kernel/module: add documentation for try_module_get()
There is quite a bit of tribal knowledge around proper use of
try_module_get() and that it must be used only in a context which
can ensure the module won't be gone during the operation. Document
this little bit of tribal knowledge.
I'm extending this tribal knowledge with new developments which it
seems some folks do not yet believe to be true: we can be sure a
module will exist during the lifetime of a sysfs file operation.
For proof, refer to test_sysfs test #32:
./tools/testing/selftests/sysfs/sysfs.sh -t 0032
Without this being true, the write would fail or worse,
a crash would happen, in this test. It does not.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
1 file changed
