locking/atomic: m68k: move to ARCH_ATOMIC

We'd like all architectures to convert to ARCH_ATOMIC, as once all
architectures are converted it will be possible to make significant
cleanups to the atomics headers, and this will make it much easier to
generically enable atomic functionality (e.g. debug logic in the
instrumented wrappers).

As a step towards that, this patch migrates m68k to ARCH_ATOMIC. The
arch code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common
code wraps these with optional instrumentation to provide the regular
functions.

While atomic_dec_and_test_lt() is not part of the common atomic API, it
is also given an `arch_` prefix for consistency.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
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/20210525140232.53872-21-mark.rutland@arm.com

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index a5d358855878..8ed6ac14d99f 100644
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -31,7 +31,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
 
 	if (mm->context != NO_CONTEXT)
 		return;
-	while (atomic_dec_and_test_lt(&nr_free_contexts)) {
+	while (arch_atomic_dec_and_test_lt(&nr_free_contexts)) {
 		atomic_inc(&nr_free_contexts);
 		steal_context();
 	}