checkpatch: add warning of future __GFP_NOFAIL use

gfp.h and page_alloc.c already specify that __GFP_NOFAIL is deprecated and
no new users should be added.

Add a warning to checkpatch to catch this.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 8efce59..9bb4a42 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4113,6 +4113,12 @@ sub process {
                             "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
                }
 
+# check for GFP_NOWAIT use
+               if ($line =~ /\b__GFP_NOFAIL\b/) {
+                       WARN("__GFP_NOFAIL",
+                            "Use of __GFP_NOFAIL is deprecated, no new users should be added\n" . $herecurr);
+               }
+
 # check for multiple semicolons
                if ($line =~ /;\s*;\s*$/) {
                        if (WARN("ONE_SEMICOLON",