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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
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:27 +00:00 committed by Thomas Gleixner
parent 8165b57bca
commit 3945ff37d2
2 changed files with 10 additions and 1 deletions
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2
include/linux/bits.h
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@ -3,9 +3,9 @@
#define __LINUX_BITS_H #define __LINUX_BITS_H
#include <linux/const.h> #include <linux/const.h>
#include <vdso/bits.h>
#include <asm/bitsperlong.h> #include <asm/bitsperlong.h>
#define BIT(nr) (UL(1) << (nr))
#define BIT_ULL(nr) (ULL(1) << (nr)) #define BIT_ULL(nr) (ULL(1) << (nr))
#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)

9
include/vdso/bits.h Normal file
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@ -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 */