From: Qingfang DENG <qingfang.deng@siflower.com.cn>
Date: Fri, 3 Feb 2023 09:16:11 +0800
Subject: [PATCH] net: page_pool: use in_softirq() instead

We use BH context only for synchronization, so we don't care if it's
actually serving softirq or not.

As a side node, in case of threaded NAPI, in_serving_softirq() will
return false because it's in process context with BH off, making
page_pool_recycle_in_cache() unreachable.

Signed-off-by: Qingfang DENG <qingfang.deng@siflower.com.cn>
---

--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -295,7 +295,7 @@ static inline void page_pool_nid_changed
 static inline void page_pool_ring_lock(struct page_pool *pool)
 	__acquires(&pool->ring.producer_lock)
 {
-	if (in_serving_softirq())
+	if (in_softirq())
 		spin_lock(&pool->ring.producer_lock);
 	else
 		spin_lock_bh(&pool->ring.producer_lock);
@@ -304,7 +304,7 @@ static inline void page_pool_ring_lock(s
 static inline void page_pool_ring_unlock(struct page_pool *pool)
 	__releases(&pool->ring.producer_lock)
 {
-	if (in_serving_softirq())
+	if (in_softirq())
 		spin_unlock(&pool->ring.producer_lock);
 	else
 		spin_unlock_bh(&pool->ring.producer_lock);
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -338,8 +338,8 @@ static void page_pool_return_page(struct
 static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page)
 {
 	int ret;
-	/* BH protection not needed if current is serving softirq */
-	if (in_serving_softirq())
+	/* BH protection not needed if current is softirq */
+	if (in_softirq())
 		ret = ptr_ring_produce(&pool->ring, page);
 	else
 		ret = ptr_ring_produce_bh(&pool->ring, page);
@@ -397,7 +397,7 @@ __page_pool_put_page(struct page_pool *p
 			page_pool_dma_sync_for_device(pool, page,
 						      dma_sync_size);
 
-		if (allow_direct && in_serving_softirq() &&
+		if (allow_direct && in_softirq() &&
 		    page_pool_recycle_in_cache(page, pool))
 			return NULL;
 
