Fix recursive lock in free_uid()/free_user_ns()

[safe/jmp/linux-2.6] / include / linux / ktime.h

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 2b139f6..ce59832 100644 (file)
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -102,6 +102,13 @@ static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
 #define ktime_add_ns(kt, nsval) \
                ({ (ktime_t){ .tv64 = (kt).tv64 + (nsval) }; })
 
+/*
+ * Subtract a scalar nanosecod from a ktime_t variable
+ * res = kt - nsval:
+ */
+#define ktime_sub_ns(kt, nsval) \
+               ({ (ktime_t){ .tv64 = (kt).tv64 - (nsval) }; })
+
 /* convert a timespec to ktime_t format: */
 static inline ktime_t timespec_to_ktime(struct timespec ts)
 {
@@ -200,6 +207,15 @@ static inline ktime_t ktime_add(const ktime_t add1, const ktime_t add2)
 extern ktime_t ktime_add_ns(const ktime_t kt, u64 nsec);
 
 /**
+ * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable
+ * @kt:                minuend
+ * @nsec:      the scalar nsec value to subtract
+ *
+ * Returns the subtraction of @nsec from @kt in ktime_t format
+ */
+extern ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec);
+
+/**
  * timespec_to_ktime - convert a timespec to ktime_t format
  * @ts:                the timespec variable to convert
  *
@@ -279,13 +295,31 @@ static inline s64 ktime_to_us(const ktime_t kt)
        return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
 }
 
+static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
+{
+       return ktime_to_us(ktime_sub(later, earlier));
+}
+
+static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
+{
+       return ktime_add_ns(kt, usec * 1000);
+}
+
+static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
+{
+       return ktime_sub_ns(kt, usec * 1000);
+}
+
+extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
+
 /*
  * The resolution of the clocks. The resolution value is returned in
  * the clock_getres() system call to give application programmers an
  * idea of the (in)accuracy of timers. Timer values are rounded up to
  * this resolution values.
  */
-#define KTIME_LOW_RES          (ktime_t){ .tv64 = TICK_NSEC }
+#define LOW_RES_NSEC           TICK_NSEC
+#define KTIME_LOW_RES          (ktime_t){ .tv64 = LOW_RES_NSEC }
 
 /* Get the monotonic time in timespec format: */
 extern void ktime_get_ts(struct timespec *ts);
@@ -293,4 +327,10 @@ extern void ktime_get_ts(struct timespec *ts);
 /* Get the real (wall-) time in timespec format: */
 #define ktime_get_real_ts(ts)  getnstimeofday(ts)
 
+static inline ktime_t ns_to_ktime(u64 ns)
+{
+       static const ktime_t ktime_zero = { .tv64 = 0 };
+       return ktime_add_ns(ktime_zero, ns);
+}
+
 #endif