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Date: Mon, 10 May 2021 10:37:30 +0100
From: Mark Rutland <mark.rutland@....com>
To: linux-kernel@...r.kernel.org, will@...nel.org,
boqun.feng@...il.com, peterz@...radead.org
Cc: aou@...s.berkeley.edu, arnd@...db.de, bcain@...eaurora.org,
benh@...nel.crashing.org, chris@...kel.net, dalias@...c.org,
davem@...emloft.net, deanbo422@...il.com, deller@....de,
geert@...ux-m68k.org, green.hu@...il.com, guoren@...nel.org,
ink@...assic.park.msu.ru, James.Bottomley@...senPartnership.com,
jcmvbkbc@...il.com, jonas@...thpole.se, ley.foon.tan@...el.com,
linux@...linux.org.uk, mark.rutland@....com, mattst88@...il.com,
monstr@...str.eu, mpe@...erman.id.au, nickhu@...estech.com,
palmer@...belt.com, paulus@...ba.org, paul.walmsley@...ive.com,
rth@...ddle.net, shorne@...il.com,
stefan.kristiansson@...nalahti.fi, tsbogend@...ha.franken.de,
vgupta@...opsys.com, ysato@...rs.sourceforge.jp
Subject: [PATCH 10/33] locking/atomic: atomic64: support ARCH_ATOMIC
We'd like all architectures to convert to ARCH_ATOMIC, as this will
enable functionality, and once all architectures are converted it will
be possible to make significant cleanups to the atomic headers.
A number of architectures use asm-generic/atomic64.h, and it's
impractical to convert the header and all these architectures in one go.
To make it possible to convert them one-by-one, let's make the
asm-generic implementation function as either atomic64_*() or
arch_atomic64_*() depending on whether ARCH_ATOMIC is selected. To do
this, the generic implementations are prefixed as generic_atomic64_*(),
and preprocessor definitions map atomic64_*()/arch_atomic64_*() onto
these as appropriate.
Once all users are moved over to ARCH_ATOMIC the ifdeffery in the header
can be simplified and/or removed entirely.
For existing users (none of which select ARCH_ATOMIC), there should be
no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will@...nel.org>
---
include/asm-generic/atomic64.h | 74 ++++++++++++++++++++++++++++++++++--------
lib/atomic64.c | 36 ++++++++++----------
2 files changed, 79 insertions(+), 31 deletions(-)
diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h
index 370f01d4450f..c8c7d9fae820 100644
--- a/include/asm-generic/atomic64.h
+++ b/include/asm-generic/atomic64.h
@@ -15,19 +15,17 @@ typedef struct {
#define ATOMIC64_INIT(i) { (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))
+extern s64 generic_atomic64_read(const atomic64_t *v);
+extern void generic_atomic64_set(atomic64_t *v, s64 i);
#define ATOMIC64_OP(op) \
-extern void atomic64_##op(s64 a, atomic64_t *v);
+extern void generic_atomic64_##op(s64 a, atomic64_t *v);
#define ATOMIC64_OP_RETURN(op) \
-extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
+extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
#define ATOMIC64_FETCH_OP(op) \
-extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
+extern s64 generic_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 +44,61 @@ ATOMIC64_OPS(xor)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
-extern s64 atomic64_dec_if_positive(atomic64_t *v);
-#define atomic64_dec_if_positive atomic64_dec_if_positive
-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
+extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
+extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
+extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
+extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
+
+#ifdef CONFIG_ARCH_ATOMIC
+
+#define arch_atomic64_read generic_atomic64_read
+#define arch_atomic64_set generic_atomic64_set
+#define arch_atomic64_set_release generic_atomic64_set
+
+#define arch_atomic64_add generic_atomic64_add
+#define arch_atomic64_add_return generic_atomic64_add_return
+#define arch_atomic64_fetch_add generic_atomic64_fetch_add
+#define arch_atomic64_sub generic_atomic64_sub
+#define arch_atomic64_sub_return generic_atomic64_sub_return
+#define arch_atomic64_fetch_sub generic_atomic64_fetch_sub
+
+#define arch_atomic64_and generic_atomic64_and
+#define arch_atomic64_fetch_and generic_atomic64_fetch_and
+#define arch_atomic64_or generic_atomic64_or
+#define arch_atomic64_fetch_or generic_atomic64_fetch_or
+#define arch_atomic64_xor generic_atomic64_xor
+#define arch_atomic64_fetch_xor generic_atomic64_fetch_xor
+
+#define arch_atomic64_dec_if_positive generic_atomic64_dec_if_positive
+#define arch_atomic64_cmpxchg generic_atomic64_cmpxchg
+#define arch_atomic64_xchg generic_atomic64_xchg
+#define arch_atomic64_fetch_add_unless generic_atomic64_fetch_add_unless
+
+#else /* CONFIG_ARCH_ATOMIC */
+
+#define atomic64_read generic_atomic64_read
+#define atomic64_set generic_atomic64_set
+#define atomic64_set_release generic_atomic64_set
+
+#define atomic64_add generic_atomic64_add
+#define atomic64_add_return generic_atomic64_add_return
+#define atomic64_fetch_add generic_atomic64_fetch_add
+#define atomic64_sub generic_atomic64_sub
+#define atomic64_sub_return generic_atomic64_sub_return
+#define atomic64_fetch_sub generic_atomic64_fetch_sub
+
+#define atomic64_and generic_atomic64_and
+#define atomic64_fetch_and generic_atomic64_fetch_and
+#define atomic64_or generic_atomic64_or
+#define atomic64_fetch_or generic_atomic64_fetch_or
+#define atomic64_xor generic_atomic64_xor
+#define atomic64_fetch_xor generic_atomic64_fetch_xor
+
+#define atomic64_dec_if_positive generic_atomic64_dec_if_positive
+#define atomic64_cmpxchg generic_atomic64_cmpxchg
+#define atomic64_xchg generic_atomic64_xchg
+#define atomic64_fetch_add_unless generic_atomic64_fetch_add_unless
+
+#endif /* CONFIG_ARCH_ATOMIC */
#endif /* _ASM_GENERIC_ATOMIC64_H */
diff --git a/lib/atomic64.c b/lib/atomic64.c
index e98c85a99787..3df653994177 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -42,7 +42,7 @@ static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
}
-s64 atomic64_read(const atomic64_t *v)
+s64 generic_atomic64_read(const atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -53,9 +53,9 @@ s64 atomic64_read(const atomic64_t *v)
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
-EXPORT_SYMBOL(atomic64_read);
+EXPORT_SYMBOL(generic_atomic64_read);
-void atomic64_set(atomic64_t *v, s64 i)
+void generic_atomic64_set(atomic64_t *v, s64 i)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -64,10 +64,10 @@ void atomic64_set(atomic64_t *v, s64 i)
v->counter = i;
raw_spin_unlock_irqrestore(lock, flags);
}
-EXPORT_SYMBOL(atomic64_set);
+EXPORT_SYMBOL(generic_atomic64_set);
#define ATOMIC64_OP(op, c_op) \
-void atomic64_##op(s64 a, atomic64_t *v) \
+void generic_atomic64_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
@@ -76,10 +76,10 @@ void atomic64_##op(s64 a, atomic64_t *v) \
v->counter c_op a; \
raw_spin_unlock_irqrestore(lock, flags); \
} \
-EXPORT_SYMBOL(atomic64_##op);
+EXPORT_SYMBOL(generic_atomic64_##op);
#define ATOMIC64_OP_RETURN(op, c_op) \
-s64 atomic64_##op##_return(s64 a, atomic64_t *v) \
+s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
@@ -90,10 +90,10 @@ s64 atomic64_##op##_return(s64 a, atomic64_t *v) \
raw_spin_unlock_irqrestore(lock, flags); \
return val; \
} \
-EXPORT_SYMBOL(atomic64_##op##_return);
+EXPORT_SYMBOL(generic_atomic64_##op##_return);
#define ATOMIC64_FETCH_OP(op, c_op) \
-s64 atomic64_fetch_##op(s64 a, atomic64_t *v) \
+s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
@@ -105,7 +105,7 @@ s64 atomic64_fetch_##op(s64 a, atomic64_t *v) \
raw_spin_unlock_irqrestore(lock, flags); \
return val; \
} \
-EXPORT_SYMBOL(atomic64_fetch_##op);
+EXPORT_SYMBOL(generic_atomic64_fetch_##op);
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
@@ -130,7 +130,7 @@ ATOMIC64_OPS(xor, ^=)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
-s64 atomic64_dec_if_positive(atomic64_t *v)
+s64 generic_atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -143,9 +143,9 @@ s64 atomic64_dec_if_positive(atomic64_t *v)
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
-EXPORT_SYMBOL(atomic64_dec_if_positive);
+EXPORT_SYMBOL(generic_atomic64_dec_if_positive);
-s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
+s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -158,9 +158,9 @@ s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
-EXPORT_SYMBOL(atomic64_cmpxchg);
+EXPORT_SYMBOL(generic_atomic64_cmpxchg);
-s64 atomic64_xchg(atomic64_t *v, s64 new)
+s64 generic_atomic64_xchg(atomic64_t *v, s64 new)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -172,9 +172,9 @@ s64 atomic64_xchg(atomic64_t *v, s64 new)
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
-EXPORT_SYMBOL(atomic64_xchg);
+EXPORT_SYMBOL(generic_atomic64_xchg);
-s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
+s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@@ -188,4 +188,4 @@ s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
return val;
}
-EXPORT_SYMBOL(atomic64_fetch_add_unless);
+EXPORT_SYMBOL(generic_atomic64_fetch_add_unless);
--
2.11.0
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