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9f61521c7a
Add a powerpc specific implementation of queued spinlocks. This is the build framework with a very simple (non-queued) spinlock implementation to begin with. Later changes add queueing, and other features and optimisations one-at-a-time. It is done this way to more easily see how the queued spinlocks are built, and to make performance and correctness bisects more useful. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Drop paravirt.h & processor.h changes to fix 32-bit build] [mpe: Fix 32-bit build of qspinlock.o & disallow GENERIC_LOCKBREAK per Nick] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/CONLLQB6DCJU.2ZPOS7T6S5GRR@bobo
21 lines
474 B
C
21 lines
474 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __ASM_SPINLOCK_H
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#define __ASM_SPINLOCK_H
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#ifdef __KERNEL__
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#ifdef CONFIG_PPC_QUEUED_SPINLOCKS
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#include <asm/qspinlock.h>
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#include <asm/qrwlock.h>
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#else
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#include <asm/simple_spinlock.h>
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#endif
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/* See include/linux/spinlock.h */
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#define smp_mb__after_spinlock() smp_mb()
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#ifndef CONFIG_PPC_QUEUED_SPINLOCKS
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static inline void pv_spinlocks_init(void) { }
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_SPINLOCK_H */
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