linux-kernel - Re: [PATCH] kernel/module: Reschedule while waiting for modules to finish loading

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Message-ID: <20190430075108.GA21092@linux-8ccs>
Date:   Tue, 30 Apr 2019 09:51:08 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/module: Reschedule while waiting for modules to
 finish loading

+++ Prarit Bhargava [29/04/19 11:17 -0400]:
>Heiko, do you want a Signed-off-by or a Reported-by?  Either one works
>for me.
>
>P.

I think you forgot to CC Heiko :)

>----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@...ibm.com>
>Fixes: linux-next commit f9a75c1d717f ("modules: Only return -EEXIST for modules that have finished loading")
>Signed-off-by: Prarit Bhargava <prarit@...hat.com>
>Cc: Jessica Yu <jeyu@...nel.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
>