lib/test_sort.c: add module unload support

Web:        https://git.kernel.org/torvalds/c/92fc7cb8ae4d021cf7740e4ad0ced9fa9e07dae0
Commit:     92fc7cb8ae4d021cf7740e4ad0ced9fa9e07dae0
Parent:     d3deafaa8b5c14cd1a001d0be675fc1e242dce42
Refname:    refs/heads/master
Author:     Pravin Shedge <[email protected]>
AuthorDate: Tue Feb 6 15:38:42 2018 -0800
Committer:  Linus Torvalds <[email protected]>
CommitDate: Tue Feb 6 18:32:45 2018 -0800

    lib/test_sort.c: add module unload support
    
    test_sort.c performs array-based and linked list sort test.  Code allows
    to compile either as a loadable modules or builtin into the kernel.
    
    Current code is not allow to unload the test_sort.ko module after
    successful completion.
    
    This patch adds support to unload the "test_sort.ko" module by adding
    module_exit support.
    
    Previous patch was implemented auto unload support by returning -EAGAIN
    from module_init() function on successful case, but this approach is not
    ideal.
    
    The auto-unload might seem like a nice optimization, but it encourages
    inconsistent behaviour.  And behaviour that is different from all other
    normal modules.
    
    Link: http://lkml.kernel.org/r/[email protected]
    Signed-off-by: Pravin Shedge <[email protected]>
    Cc: Kostenzer Felix <[email protected]>
    Cc: Andy Shevchenko <[email protected]>
    Cc: Geert Uytterhoeven <[email protected]>
    Cc: Paul Gortmaker <[email protected]>
    Signed-off-by: Andrew Morton <[email protected]>
    Signed-off-by: Linus Torvalds <[email protected]>
---
 lib/test_sort.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/test_sort.c b/lib/test_sort.c
index d389c1cc2f6c..385c0ed5202f 100644
--- a/lib/test_sort.c
+++ b/lib/test_sort.c
@@ -39,5 +39,11 @@ exit:
 	return err;
 }
 
+static void __exit test_sort_exit(void)
+{
+}
+
 module_init(test_sort_init);
+module_exit(test_sort_exit);
+
 MODULE_LICENSE("GPL");
--
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