Subject: [PATCH net-next v2 1/6] net: page_pool: support error injection

From: Jakub Kicinski <[email-masked]>
Date: Mon, 29 Apr 2024 07:44:21 -0700

Because of caching / recycling using the general page allocation
failures to induce errors in page pool allocation is very hard.
Add direct error injection support to page_pool_alloc_pages().

Reviewed-by: Willem de Bruijn <[email-masked]>
Signed-off-by: Jakub Kicinski <[email-masked]>
---
CC: [email-masked]
CC: [email-masked]
---
 net/core/page_pool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 273c24429bce..8bcc7014a61a 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -5,6 +5,7 @@
  *	Copyright (C) 2016 Red Hat, Inc.
  */
 
+#include <linux/error-injection.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
@@ -550,6 +551,7 @@ struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp)
 	return page;
 }
 EXPORT_SYMBOL(page_pool_alloc_pages);
+ALLOW_ERROR_INJECTION(page_pool_alloc_pages, NULL);
 
 /* Calculate distance between two u32 values, valid if distance is below 2^(31)
  *  https://en.wikipedia.org/wiki/Serial_number_arithmetic#General_Solution
-- 
2.44.0