checkpatch: mark kunmap() and kunmap_atomic() deprecated

It was suggested by Fabio that kunmap() be marked deprecated in
checkpatch.[1] This did not seem necessary until an invalid conversion of
kmap_local_page() appeared in mainline.[2][3] The introduction of this bug
would have been flagged with kunmap() being marked deprecated.

Add kunmap() and kunmap_atomic() to checkpatch to help prevent further
confusion.

[1] https://lore.kernel.org/all/1884934.6tgchFWduM@suse/
[2] d406d26745ab ("cifs: skip alloc when request has no pages")
[3] https://lore.kernel.org/r/20221229-cifs-kmap-v1-1-c70d0e9a53eb@intel.com

Link: https://lkml.kernel.org/r/20221229-kmap-checkpatch-v2-1-919fc4d4e3c2@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Suggested-by: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 78cc595b98ce1c93d3c9f4f0ab105de1371972a6..a6d6d7e1d0cf1927b0bd31e2dcfb6baa19051b07 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -823,7 +823,9 @@ our %deprecated_apis = (
        "get_state_synchronize_sched"           => "get_state_synchronize_rcu",
        "cond_synchronize_sched"                => "cond_synchronize_rcu",
        "kmap"                                  => "kmap_local_page",
+       "kunmap"                                => "kunmap_local",
        "kmap_atomic"                           => "kmap_local_page",
+       "kunmap_atomic"                         => "kunmap_local",
 );
 
 #Create a search pattern for all these strings to speed up a loop below