linux-kernel - [PATCH 08/26] locking/atomic: m68k: add preprocessor symbols

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Message-Id: <20230522122429.1915021-9-mark.rutland@arm.com>
Date:   Mon, 22 May 2023 13:24:11 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     linux-kernel@...r.kernel.org
Cc:     akiyks@...il.com, boqun.feng@...il.com, corbet@....net,
        keescook@...omium.org, linux-arch@...r.kernel.org,
        linux@...linux.org.uk, linux-doc@...r.kernel.org,
        mark.rutland@....com, paulmck@...nel.org, peterz@...radead.org,
        sstabellini@...nel.org, will@...nel.org
Subject: [PATCH 08/26] locking/atomic: m68k: add preprocessor symbols

Some atomics can be implemented in several different ways, e.g.
FULL/ACQUIRE/RELEASE ordered atomics can be implemented in terms of
RELAXED atomics, and ACQUIRE/RELEASE/RELAXED can be implemented in terms
of FULL ordered atomics. Other atomics are optional, and don't exist in
some configurations (e.g. not all architectures implement the 128-bit
cmpxchg ops).

Subsequent patches will require that architectures define a preprocessor
symbol for any atomic (or ordering variant) which is optional. This will
make the fallback ifdeffery more robust, and simplify future changes.

Add the required definitions to arch/m68k.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will@...nel.org>
---
 arch/m68k/include/asm/atomic.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/m68k/include/asm/atomic.h b/arch/m68k/include/asm/atomic.h
index 190a032f19be7..4bfbc25f6ecf4 100644
--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -106,6 +106,11 @@ static inline int arch_atomic_fetch_##op(int i, atomic_t * v)		\
 ATOMIC_OPS(add, +=, add)
 ATOMIC_OPS(sub, -=, sub)
 
+#define arch_atomic_add_return			arch_atomic_add_return
+#define arch_atomic_sub_return			arch_atomic_sub_return
+#define arch_atomic_fetch_add			arch_atomic_fetch_add
+#define arch_atomic_fetch_sub			arch_atomic_fetch_sub
+
 #undef ATOMIC_OPS
 #define ATOMIC_OPS(op, c_op, asm_op)					\
 	ATOMIC_OP(op, c_op, asm_op)					\
@@ -115,6 +120,10 @@ ATOMIC_OPS(and, &=, and)
 ATOMIC_OPS(or, |=, or)
 ATOMIC_OPS(xor, ^=, eor)
 
+#define arch_atomic_fetch_and			arch_atomic_fetch_and
+#define arch_atomic_fetch_or			arch_atomic_fetch_or
+#define arch_atomic_fetch_xor			arch_atomic_fetch_xor
+
 #undef ATOMIC_OPS
 #undef ATOMIC_FETCH_OP
 #undef ATOMIC_OP_RETURN
-- 
2.30.2