linux-kernel - [PATCH v1 1/4] list: Introduce list

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Date:   Mon, 14 Nov 2022 13:28:39 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jakob Koschel <jakobkoschel@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Kevin Cernekee <cernekee@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v1 1/4] list: Introduce list_count() to count existing nodes

Some of the existing users, and definitely will be new ones, want to
count existing nodes in the list. Provide a generic API for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/list.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index 61762054b4be..098eccf8c1b6 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -655,6 +655,19 @@ static inline void list_splice_tail_init(struct list_head *list,
 	     !list_is_head(pos, (head)); \
 	     pos = n, n = pos->prev)
 
+/**
+ * list_count - count nodes in the list
+ * @head:	the head for your list.
+ */
+#define list_count(head)		\
+({					\
+	struct list_head *__tmp;	\
+	size_t __i = 0;			\
+	list_for_each(__tmp, head)	\
+		__i++;			\
+	__i;				\
+})
+
 /**
  * list_entry_is_head - test if the entry points to the head of the list
  * @pos:	the type * to cursor
-- 
2.35.1