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From:   Prarit Bhargava <prarit@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Prarit Bhargava <prarit@redhat.com>, Jessica Yu <jeyu@kernel.org>
Subject: [PATCH] kernel/module: Reschedule while waiting for modules to finish loading
Date:   Mon, 29 Apr 2019 11:17:51 -0400
Message-Id: <20190429151751.15424-1-prarit@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Heiko, do you want a Signed-off-by or a Reported-by?  Either one works
for me.

P.

----8<----

On a s390 z14 LAR with 2 cpus about stalls about 3% of the time while
loading the s390_trng.ko module.

Add a reschedule point to the loop that waits for modules to complete
loading.

Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Fixes: linux-next commit f9a75c1d717f ("modules: Only return -EEXIST for modules that have finished loading")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>
---
 kernel/module.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/module.c b/kernel/module.c
index 410eeb7e4f1d..48748cfec991 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3585,6 +3585,7 @@ static int add_unformed_module(struct module *mod)
 					       finished_loading(mod->name));
 			if (err)
 				goto out_unlocked;
+			cond_resched();
 			goto again;
 		}
 		err = -EEXIST;
-- 
2.18.1