| commit | 0b2806768899dba5967bcd4a3b93eaed9a1dc4f3 | |
| author | Jonathan Corbet <corbet@lwn.net> | |
| Sun, 18 May 2008 20:27:41 +0000 (18 14:27 -0600) | ||
| committer | Jonathan Corbet <corbet@lwn.net> | |
| Fri, 20 Jun 2008 20:05:53 +0000 (20 14:05 -0600) | ||
| tree | c9e7762d9b236883f4a23a170919317a6e7c93c7 | treesnapshot (tar.gz zip) |
| parent | 6606470dd1d628878383c96d10b52a77986ddac7 | commitdiff |
Add cycle_kernel_lock()
A number of driver functions are so obviously trivial that they do not need
the big kernel lock - at least not overtly. It turns out that the
acquisition of the BKL in driver open() functions can perform a sort of
poor-hacker's serialization function, delaying the open operation until the
driver is certain to have completed its initialization. Add a simple
cycle_kernel_lock() function for these cases to make it clear that there is
no need to *hold* the BKL, just to be sure that we can acquire it.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
A number of driver functions are so obviously trivial that they do not need
the big kernel lock - at least not overtly. It turns out that the
acquisition of the BKL in driver open() functions can perform a sort of
poor-hacker's serialization function, delaying the open operation until the
driver is certain to have completed its initialization. Add a simple
cycle_kernel_lock() function for these cases to make it clear that there is
no need to *hold* the BKL, just to be sure that we can acquire it.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| include/linux/smp_lock.h | diffblobblamehistory |