[-mm PATCH 1/32] include: update jiffies/{m,u}secs conversion functions

Nishanth Aravamudan
2005-08-15T18:06:20Z

Description: Clarify the human-time units to jiffies conversion
functions by using the constants in time.h. This makes many of the
subsequent patches direct copies of the current code.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>

---

include/linux/jiffies.h | 40 ++++++++++++++++++++--------------------
include/linux/time.h | 4 ++++
2 files changed, 24 insertions(+), 20 deletions(-)

--- 2.6.13-rc5-mm1/include/linux/time.h 2005-03-01 23:38:12.000000000 -0800
+++ 2.6.13-rc5-mm1-dev/include/linux/time.h 2005-08-14 12:53:17.000000000 -0700
@@ -28,6 +28,10 @@ struct timezone {
#ifdef __KERNEL__

/* Parameters used to convert the timespec values */
+#ifndef MSEC_PER_SEC
+#define MSEC_PER_SEC (1000L)
+#endif
+
#ifndef USEC_PER_SEC
#define USEC_PER_SEC (1000000L)
#endif
diff -urpN 2.6.13-rc5-mm1/include/linux/jiffies.h 2.6.13-rc5-mm1-dev/include/linux/jiffies.h
--- 2.6.13-rc5-mm1/include/linux/jiffies.h 2005-03-01 23:37:31.000000000 -0800
+++ 2.6.13-rc5-mm1-dev/include/linux/jiffies.h 2005-08-10 23:31:04.000000000 -0700
@@ -254,23 +254,23 @@ static inline u64 get_jiffies_64(void)
*/
static inline unsigned int jiffies_to_msecs(const unsigned long j)
{
-#if HZ <= 1000 && !(1000 % HZ)
- return (1000 / HZ) * j;
-#elif HZ > 1000 && !(HZ % 1000)
- return (j + (HZ / 1000) - 1)/(HZ / 1000);
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+ return (MSEC_PER_SEC / HZ) * j;
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+ return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
#else
- return (j * 1000) / HZ;
+ return (j * MSEC_PER_SEC) / HZ;
#endif
}

static inline unsigned int jiffies_to_usecs(const unsigned long j)
{
-#if HZ <= 1000000 && !(1000000 % HZ)
- return (1000000 / HZ) * j;
-#elif HZ > 1000000 && !(HZ % 1000000)
- return (j + (HZ / 1000000) - 1)/(HZ / 1000000);
+#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
+ return (USEC_PER_SEC / HZ) * j;
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+ return (j + (HZ / USEC_PER_SEC) - 1)/(HZ / USEC_PER_SEC);
#else
- return (j * 1000000) / HZ;
+ return (j * USEC_PER_SEC) / HZ;
#endif
}

@@ -278,12 +278,12 @@ static inline unsigned long msecs_to_jif
{
if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
return MAX_JIFFY_OFFSET;
-#if HZ <= 1000 && !(1000 % HZ)
- return (m + (1000 / HZ) - 1) / (1000 / HZ);
-#elif HZ > 1000 && !(HZ % 1000)
- return m * (HZ / 1000);
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+ return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+ return m * (HZ / MSEC_PER_SEC);
#else
- return (m * HZ + 999) / 1000;
+ return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
#endif
}

@@ -291,12 +291,12 @@ static inline unsigned long usecs_to_jif
{
if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
return MAX_JIFFY_OFFSET;
-#if HZ <= 1000000 && !(1000000 % HZ)
- return (u + (1000000 / HZ) - 1) / (1000000 / HZ);
-#elif HZ > 1000000 && !(HZ % 1000000)
- return u * (HZ / 1000000);
+#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
+ return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ);
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+ return u * (HZ / USEC_PER_SEC);
#else
- return (u * HZ + 999999) / 1000000;
+ return (u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
#endif
}