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locking/atomics/arm64: Replace our atomic/lock bitop implementations with asm-generic

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The <asm-generic/bitops/{atomic,lock}.h> implementations are built around
the atomic-fetch ops, which we implement efficiently for both LSE and
LL/SC systems. Use that instead of our hand-rolled, out-of-line bitops.S.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: yamada.masahiro@socionext.com
Link: https://lore.kernel.org/lkml/1529412794-17720-9-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Will Deacon
2018-06-19 13:53:13 +01:00
committed by Ingo Molnar
parent 84c6591103
commit 7c8fc35dfc
3 changed files with 3 additions and 89 deletions
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14
arch/arm64/include/asm/bitops.h
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@@ -17,22 +17,11 @@
#define __ASM_BITOPS_H
#include <linux/compiler.h>
#include <asm/barrier.h>
#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif
/*
* Little endian assembly atomic bitops.
*/
extern void set_bit(int nr, volatile unsigned long *p);
extern void clear_bit(int nr, volatile unsigned long *p);
extern void change_bit(int nr, volatile unsigned long *p);
extern int test_and_set_bit(int nr, volatile unsigned long *p);
extern int test_and_clear_bit(int nr, volatile unsigned long *p);
extern int test_and_change_bit(int nr, volatile unsigned long *p);
#include <asm-generic/bitops/builtin-__ffs.h>
#include <asm-generic/bitops/builtin-ffs.h>
#include <asm-generic/bitops/builtin-__fls.h>
@@ -44,8 +33,9 @@ extern int test_and_change_bit(int nr, volatile unsigned long *p);
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
#include <asm-generic/bitops/atomic.h>
#include <asm-generic/bitops/lock.h>
#include <asm-generic/bitops/non-atomic.h>
#include <asm-generic/bitops/le.h>