linux/ktime.h: Extract common header for vDSO

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 <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-15-vincenzo.frascino@arm.com

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index b2bb44f87f5a3edb6ee6f179c83fcde42a363fe5..1fcfce97a020284093c28bcef815ec12ec32cc72 100644 (file)
--- 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 <vdso/ktime.h>
 
 static inline ktime_t ns_to_ktime(u64 ns)
 {

diff --git a/include/vdso/ktime.h b/include/vdso/ktime.h
new file mode 100644 (file)
index 0000000..a0fd072
--- /dev/null
+++ b/include/vdso/ktime.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __VDSO_KTIME_H
+#define __VDSO_KTIME_H
+
+#include <vdso/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 /* __VDSO_KTIME_H */