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author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-10-19 12:05:22 -0700 |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-11-13 10:34:54 -0800 |
commit | 1f7870dd8729c64b8472b42440811e7ff94d16a4 (patch) | |
tree | ec1ab48f51ecb4846b380bf29b94e65b9e2138d4 /Documentation | |
parent | 8b19d1dead8413442ba0ff0b4e19b08f69d2f1b7 (diff) | |
download | linux-1f7870dd8729c64b8472b42440811e7ff94d16a4.tar.bz2 |
documentation: Add atomic_long_t to atomic_ops.txt
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/atomic_ops.txt | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index 68542fe13b85..183e41bdcb69 100644 --- a/Documentation/atomic_ops.txt +++ b/Documentation/atomic_ops.txt @@ -7,12 +7,13 @@ maintainers on how to implement atomic counter, bitops, and spinlock interfaces properly. - The atomic_t type should be defined as a signed integer. -Also, it should be made opaque such that any kind of cast to a normal -C integer type will fail. Something like the following should -suffice: + The atomic_t type should be defined as a signed integer and +the atomic_long_t type as a signed long integer. Also, they should +be made opaque such that any kind of cast to a normal C integer type +will fail. Something like the following should suffice: typedef struct { int counter; } atomic_t; + typedef struct { long counter; } atomic_long_t; Historically, counter has been declared volatile. This is now discouraged. See Documentation/volatile-considered-harmful.txt for the complete rationale. @@ -37,6 +38,9 @@ initializer is used before runtime. If the initializer is used at runtime, a proper implicit or explicit read memory barrier is needed before reading the value with atomic_read from another thread. +As with all of the atomic_ interfaces, replace the leading "atomic_" +with "atomic_long_" to operate on atomic_long_t. + The second interface can be used at runtime, as in: struct foo { atomic_t counter; }; |