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Subject[tip: timers/core] linux/bits.h: Extract common header for vDSO
The following commit has been merged into the timers/core branch of tip:

Commit-ID: 3945ff37d2f48d39fd1751d282c80176654049e4
Gitweb: https://git.kernel.org/tip/3945ff37d2f48d39fd1751d282c80176654049e4
Author: Vincenzo Frascino <vincenzo.frascino@arm.com>
AuthorDate: Fri, 20 Mar 2020 14:53:27
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 21 Mar 2020 15:23:53 +01:00

linux/bits.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 bits.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/20200320145351.32292-3-vincenzo.frascino@arm.com

---
include/linux/bits.h | 2 +-
include/vdso/bits.h | 9 +++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
create mode 100644 include/vdso/bits.h

diff --git a/include/linux/bits.h b/include/linux/bits.h
index 669d694..a740bbc 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -3,9 +3,9 @@
#define __LINUX_BITS_H

#include <linux/const.h>
+#include <vdso/bits.h>
#include <asm/bitsperlong.h>

-#define BIT(nr) (UL(1) << (nr))
#define BIT_ULL(nr) (ULL(1) << (nr))
#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
diff --git a/include/vdso/bits.h b/include/vdso/bits.h
new file mode 100644
index 0000000..6d005a1
--- /dev/null
+++ b/include/vdso/bits.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __VDSO_BITS_H
+#define __VDSO_BITS_H
+
+#include <vdso/const.h>
+
+#define BIT(nr) (UL(1) << (nr))
+
+#endif /* __VDSO_BITS_H */
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