summaryrefslogblamecommitdiff
path: root/Documentation/atomic_bitops.txt
blob: 093cdaefdb3733ecd076b5ffbfe3ad880b2c3afd (plain) (tree) 
49618364689c ^



706eeb3e9c6f ^

























































61e02392d3c7 ^






706eeb3e9c6f ^





1
2
3

4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

61
62
63
64
65
66

67
68
69
70
71



             
























































                                                                              





                                                                                




                                                                       
=============
Atomic bitops
=============

While our bitmap_{}() functions are non-atomic, we have a number of operations
operating on single bits in a bitmap that are atomic.


API
---

The single bit operations are:

Non-RMW ops:

  test_bit()

RMW atomic operations without return value:

  {set,clear,change}_bit()
  clear_bit_unlock()

RMW atomic operations with return value:

  test_and_{set,clear,change}_bit()
  test_and_set_bit_lock()

Barriers:

  smp_mb__{before,after}_atomic()


All RMW atomic operations have a '__' prefixed variant which is non-atomic.


SEMANTICS
---------

Non-atomic ops:

In particular __clear_bit_unlock() suffers the same issue as atomic_set(),
which is why the generic version maps to clear_bit_unlock(), see atomic_t.txt.


RMW ops:

The test_and_{}_bit() operations return the original value of the bit.


ORDERING
--------

Like with atomic_t, the rule of thumb is:

 - non-RMW operations are unordered;

 - RMW operations that have no return value are unordered;

 - RMW operations that have a return value are fully ordered.

 - RMW operations that are conditional are unordered on FAILURE,
   otherwise the above rules apply. In the case of test_and_{}_bit() operations,
   if the bit in memory is unchanged by the operation then it is deemed to have
   failed.

Except for a successful test_and_set_bit_lock() which has ACQUIRE semantics and
clear_bit_unlock() which has RELEASE semantics.

Since a platform only has a single means of achieving atomic operations
the same barriers as for atomic_t are used, see atomic_t.txt.