[patch] checkpatch: add warning of future __GFP_NOFAIL use

[David Rientjes]

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@xxxxxxxxxx>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9c98100..6667689 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4114,6 +4114,12 @@ 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",
--
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