locking/atomic: Use s64 for atomic64

As a step towards making the atomic64 API use consistent types treewide,
let's have the generic atomic64 implementation use s64 as the underlying
type for atomic64_t, rather than long long, matching the generated
headers.

Otherwise, there should be no functional change as a result of this
patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aou@eecs.berkeley.edu
Cc: bp@alien8.de
Cc: catalin.marinas@arm.com
Cc: davem@davemloft.net
Cc: fenghua.yu@intel.com
Cc: heiko.carstens@de.ibm.com
Cc: herbert@gondor.apana.org.au
Cc: ink@jurassic.park.msu.ru
Cc: jhogan@kernel.org
Cc: linux@armlinux.org.uk
Cc: mattst88@gmail.com
Cc: mpe@ellerman.id.au
Cc: palmer@sifive.com
Cc: paul.burton@mips.com
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: rth@twiddle.net
Cc: tony.luck@intel.com
Cc: vgupta@synopsys.com
Link: https://lkml.kernel.org/r/20190522132250.26499-4-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Author: mrutland-arm

include/asm-generic/atomic64.h

@@ -10,24 +10,24 @@
 #include <linux/types.h>
 
 typedef struct {
-	long long counter;
+	s64 counter;
 } atomic64_t;
 
 #define ATOMIC64_INIT(i)	{ (i) }
 
-extern long long atomic64_read(const atomic64_t *v);
-extern void	 atomic64_set(atomic64_t *v, long long i);
+extern s64 atomic64_read(const atomic64_t *v);
+extern void atomic64_set(atomic64_t *v, s64 i);
 
 #define atomic64_set_release(v, i)	atomic64_set((v), (i))
 
 #define ATOMIC64_OP(op)							\
-extern void	 atomic64_##op(long long a, atomic64_t *v);
+extern void	 atomic64_##op(s64 a, atomic64_t *v);
 
 #define ATOMIC64_OP_RETURN(op)						\
-extern long long atomic64_##op##_return(long long a, atomic64_t *v);
+extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
 
 #define ATOMIC64_FETCH_OP(op)						\
-extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
+extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
 
 #define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
 
@@ -46,11 +46,11 @@ ATOMIC64_OPS(xor)
 #undef ATOMIC64_OP_RETURN
 #undef ATOMIC64_OP
 
-extern long long atomic64_dec_if_positive(atomic64_t *v);
+extern s64 atomic64_dec_if_positive(atomic64_t *v);
 #define atomic64_dec_if_positive atomic64_dec_if_positive
-extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
-extern long long atomic64_xchg(atomic64_t *v, long long new);
-extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);
+extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
+extern s64 atomic64_xchg(atomic64_t *v, s64 new);
+extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
 #define atomic64_fetch_add_unless atomic64_fetch_add_unless
 
 #endif  /*  _ASM_GENERIC_ATOMIC64_H  */

lib/atomic64.c

@@ -42,11 +42,11 @@ static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
 	return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
 }
 
-long long atomic64_read(const atomic64_t *v)
+s64 atomic64_read(const atomic64_t *v)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
-	long long val;
+	s64 val;
 
 	raw_spin_lock_irqsave(lock, flags);
 	val = v->counter;
@@ -55,7 +55,7 @@ long long atomic64_read(const atomic64_t *v)
 }
 EXPORT_SYMBOL(atomic64_read);
 
-void atomic64_set(atomic64_t *v, long long i)
+void atomic64_set(atomic64_t *v, s64 i)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
@@ -67,7 +67,7 @@ void atomic64_set(atomic64_t *v, long long i)
 EXPORT_SYMBOL(atomic64_set);
 
 #define ATOMIC64_OP(op, c_op)						\
-void atomic64_##op(long long a, atomic64_t *v)				\
+void atomic64_##op(s64 a, atomic64_t *v)				\
 {									\
 	unsigned long flags;						\
 	raw_spinlock_t *lock = lock_addr(v);				\
@@ -79,11 +79,11 @@ void atomic64_##op(long long a, atomic64_t *v)				\
 EXPORT_SYMBOL(atomic64_##op);
 
 #define ATOMIC64_OP_RETURN(op, c_op)					\
-long long atomic64_##op##_return(long long a, atomic64_t *v)		\
+s64 atomic64_##op##_return(s64 a, atomic64_t *v)			\
 {									\
 	unsigned long flags;						\
 	raw_spinlock_t *lock = lock_addr(v);				\
-	long long val;							\
+	s64 val;							\
 									\
 	raw_spin_lock_irqsave(lock, flags);				\
 	val = (v->counter c_op a);					\
@@ -93,11 +93,11 @@ long long atomic64_##op##_return(long long a, atomic64_t *v)		\
 EXPORT_SYMBOL(atomic64_##op##_return);
 
 #define ATOMIC64_FETCH_OP(op, c_op)					\
-long long atomic64_fetch_##op(long long a, atomic64_t *v)		\
+s64 atomic64_fetch_##op(s64 a, atomic64_t *v)				\
 {									\
 	unsigned long flags;						\
 	raw_spinlock_t *lock = lock_addr(v);				\
-	long long val;							\
+	s64 val;							\
 									\
 	raw_spin_lock_irqsave(lock, flags);				\
 	val = v->counter;						\
@@ -130,11 +130,11 @@ ATOMIC64_OPS(xor, ^=)
 #undef ATOMIC64_OP_RETURN
 #undef ATOMIC64_OP
 
-long long atomic64_dec_if_positive(atomic64_t *v)
+s64 atomic64_dec_if_positive(atomic64_t *v)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
-	long long val;
+	s64 val;
 
 	raw_spin_lock_irqsave(lock, flags);
 	val = v->counter - 1;
@@ -145,11 +145,11 @@ long long atomic64_dec_if_positive(atomic64_t *v)
 }
 EXPORT_SYMBOL(atomic64_dec_if_positive);
 
-long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
+s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
-	long long val;
+	s64 val;
 
 	raw_spin_lock_irqsave(lock, flags);
 	val = v->counter;
@@ -160,11 +160,11 @@ long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
 }
 EXPORT_SYMBOL(atomic64_cmpxchg);
 
-long long atomic64_xchg(atomic64_t *v, long long new)
+s64 atomic64_xchg(atomic64_t *v, s64 new)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
-	long long val;
+	s64 val;
 
 	raw_spin_lock_irqsave(lock, flags);
 	val = v->counter;
@@ -174,11 +174,11 @@ long long atomic64_xchg(atomic64_t *v, long long new)
 }
 EXPORT_SYMBOL(atomic64_xchg);
 
-long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u)
+s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
 {
 	unsigned long flags;
 	raw_spinlock_t *lock = lock_addr(v);
-	long long val;
+	s64 val;
 
 	raw_spin_lock_irqsave(lock, flags);
 	val = v->counter;