Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-25 21:51:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

locking,arch,arc: Fold atomic_ops

Browse Source 
Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20140508135851.886055622@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2014-03-23 16:29:31 +01:00 committed by Ingo Molnar
parent b93c7b8c5b
commit f7d11e93ee
1 changed files with 65 additions and 123 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

188
arch/arc/include/asm/atomic.h
View File

@ -25,79 +25,36 @@
#define atomic_set(v, i) (((v)->counter) = (i))
static inline void atomic_add(int i, atomic_t *v)
{
unsigned int temp;
#define ATOMIC_OP(op, c_op, asm_op) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
unsigned int temp; \
\
__asm__ __volatile__( \
"1: llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \
: "=&r"(temp) /* Early clobber, to prevent reg reuse */ \
: "r"(&v->counter), "ir"(i) \
: "cc"); \
} \
__asm__ __volatile__(
"1: llock %0, [%1] \n"
" add %0, %0, %2 \n"
" scond %0, [%1] \n"
" bnz 1b \n"
: "=&r"(temp) /* Early clobber, to prevent reg reuse */
: "r"(&v->counter), "ir"(i)
: "cc");
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned int temp;
__asm__ __volatile__(
"1: llock %0, [%1] \n"
" sub %0, %0, %2 \n"
" scond %0, [%1] \n"
" bnz 1b \n"
: "=&r"(temp)
: "r"(&v->counter), "ir"(i)
: "cc");
}
/* add and also return the new value */
static inline int atomic_add_return(int i, atomic_t *v)
{
unsigned int temp;
__asm__ __volatile__(
"1: llock %0, [%1] \n"
" add %0, %0, %2 \n"
" scond %0, [%1] \n"
" bnz 1b \n"
: "=&r"(temp)
: "r"(&v->counter), "ir"(i)
: "cc");
return temp;
}
static inline int atomic_sub_return(int i, atomic_t *v)
{
unsigned int temp;
__asm__ __volatile__(
"1: llock %0, [%1] \n"
" sub %0, %0, %2 \n"
" scond %0, [%1] \n"
" bnz 1b \n"
: "=&r"(temp)
: "r"(&v->counter), "ir"(i)
: "cc");
return temp;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
unsigned int temp;
__asm__ __volatile__(
"1: llock %0, [%1] \n"
" bic %0, %0, %2 \n"
" scond %0, [%1] \n"
" bnz 1b \n"
: "=&r"(temp)
: "r"(addr), "ir"(mask)
: "cc");
#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
static inline int atomic_##op##_return(int i, atomic_t *v) \
{ \
unsigned int temp; \
\
__asm__ __volatile__( \
"1: llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \
: "=&r"(temp) \
: "r"(&v->counter), "ir"(i) \
: "cc"); \
\
return temp; \
}
#else /* !CONFIG_ARC_HAS_LLSC */
@ -126,6 +83,7 @@ static inline void atomic_set(atomic_t *v, int i)
v->counter = i;
atomic_ops_unlock(flags);
}
#endif
/*
@ -133,63 +91,47 @@ static inline void atomic_set(atomic_t *v, int i)
* Locking would change to irq-disabling only (UP) and spinlocks (SMP)
*/
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long flags;
atomic_ops_lock(flags);
v->counter += i;
atomic_ops_unlock(flags);
#define ATOMIC_OP(op, c_op, asm_op) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
unsigned long flags; \
\
atomic_ops_lock(flags); \
v->counter c_op i; \
atomic_ops_unlock(flags); \
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned long flags;
atomic_ops_lock(flags);
v->counter -= i;
atomic_ops_unlock(flags);
}
static inline int atomic_add_return(int i, atomic_t *v)
{
unsigned long flags;
unsigned long temp;
atomic_ops_lock(flags);
temp = v->counter;
temp += i;
v->counter = temp;
atomic_ops_unlock(flags);
return temp;
}
static inline int atomic_sub_return(int i, atomic_t *v)
{
unsigned long flags;
unsigned long temp;
atomic_ops_lock(flags);
temp = v->counter;
temp -= i;
v->counter = temp;
atomic_ops_unlock(flags);
return temp;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
unsigned long flags;
atomic_ops_lock(flags);
*addr &= ~mask;
atomic_ops_unlock(flags);
#define ATOMIC_OP_RETURN(op, c_op) \
static inline int atomic_##op##_return(int i, atomic_t *v) \
{ \
unsigned long flags; \
unsigned long temp; \
\
atomic_ops_lock(flags); \
temp = v->counter; \
temp c_op i; \
v->counter = temp; \
atomic_ops_unlock(flags); \
\
return temp; \
}
#endif /* !CONFIG_ARC_HAS_LLSC */
#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)
ATOMIC_OP(and, &=, and)
#define atomic_clear_mask(mask, v) atomic_and(~(mask), (v))
#undef ATOMIC_OPS
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
/**
* __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t