[09/19] linux/ktime.h: Extract common header for vDSO

Commit Message

Vincenzo Frascino Feb. 13, 2020, 4:16 p.m. UTC

The vDSO library should only include the necessary headers required for
a userspace library (UAPI and a minimal set of kernel headers). To make
this possible it is necessary to isolate from the kernel headers the
common parts that are strictly necessary to build the library.

Split ktime.h into linux and common headers to make the latter suitable
for inclusion in the vDSO library.

Signed-off-by: Vincenzo Frascino <[e-mail]>
---
 include/common/ktime.h | 16 ++++++++++++++++
 include/linux/ktime.h  |  9 +--------
 2 files changed, 17 insertions(+), 8 deletions(-)
 create mode 100644 include/common/ktime.h

Patch

diff --git a/include/common/ktime.h b/include/common/ktime.h
new file mode 100644
index 000000000000..4dd6c6762ad4
--- /dev/null
+++ b/include/common/ktime.h
@@ -0,0 +1,16 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __COMMON_KTIME_H
+#define __COMMON_KTIME_H
+
+#include <common/jiffies.h>
+
+/*
+ * 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 LOW_RES_NSEC		TICK_NSEC
+#define KTIME_LOW_RES		(LOW_RES_NSEC)
+
+#endif /* __COMMON_KTIME_H */
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index b2bb44f87f5a..0e1fadeb23c3 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -253,14 +253,7 @@  static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
 	}
 }
 
-/*
- * 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 LOW_RES_NSEC		TICK_NSEC
-#define KTIME_LOW_RES		(LOW_RES_NSEC)
+#include <common/ktime.h>
 
 static inline ktime_t ns_to_ktime(u64 ns)
 {