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authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-13 15:48:00 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-13 15:48:00 +0200
commitdbb885fecc1b1b35e93416bedd24d21bd20f60ed (patch)
tree9aa92bcc4e3d3594eba0ba85d72b878d85f35a59 /arch/m68k
parentd6dd50e07c5bec00db2005969b1a01f8ca3d25ef (diff)
parent2291059c852706c6f5ffb400366042b7625066cd (diff)
downloadlinux-dbb885fecc1b1b35e93416bedd24d21bd20f60ed.tar.bz2
Merge branch 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull arch atomic cleanups from Ingo Molnar: "This is a series kept separate from the main locking tree, which cleans up and improves various details in the atomics type handling: - Remove the unused atomic_or_long() method - Consolidate and compress atomic ops implementations between architectures, to reduce linecount and to make it easier to add new ops. - Rewrite generic atomic support to only require cmpxchg() from an architecture - generate all other methods from that" * 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() locking, mips: Fix atomics locking, sparc64: Fix atomics locking,arch: Rewrite generic atomic support locking,arch,xtensa: Fold atomic_ops locking,arch,sparc: Fold atomic_ops locking,arch,sh: Fold atomic_ops locking,arch,powerpc: Fold atomic_ops locking,arch,parisc: Fold atomic_ops locking,arch,mn10300: Fold atomic_ops locking,arch,mips: Fold atomic_ops locking,arch,metag: Fold atomic_ops locking,arch,m68k: Fold atomic_ops locking,arch,m32r: Fold atomic_ops locking,arch,ia64: Fold atomic_ops locking,arch,hexagon: Fold atomic_ops locking,arch,cris: Fold atomic_ops locking,arch,avr32: Fold atomic_ops locking,arch,arm64: Fold atomic_ops locking,arch,arm: Fold atomic_ops ...
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/include/asm/atomic.h111
1 files changed, 48 insertions, 63 deletions
diff --git a/arch/m68k/include/asm/atomic.h b/arch/m68k/include/asm/atomic.h
index 55695212a2ae..e85f047fb072 100644
--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -17,7 +17,7 @@
#define ATOMIC_INIT(i) { (i) }
-#define atomic_read(v) (*(volatile int *)&(v)->counter)
+#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
/*
@@ -30,16 +30,57 @@
#define ASM_DI "di"
#endif
-static inline void atomic_add(int i, atomic_t *v)
-{
- __asm__ __volatile__("addl %1,%0" : "+m" (*v) : ASM_DI (i));
+#define ATOMIC_OP(op, c_op, asm_op) \
+static inline void atomic_##op(int i, atomic_t *v) \
+{ \
+ __asm__ __volatile__(#asm_op "l %1,%0" : "+m" (*v) : ASM_DI (i));\
+} \
+
+#ifdef CONFIG_RMW_INSNS
+
+#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
+static inline int atomic_##op##_return(int i, atomic_t *v) \
+{ \
+ int t, tmp; \
+ \
+ __asm__ __volatile__( \
+ "1: movel %2,%1\n" \
+ " " #asm_op "l %3,%1\n" \
+ " casl %2,%1,%0\n" \
+ " jne 1b" \
+ : "+m" (*v), "=&d" (t), "=&d" (tmp) \
+ : "g" (i), "2" (atomic_read(v))); \
+ return t; \
}
-static inline void atomic_sub(int i, atomic_t *v)
-{
- __asm__ __volatile__("subl %1,%0" : "+m" (*v) : ASM_DI (i));
+#else
+
+#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
+static inline int atomic_##op##_return(int i, atomic_t * v) \
+{ \
+ unsigned long flags; \
+ int t; \
+ \
+ local_irq_save(flags); \
+ t = (v->counter c_op i); \
+ local_irq_restore(flags); \
+ \
+ return t; \
}
+#endif /* CONFIG_RMW_INSNS */
+
+#define ATOMIC_OPS(op, c_op, asm_op) \
+ ATOMIC_OP(op, c_op, asm_op) \
+ ATOMIC_OP_RETURN(op, c_op, asm_op)
+
+ATOMIC_OPS(add, +=, add)
+ATOMIC_OPS(sub, -=, sub)
+
+#undef ATOMIC_OPS
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
static inline void atomic_inc(atomic_t *v)
{
__asm__ __volatile__("addql #1,%0" : "+m" (*v));
@@ -76,67 +117,11 @@ static inline int atomic_inc_and_test(atomic_t *v)
#ifdef CONFIG_RMW_INSNS
-static inline int atomic_add_return(int i, atomic_t *v)
-{
- int t, tmp;
-
- __asm__ __volatile__(
- "1: movel %2,%1\n"
- " addl %3,%1\n"
- " casl %2,%1,%0\n"
- " jne 1b"
- : "+m" (*v), "=&d" (t), "=&d" (tmp)
- : "g" (i), "2" (atomic_read(v)));
- return t;
-}
-
-static inline int atomic_sub_return(int i, atomic_t *v)
-{
- int t, tmp;
-
- __asm__ __volatile__(
- "1: movel %2,%1\n"
- " subl %3,%1\n"
- " casl %2,%1,%0\n"
- " jne 1b"
- : "+m" (*v), "=&d" (t), "=&d" (tmp)
- : "g" (i), "2" (atomic_read(v)));
- return t;
-}
-
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
#else /* !CONFIG_RMW_INSNS */
-static inline int atomic_add_return(int i, atomic_t * v)
-{
- unsigned long flags;
- int t;
-
- local_irq_save(flags);
- t = atomic_read(v);
- t += i;
- atomic_set(v, t);
- local_irq_restore(flags);
-
- return t;
-}
-
-static inline int atomic_sub_return(int i, atomic_t * v)
-{
- unsigned long flags;
- int t;
-
- local_irq_save(flags);
- t = atomic_read(v);
- t -= i;
- atomic_set(v, t);
- local_irq_restore(flags);
-
- return t;
-}
-
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
unsigned long flags;