[PATCH] scripts: kernel-doc: Ignore __alloc_size() attribute

[Kees Cook <keescook@xxxxxxxxxxxx>]

Fixes "Compiler Attributes: add __alloc_size() for better bounds checking"
so that the __alloc_size() macro is ignored for function prototypes when
generating kerndoc. Avoids warnings like:

./include/linux/slab.h:662: warning: Function parameter or member '1' not described in '__alloc_size'
./include/linux/slab.h:662: warning: Function parameter or member '2' not described in '__alloc_size'
./include/linux/slab.h:662: warning: expecting prototype for kcalloc().  Prototype was for __alloc_size() instead

Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 scripts/kernel-doc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index cfcb60737957..c123bac28f7a 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1789,6 +1789,7 @@ sub dump_function($$) {
     $prototype =~ s/__weak +//;
     $prototype =~ s/__sched +//;
     $prototype =~ s/__printf\s*\(\s*\d*\s*,\s*\d*\s*\) +//;
+    $prototype =~ s/__alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\) +//;
     my $define = $prototype =~ s/^#\s*define\s+//; #ak added
     $prototype =~ s/__attribute_const__ +//;
     $prototype =~ s/__attribute__\s*\(\(
-- 
2.30.2