linux-kernel - [PATCH] include/linux/mm: fix release_pages

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Message-Id: <20230106203331.127532-1-sj@kernel.org>
Date:   Fri,  6 Jan 2023 20:33:31 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, corbet@....net,
        linux-doc@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH] include/linux/mm: fix release_pages_arg kernel doc comment

Commit 449c796768c9 ("mm: teach release_pages() to take an array of
encoded page pointers too") added the kernel doc comment for
release_pages() on top of 'union release_pages_arg', so making 'make
htmldocs' complains as below:

    ./include/linux/mm.h:1268: warning: cannot understand function prototype: 'typedef union '

The kernel doc comment for the function is already on top of the
function's definition in mm/swap.c, and the new comment is actually not
for the function but indeed release_pages_arg.  Fixing the comment to
reflect the intent would be one option.  But, kernel doc cannot parse
the union as below due to the attribute.

    ./include/linux/mm.h:1272: error: Cannot parse struct or union!

Modify the comment to reflect the intent but do not mark it as a kernel
doc comment.

Fixes: 449c796768c9 ("mm: teach release_pages() to take an array of encoded page pointers too")
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/mm.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a2bf261cdbef..3df8815f6d51 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1297,10 +1297,10 @@ static inline void folio_put_refs(struct folio *folio, int refs)
 		__folio_put(folio);
 }
 
-/**
- * release_pages - release an array of pages or folios
+/*
+ * union release_pages_arg - an array of pages or folios
  *
- * This just releases a simple array of multiple pages, and
+ * release_pages() releases a simple array of multiple pages, and
  * accepts various different forms of said page array: either
  * a regular old boring array of pages, an array of folios, or
  * an array of encoded page pointers.
-- 
2.25.1