scripts/kernel-doc: support EXPORT_SYMBOL_NS_GPL() with -export

Parse EXPORT_SYMBOL_NS_GPL() in addition to EXPORT_SYMBOL_GPL() for use
with the -export flag.

Link: https://lore.kernel.org/r/4-v6-a196d26f289e+11787-iommufd_jgg@nvidia.comAcked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

scripts/kernel-doc

@@ -256,6 +256,7 @@ my $doc_inline_sect = '\s*\*\s*(@\s*[\w][\w\.]*\s*):(.*)';
 my $doc_inline_end = '^\s*\*/\s*$';
 my $doc_inline_oneline = '^\s*/\*\*\s*(@[\w\s]+):\s*(.*)\s*\*/\s*$';
 my $export_symbol = '^\s*EXPORT_SYMBOL(_GPL)?\s*\(\s*(\w+)\s*\)\s*;';
+my $export_symbol_ns = '^\s*EXPORT_SYMBOL_NS(_GPL)?\s*\(\s*(\w+)\s*,\s*\w+\)\s*;';
 my $function_pointer = qr{([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)};
 my $attribute = qr{__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)}i;
 
@@ -1948,6 +1949,10 @@ sub process_export_file($) {
 	    next if (defined($nosymbol_table{$2}));
 	    $function_table{$2} = 1;
 	}
+	if (/$export_symbol_ns/) {
+	    next if (defined($nosymbol_table{$2}));
+	    $function_table{$2} = 1;
+	}
     }
 
     close(IN);
@@ -2419,12 +2424,12 @@ found on PATH.
 =item -export
 
 Only output documentation for the symbols that have been exported using
-EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL() in any input FILE or -export-file FILE.
+EXPORT_SYMBOL() and related macros in any input FILE or -export-file FILE.
 
 =item -internal
 
 Only output documentation for the symbols that have NOT been exported using
-EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL() in any input FILE or -export-file FILE.
+EXPORT_SYMBOL() and related macros in any input FILE or -export-file FILE.
 
 =item -function NAME
 
@@ -2451,8 +2456,7 @@ Do not output DOC: sections.
 
 =item -export-file FILE
 
-Specify an additional FILE in which to look for EXPORT_SYMBOL() and
-EXPORT_SYMBOL_GPL().
+Specify an additional FILE in which to look for EXPORT_SYMBOL information.
 
 To be used with -export or -internal.