diff options
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/kernel-locking.tmpl | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl index ed64d220baf2..d7884b13fb11 100644 --- a/Documentation/DocBook/kernel-locking.tmpl +++ b/Documentation/DocBook/kernel-locking.tmpl | |||
| @@ -1916,9 +1916,12 @@ machines due to caching. | |||
| 1916 | <function>mutex_lock()</function> | 1916 | <function>mutex_lock()</function> |
| 1917 | </para> | 1917 | </para> |
| 1918 | <para> | 1918 | <para> |
| 1919 | There is a <function>mutex_trylock()</function> which can be | 1919 | There is a <function>mutex_trylock()</function> which does not |
| 1920 | used inside interrupt context, as it will not sleep. | 1920 | sleep. Still, it must not be used inside interrupt context since |
| 1921 | its implementation is not safe for that. | ||
| 1921 | <function>mutex_unlock()</function> will also never sleep. | 1922 | <function>mutex_unlock()</function> will also never sleep. |
| 1923 | It cannot be used in interrupt context either since a mutex | ||
| 1924 | must be released by the same task that acquired it. | ||
| 1922 | </para> | 1925 | </para> |
| 1923 | </listitem> | 1926 | </listitem> |
| 1924 | </itemizedlist> | 1927 | </itemizedlist> |