locking/atomic: sparc: 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/sparc.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-12-mark.rutland@arm.com

arch/sparc/include/asm/atomic_32.h

@@ -19,19 +19,31 @@
 #include <asm-generic/atomic64.h>
 
 int arch_atomic_add_return(int, atomic_t *);
+#define arch_atomic_add_return arch_atomic_add_return
+
 int arch_atomic_fetch_add(int, atomic_t *);
+#define arch_atomic_fetch_add arch_atomic_fetch_add
+
 int arch_atomic_fetch_and(int, atomic_t *);
+#define arch_atomic_fetch_and arch_atomic_fetch_and
+
 int arch_atomic_fetch_or(int, atomic_t *);
+#define arch_atomic_fetch_or arch_atomic_fetch_or
+
 int arch_atomic_fetch_xor(int, atomic_t *);
+#define arch_atomic_fetch_xor arch_atomic_fetch_xor
+
 int arch_atomic_cmpxchg(atomic_t *, int, int);
 #define arch_atomic_cmpxchg arch_atomic_cmpxchg
+
 int arch_atomic_xchg(atomic_t *, int);
 #define arch_atomic_xchg arch_atomic_xchg
-int arch_atomic_fetch_add_unless(atomic_t *, int, int);
-void arch_atomic_set(atomic_t *, int);
 
+int arch_atomic_fetch_add_unless(atomic_t *, int, int);
 #define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
 
+void arch_atomic_set(atomic_t *, int);
+
 #define arch_atomic_set_release(v, i)	arch_atomic_set((v), (i))
 
 #define arch_atomic_read(v)		READ_ONCE((v)->counter)

arch/sparc/include/asm/atomic_64.h

@@ -37,6 +37,16 @@ s64 arch_atomic64_fetch_##op(s64, atomic64_t *);
 ATOMIC_OPS(add)
 ATOMIC_OPS(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
+
+#define arch_atomic64_add_return		arch_atomic64_add_return
+#define arch_atomic64_sub_return		arch_atomic64_sub_return
+#define arch_atomic64_fetch_add			arch_atomic64_fetch_add
+#define arch_atomic64_fetch_sub			arch_atomic64_fetch_sub
+
 #undef ATOMIC_OPS
 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
 
@@ -44,6 +54,14 @@ ATOMIC_OPS(and)
 ATOMIC_OPS(or)
 ATOMIC_OPS(xor)
 
+#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
+
+#define arch_atomic64_fetch_and			arch_atomic64_fetch_and
+#define arch_atomic64_fetch_or			arch_atomic64_fetch_or
+#define arch_atomic64_fetch_xor			arch_atomic64_fetch_xor
+
 #undef ATOMIC_OPS
 #undef ATOMIC_FETCH_OP
 #undef ATOMIC_OP_RETURN