linux-kernel - [GIT pull] core/debugobjects for v5.15-rc1

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Date:   Mon, 30 Aug 2021 12:44:41 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] core/debugobjects for v5.15-rc1

Linus,

please pull the latest core/debugobjects branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-debugobjects-2021-08-30

up to:  4bedcc28469a: debugobjects: Make them PREEMPT_RT aware


A single commit for debugobjects to make them work on PREEMPT_RT by
preventing object pool refill in atomic contexts.


Thanks,

	tglx

------------------>
Thomas Gleixner (1):
      debugobjects: Make them PREEMPT_RT aware


 lib/debugobjects.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 9e14ae02306b..6946f8e204e3 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -557,7 +557,12 @@ __debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack
 	struct debug_obj *obj;
 	unsigned long flags;
 
-	fill_pool();
+	/*
+	 * On RT enabled kernels the pool refill must happen in preemptible
+	 * context:
+	 */
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible())
+		fill_pool();
 
 	db = get_bucket((unsigned long) addr);