linux-kernel - [for-next][PATCH 5/7] ftrace: Fix accounting bug with direct->count in register_ftrace

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Date:   Sun, 17 Nov 2019 17:13:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [for-next][PATCH 5/7] ftrace: Fix accounting bug with direct->count in
 register_ftrace_direct()

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

The direct->count wasn't being updated properly, where it only was updated
when the first entry was added, but should be updated every time.

Fixes: 013bf0da04748 ("ftrace: Add ftrace_find_direct_func()")
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/ftrace.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 834f3556ea1e..32e4e5ffdd97 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5093,8 +5093,7 @@ int register_ftrace_direct(unsigned long ip, unsigned long addr)
 			ftrace_direct_func_count--;
 		}
 	} else {
-		if (!direct->count)
-			direct->count++;
+		direct->count++;
 	}
  out_unlock:
 	mutex_unlock(&direct_mutex);
-- 
2.24.0