linux-kernel - [tip: timers/core] linux/jiffies.h: Extract common header for vDSO

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Date:   Sat, 21 Mar 2020 14:33:28 -0000
From:   "tip-bot2 for Vincenzo Frascino" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: timers/core] linux/jiffies.h: Extract common header for vDSO

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     97b01d2eabd8c0fa650a9d513febeae35dbc6de4
Gitweb:        https://git.kernel.org/tip/97b01d2eabd8c0fa650a9d513febeae35dbc6de4
Author:        Vincenzo Frascino <vincenzo.frascino@....com>
AuthorDate:    Fri, 20 Mar 2020 14:53:38 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 21 Mar 2020 15:23:58 +01:00

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

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-14-vincenzo.frascino@arm.com

---
 include/linux/jiffies.h |  4 +---
 include/vdso/jiffies.h  | 11 +++++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)
 create mode 100644 include/vdso/jiffies.h

diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index e3279ef..fed6ba9 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -8,6 +8,7 @@
 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/timex.h>
+#include <vdso/jiffies.h>
 #include <asm/param.h>			/* for HZ */
 #include <generated/timeconst.h>
 
@@ -59,9 +60,6 @@
 
 extern int register_refined_jiffies(long clock_tick_rate);
 
-/* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
-#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
-
 /* TICK_USEC is the time between ticks in usec assuming SHIFTED_HZ */
 #define TICK_USEC ((USEC_PER_SEC + HZ/2) / HZ)
 
diff --git a/include/vdso/jiffies.h b/include/vdso/jiffies.h
new file mode 100644
index 0000000..2f9d596
--- /dev/null
+++ b/include/vdso/jiffies.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __VDSO_JIFFIES_H
+#define __VDSO_JIFFIES_H
+
+#include <asm/param.h>			/* for HZ */
+#include <vdso/time64.h>
+
+/* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
+#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
+
+#endif /* __VDSO_JIFFIES_H */