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locking/atomic: microblaze: use asm-generic exclusively 

Microblaze provides its own implementation of atomic_dec_if_positive(),
but nothing else. For a while now, the conditional inc/dec ops have been
optional, and the core code will provide generic implementations using
the code templates in scripts/atomic/fallbacks/.

For simplicity, and for consistency with the other conditional atomic
ops, let's drop the microblaze implementation of
atomic_dec_if_positive(), and use the generic implementation.

With that, we can also drop the local asm/atomic.h and asm/cmpxchg.h
headers, as asm-generic/atomic.h is mandatory-y, and we can pull in
asm-generic/cmpxchg.h via generic-y. This matches what nios2 and nds32
do today.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-5-mark.rutland@arm.com
This commit is contained in:
Mark Rutland 2021-05-25 15:02:03 +01:00 committed by Peter Zijlstra
parent c7178cdecd
commit b68622a86c
3 changed files with 1 additions and 37 deletions
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1
arch/microblaze/include/asm/Kbuild
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@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
generated-y += syscall_table.h
generic-y += cmpxchg.h
generic-y += extable.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h

28
arch/microblaze/include/asm/atomic.h
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@ -1,28 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_MICROBLAZE_ATOMIC_H
#define _ASM_MICROBLAZE_ATOMIC_H
#include <asm/cmpxchg.h>
#include <asm-generic/atomic.h>
#include <asm-generic/atomic64.h>
/*
* Atomically test *v and decrement if it is greater than 0.
* The function returns the old value of *v minus 1.
*/
static inline int atomic_dec_if_positive(atomic_t *v)
{
unsigned long flags;
int res;
local_irq_save(flags);
res = v->counter - 1;
if (res >= 0)
v->counter = res;
local_irq_restore(flags);
return res;
}
#define atomic_dec_if_positive atomic_dec_if_positive
#endif /* _ASM_MICROBLAZE_ATOMIC_H */

9
arch/microblaze/include/asm/cmpxchg.h
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@ -1,9 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_MICROBLAZE_CMPXCHG_H
#define _ASM_MICROBLAZE_CMPXCHG_H
#ifndef CONFIG_SMP
# include <asm-generic/cmpxchg.h>
#endif
#endif /* _ASM_MICROBLAZE_CMPXCHG_H */