[PATCH 5/7] checkpatch: warn if <asm/export.h> is included

[Masahiro Yamada <masahiroy@kernel.org>]

With the previous refactoring,

 - <asm/export.h> is a wrapper of <asm-generic/export.h>
 - <asm-generic/export.h> is a wrapper of <linux/export.h>

My hope is to replace

   #include <asm/export.h>  -->  #include <linux/export.h>

for all *.S files.

For now, adding a warning in the checkpatch.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 503e8abbb2c1..f824d690a565 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3753,6 +3753,13 @@ sub process {
 			     "Avoid using '.L' prefixed local symbol names for denoting a range of code via 'SYM_*_START/END' annotations; see Documentation/asm-annotations.rst\n" . $herecurr);
 		}
 
+# warn if <asm/export.h> is included.
+# <asm/export.h> is a wrapper of <linux/export.h>. Please include <linux/export.h> directly.
+		if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/export\.h\>}) {
+			WARN("INCLUDE_LINUX_EXPORT",
+			    "Please include <linux/export.h> instead of <asm/export.h>\n" . $herecurr);
+		}
+
 # check we are in a valid source file C or perl if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
 
-- 
2.32.0