linux-kernel - [tip: locking/core] locking/rtmutex: Inline chainwalk depth check

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Date:   Mon, 29 Mar 2021 16:24:10 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/rtmutex: Inline chainwalk depth check

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     f7efc4799f8114ba85b68584f83293f435009de4
Gitweb:        https://git.kernel.org/tip/f7efc4799f8114ba85b68584f83293f435009de4
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Fri, 26 Mar 2021 16:29:36 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 29 Mar 2021 15:57:03 +02:00

locking/rtmutex: Inline chainwalk depth check

There is no point for this wrapper at all.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20210326153943.754254046@linutronix.de
---
 kernel/locking/rtmutex.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 8a934db..2c77e72 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -343,14 +343,9 @@ static void rt_mutex_adjust_prio(struct task_struct *p)
 static bool rt_mutex_cond_detect_deadlock(struct rt_mutex_waiter *waiter,
 					  enum rtmutex_chainwalk chwalk)
 {
-	/*
-	 * This is just a wrapper function for the following call,
-	 * because debug_rt_mutex_detect_deadlock() smells like a magic
-	 * debug feature and I wanted to keep the cond function in the
-	 * main source file along with the comments instead of having
-	 * two of the same in the headers.
-	 */
-	return debug_rt_mutex_detect_deadlock(waiter, chwalk);
+	if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEX))
+		return waiter != NULL;
+	return chwalk == RT_MUTEX_FULL_CHAINWALK;
 }
 
 /*