linux-kernel - Re: kernel/module: Delete an error message for a failed memory allocation in add_module

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Date:   Thu, 19 Oct 2017 11:29:43 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     kernel-janitors@...r.kernel.org,
        Rusty Russell <rusty@...tcorp.com.au>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernel/module: Delete an error message for a failed memory
 allocation in add_module_usage()

+++ SF Markus Elfring [06/10/17 17:12 +0200]:
>From: Markus Elfring <elfring@...rs.sourceforge.net>
>Date: Fri, 6 Oct 2017 16:27:26 +0200
>
>Omit an extra message for a memory allocation failure in this function.
>
>This issue was detected by using the Coccinelle software.
>
>Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
>---
> kernel/module.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
>diff --git a/kernel/module.c b/kernel/module.c
>index de66ec825992..07ef44767245 100644
>--- a/kernel/module.c
>+++ b/kernel/module.c
>@@ -837,10 +837,8 @@ static int add_module_usage(struct module *a, struct module *b)
>
> 	pr_debug("Allocating new usage for %s.\n", a->name);
> 	use = kmalloc(sizeof(*use), GFP_ATOMIC);
>-	if (!use) {
>-		pr_warn("%s: out of memory loading\n", a->name);
>+	if (!use)
> 		return -ENOMEM;
>-	}

IMO this is removing useful information. Although stack traces are
generated on alloc failures, the extra print also tells us which
module we were trying to load at the time the memory allocation
failed.

Jessica