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Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull locking updates from Ingo Molnar:
 "The locking tree was busier in this cycle than the usual pattern - a
  couple of major projects happened to coincide.

  The main changes are:

   - implement the atomic_fetch_{add,sub,and,or,xor}() API natively
     across all SMP architectures (Peter Zijlstra)

   - add atomic_fetch_{inc/dec}() as well, using the generic primitives
     (Davidlohr Bueso)

   - optimize various aspects of rwsems (Jason Low, Davidlohr Bueso,
     Waiman Long)

   - optimize smp_cond_load_acquire() on arm64 and implement LSE based
     atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
     on arm64 (Will Deacon)

   - introduce smp_acquire__after_ctrl_dep() and fix various barrier
     mis-uses and bugs (Peter Zijlstra)

   - after discovering ancient spin_unlock_wait() barrier bugs in its
     implementation and usage, strengthen its semantics and update/fix
     usage sites (Peter Zijlstra)

   - optimize mutex_trylock() fastpath (Peter Zijlstra)

   - ... misc fixes and cleanups"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits)
  locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API
  locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire()
  locking/static_keys: Fix non static symbol Sparse warning
  locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec()
  locking/atomic, arch/tile: Fix tilepro build
  locking/atomic, arch/m68k: Remove comment
  locking/atomic, arch/arc: Fix build
  locking/Documentation: Clarify limited control-dependency scope
  locking/atomic, arch/rwsem: Employ atomic_long_fetch_add()
  locking/atomic, arch/qrwlock: Employ atomic_fetch_add_acquire()
  locking/atomic, arch/mips: Convert to _relaxed atomics
  locking/atomic, arch/alpha: Convert to _relaxed atomics
  locking/atomic: Remove the deprecated atomic_{set,clear}_mask() functions
  locking/atomic: Remove linux/atomic.h:atomic_fetch_or()
  locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
  locking/atomic: Fix atomic64_relaxed() bits
  locking/atomic, arch/xtensa: Implement atomic_fetch_{add,sub,and,or,xor}()
  locking/atomic, arch/x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
  locking/atomic, arch/tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
  locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
  ...
This commit is contained in:
Linus Torvalds
2016-07-25 12:41:29 -07:00
parent a2303849a6 f06628638c
commit c86ad14d30
108 changed files with 3341 additions and 1031 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
arch/avr32/include/asm/atomic.h
View File

@@ -41,21 +41,49 @@ static inline int __atomic_##op##_return(int i, atomic_t *v) \
return result; \
}
#define ATOMIC_FETCH_OP(op, asm_op, asm_con) \
static inline int __atomic_fetch_##op(int i, atomic_t *v) \
{ \
int result, val; \
\
asm volatile( \
"/* atomic_fetch_" #op " */\n" \
"1: ssrf 5\n" \
" ld.w %0, %3\n" \
" mov %1, %0\n" \
" " #asm_op " %1, %4\n" \
" stcond %2, %1\n" \
" brne 1b" \
: "=&r" (result), "=&r" (val), "=o" (v->counter) \
: "m" (v->counter), #asm_con (i) \
: "cc"); \
\
return result; \
}
ATOMIC_OP_RETURN(sub, sub, rKs21)
ATOMIC_OP_RETURN(add, add, r)
ATOMIC_FETCH_OP (sub, sub, rKs21)
ATOMIC_FETCH_OP (add, add, r)
#define ATOMIC_OP(op, asm_op) \
#define ATOMIC_OPS(op, asm_op) \
ATOMIC_OP_RETURN(op, asm_op, r) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
(void)__atomic_##op##_return(i, v); \
} \
ATOMIC_FETCH_OP(op, asm_op, r) \
static inline int atomic_fetch_##op(int i, atomic_t *v) \
{ \
return __atomic_fetch_##op(i, v); \
}
ATOMIC_OP(and, and)
ATOMIC_OP(or, or)
ATOMIC_OP(xor, eor)
ATOMIC_OPS(and, and)
ATOMIC_OPS(or, or)
ATOMIC_OPS(xor, eor)
#undef ATOMIC_OP
#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
/*
@@ -87,6 +115,14 @@ static inline int atomic_add_return(int i, atomic_t *v)
return __atomic_add_return(i, v);
}
static inline int atomic_fetch_add(int i, atomic_t *v)
{
if (IS_21BIT_CONST(i))
return __atomic_fetch_sub(-i, v);
return __atomic_fetch_add(i, v);
}
/*
* atomic_sub_return - subtract the atomic variable
* @i: integer value to subtract
@@ -102,6 +138,14 @@ static inline int atomic_sub_return(int i, atomic_t *v)
return __atomic_add_return(-i, v);
}
static inline int atomic_fetch_sub(int i, atomic_t *v)
{
if (IS_21BIT_CONST(i))
return __atomic_fetch_sub(i, v);
return __atomic_fetch_add(-i, v);
}
/*
* __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t