r8169: align the IP header when there is no DMA constraint

[linux-2.6-omap-h63xx.git] / kernel / time.c

diff --git a/kernel/time.c b/kernel/time.c
index 4a865717158442254a59fb6eb4889cfe9098eb23..f04791f694081d16dab799ae16f5b3f405683e4d 100644 (file)
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -31,7 +31,6 @@
 #include <linux/timex.h>
 #include <linux/capability.h>
 #include <linux/errno.h>
-#include <linux/smp_lock.h>
 #include <linux/syscalls.h>
 #include <linux/security.h>
 #include <linux/fs.h>
@@ -247,6 +246,36 @@ struct timespec current_fs_time(struct super_block *sb)
 }
 EXPORT_SYMBOL(current_fs_time);
 
+/*
+ * Convert jiffies to milliseconds and back.
+ *
+ * Avoid unnecessary multiplications/divisions in the
+ * two most common HZ cases:
+ */
+unsigned int inline jiffies_to_msecs(const unsigned long j)
+{
+#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 * MSEC_PER_SEC) / HZ;
+#endif
+}
+EXPORT_SYMBOL(jiffies_to_msecs);
+
+unsigned int inline jiffies_to_usecs(const unsigned long j)
+{
+#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 * USEC_PER_SEC) / HZ;
+#endif
+}
+EXPORT_SYMBOL(jiffies_to_usecs);
+
 /**
  * timespec_trunc - Truncate timespec to a granularity
  * @t: Timespec
@@ -452,6 +481,7 @@ struct timespec ns_to_timespec(const s64 nsec)
 
        return ts;
 }
+EXPORT_SYMBOL(ns_to_timespec);
 
 /**
  * ns_to_timeval - Convert nanoseconds to timeval
@@ -469,46 +499,58 @@ struct timeval ns_to_timeval(const s64 nsec)
 
        return tv;
 }
+EXPORT_SYMBOL(ns_to_timeval);
 
 /*
- * Convert jiffies to milliseconds and back.
+ * When we convert to jiffies then we interpret incoming values
+ * the following way:
  *
- * Avoid unnecessary multiplications/divisions in the
- * two most common HZ cases:
+ * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)
+ *
+ * - 'too large' values [that would result in larger than
+ *   MAX_JIFFY_OFFSET values] mean 'infinite timeout' too.
+ *
+ * - all other values are converted to jiffies by either multiplying
+ *   the input value by a factor or dividing it with a factor
+ *
+ * We must also be careful about 32-bit overflows.
  */
-unsigned int jiffies_to_msecs(const unsigned long j)
-{
-#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 * MSEC_PER_SEC) / HZ;
-#endif
-}
-EXPORT_SYMBOL(jiffies_to_msecs);
-
-unsigned int jiffies_to_usecs(const unsigned long j)
-{
-#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 * USEC_PER_SEC) / HZ;
-#endif
-}
-EXPORT_SYMBOL(jiffies_to_usecs);
-
 unsigned long msecs_to_jiffies(const unsigned int m)
 {
-       if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
+       /*
+        * Negative value, means infinite timeout:
+        */
+       if ((int)m < 0)
                return MAX_JIFFY_OFFSET;
+
 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+       /*
+        * HZ is equal to or smaller than 1000, and 1000 is a nice
+        * round multiple of HZ, divide with the factor between them,
+        * but round upwards:
+        */
        return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+       /*
+        * HZ is larger than 1000, and HZ is a nice round multiple of
+        * 1000 - simply multiply with the factor between them.
+        *
+        * But first make sure the multiplication result cannot
+        * overflow:
+        */
+       if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
+               return MAX_JIFFY_OFFSET;
+
        return m * (HZ / MSEC_PER_SEC);
 #else
+       /*
+        * Generic case - multiply, round and divide. But first
+        * check that if we are doing a net multiplication, that
+        * we wouldnt overflow:
+        */
+       if (HZ > MSEC_PER_SEC && m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
+               return MAX_JIFFY_OFFSET;
+
        return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
 #endif
 }
@@ -594,6 +636,7 @@ timeval_to_jiffies(const struct timeval *value)
                (((u64)usec * USEC_CONVERSION + USEC_ROUND) >>
                 (USEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
 }
+EXPORT_SYMBOL(timeval_to_jiffies);
 
 void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
 {
@@ -608,6 +651,7 @@ void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
        tv_usec /= NSEC_PER_USEC;
        value->tv_usec = tv_usec;
 }
+EXPORT_SYMBOL(jiffies_to_timeval);
 
 /*
  * Convert jiffies/jiffies_64 to clock_t and back.