391,11 @@ static void fmeter_init(struct fmeter *fmp)
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/* Internal meter update - process cnt events and update value */
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static void fmeter_update(struct fmeter *fmp)
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{
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time_t now = get_seconds();
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time_t ticks = now - fmp->time;
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time64_t now;
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u32 ticks;
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now = ktime_get_seconds();
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ticks = now - fmp->time;
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if (ticks == 0)
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return;
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