[PATCH 3/3] always_inline timespec_add_ns

[PATCH 3/3] always_inline timespec_add_ns

[Jeremy Fitzhardinge]

timespec_add_ns is used from the x86-64 vdso, which cannot call out to
other kernel code.  Make sure that timespec_add_ns is always inlined
(and only uses always_inlined functions) to make sure there are no
unexpected calls.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
 include/linux/time.h |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

===================================================================
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -170,10 +170,13 @@
  * timespec_add_ns - Adds nanoseconds to a timespec
  * @a:		pointer to timespec to be incremented
  * @ns:		unsigned nanoseconds value to be added
+ *
+ * This must always be inlined because its used from the x86-64 vdso,
+ * which cannot call other kernel functions.
  */
-static inline void timespec_add_ns(struct timespec *a, u64 ns)
+static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
 {
-	a->tv_sec += iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
+	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
 	a->tv_nsec = ns;
 }
 #endif /* __KERNEL__ */