netdev - [PATCH net-next v9 3/4] skbuff: Add a function to check if a page belongs to page

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Date: Tue, 12 Dec 2023 12:46:13 +0800
From: Liang Chen <liangchen.linux@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com
Cc: netdev@...r.kernel.org,
	linux-mm@...ck.org,
	jasowang@...hat.com,
	almasrymina@...gle.com,
	liangchen.linux@...il.com
Subject: [PATCH net-next v9 3/4] skbuff: Add a function to check if a page belongs to page_pool

Wrap code for checking if a page is a page_pool page into a
function for better readability and ease of reuse.

Signed-off-by: Liang Chen <liangchen.linux@...il.com>
Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
---
 net/core/skbuff.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b157efea5dea..7e26b56cda38 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -890,6 +890,11 @@ static void skb_clone_fraglist(struct sk_buff *skb)
 		skb_get(list);
 }
 
+static bool is_pp_page(struct page *page)
+{
+	return (page->pp_magic & ~0x3UL) == PP_SIGNATURE;
+}
+
 #if IS_ENABLED(CONFIG_PAGE_POOL)
 bool napi_pp_put_page(struct page *page, bool napi_safe)
 {
@@ -905,7 +910,7 @@ bool napi_pp_put_page(struct page *page, bool napi_safe)
 	 * and page_is_pfmemalloc() is checked in __page_pool_put_page()
 	 * to avoid recycling the pfmemalloc page.
 	 */
-	if (unlikely((page->pp_magic & ~0x3UL) != PP_SIGNATURE))
+	if (unlikely(!is_pp_page(page)))
 		return false;
 
 	pp = page->pp;
-- 
2.31.1