Merge tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking updates from Ingo Molnar:

 - Introduce cmpxchg128() -- aka. the demise of cmpxchg_double()

   The cmpxchg128() family of functions is basically & functionally the
   same as cmpxchg_double(), but with a saner interface.

   Instead of a 6-parameter horror that forced u128 - u64/u64-halves
   layout details on the interface and exposed users to complexity,
   fragility & bugs, use a natural 3-parameter interface with u128
   types.

 - Restructure the generated atomic headers, and add kerneldoc comments
   for all of the generic atomic{,64,_long}_t operations.

   The generated definitions are much cleaner now, and come with
   documentation.

 - Implement lock_set_cmp_fn() on lockdep, for defining an ordering when
   taking multiple locks of the same type.

   This gets rid of one use of lockdep_set_novalidate_class() in the
   bcache code.

 - Fix raw_cpu_generic_try_cmpxchg() bug due to an unintended variable
   shadowing generating garbage code on Clang on certain ARM builds.

* tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (43 commits)
  locking/atomic: scripts: fix ${atomic}_dec_if_positive() kerneldoc
  percpu: Fix self-assignment of __old in raw_cpu_generic_try_cmpxchg()
  locking/atomic: treewide: delete arch_atomic_*() kerneldoc
  locking/atomic: docs: Add atomic operations to the driver basic API documentation
  locking/atomic: scripts: generate kerneldoc comments
  docs: scripts: kernel-doc: accept bitwise negation like ~@var
  locking/atomic: scripts: simplify raw_atomic*() definitions
  locking/atomic: scripts: simplify raw_atomic_long*() definitions
  locking/atomic: scripts: split pfx/name/sfx/order
  locking/atomic: scripts: restructure fallback ifdeffery
  locking/atomic: scripts: build raw_atomic_long*() directly
  locking/atomic: treewide: use raw_atomic*_<op>()
  locking/atomic: scripts: add trivial raw_atomic*_<op>()
  locking/atomic: scripts: factor out order template generation
  locking/atomic: scripts: remove leftover "${mult}"
  locking/atomic: scripts: remove bogus order parameter
  locking/atomic: xtensa: add preprocessor symbols
  locking/atomic: x86: add preprocessor symbols
  locking/atomic: sparc: add preprocessor symbols
  locking/atomic: sh: add preprocessor symbols
  ...

2 files changed, 34 insertions, 13 deletions

diff --git a/arch/sparc/include/asm/atomic_32.h b/arch/sparc/include/asm/atomic_32.h
index d775daa83d12..60ce2fe57fcd 100644
--- a/arch/sparc/include/asm/atomic_32.h
+++ b/arch/sparc/include/asm/atomic_32.h
@@ -19,17 +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);
-int arch_atomic_fetch_add_unless(atomic_t *, int, int);
-void arch_atomic_set(atomic_t *, int);
+#define arch_atomic_xchg arch_atomic_xchg
 
+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)
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h
index 077891686715..a5e9c37605a7 100644
--- a/arch/sparc/include/asm/atomic_64.h
+++ b/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)
 
@@ -44,22 +54,19 @@ 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
 #undef ATOMIC_OP
 
-#define arch_atomic_cmpxchg(v, o, n) (arch_cmpxchg(&((v)->counter), (o), (n)))
-
-static inline int arch_atomic_xchg(atomic_t *v, int new)
-{
-	return arch_xchg(&v->counter, new);
-}
-
-#define arch_atomic64_cmpxchg(v, o, n) \
-	((__typeof__((v)->counter))arch_cmpxchg(&((v)->counter), (o), (n)))
-#define arch_atomic64_xchg(v, new) (arch_xchg(&((v)->counter), new))
-
 s64 arch_atomic64_dec_if_positive(atomic64_t *v);
 #define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive