linux-kernel - [PATCH] [v2] debugobjects: fix debug_objects

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Date:   Thu, 22 Feb 2018 16:52:58 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Waiman Long <longman@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] debugobjects: fix debug_objects_freed accounting

The removal of the batched object freeing has caused the debug_objects_freed
to become read-only, and the reading is inside an ifdef, so gcc warns that it
is completely unused without CONFIG_DEBUG_FS:

lib/debugobjects.c:71:14: error: 'debug_objects_freed' defined but not used [-Werror=unused-variable]

Assuming we are still interested in this number, this adds back code to
keep track of the freed objects.

Fixes: 636e1970fd7d ("debugobjects: Use global free list in free_object()")
Suggested-by: Waiman Long <longman@...hat.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
--
v2: simplify the counting as pointed out by Longman
---
 lib/debugobjects.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index faab2c4ea024..105ecfc47d8c 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -233,6 +233,7 @@ static void free_obj_work(struct work_struct *work)
 	 */
 	if (obj_nr_tofree) {
 		hlist_move_list(&obj_to_free, &tofree);
+		debug_objects_freed += obj_nr_tofree;
 		obj_nr_tofree = 0;
 	}
 	raw_spin_unlock_irqrestore(&pool_lock, flags);
-- 
2.9.0