linux-kernel - [PATCH] extable: Skip sorting if the table is empty

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Date:	Wed, 17 Jul 2013 09:55:11 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Ingo Molnar <mingo@...nel.org>,
	David Daney <david.daney@...ium.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Borislav Petkov <bp@...e.de>, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH] extable: Skip sorting if the table is empty

At least on ARM no-MMU the extable is empty and so there is nothing to
sort. So add a check for the table to be empty which effectively only
changes that the misleading pr_notice is suppressed.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
Hello,

I first tried to select BUILDTIME_EXTABLE_SORT for ARM no-MMU, too, but that
failed to build with

	no __ex_table in  file: vmlinux

. I didn't dig deeper for the reasons, but maybe this is worth fixing, too?

Best regards
Uwe

 kernel/extable.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 67460b9..832cb28 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -41,7 +41,7 @@ u32 __initdata main_extable_sort_needed = 1;
 /* Sort the kernel's built-in exception table */
 void __init sort_main_extable(void)
 {
-	if (main_extable_sort_needed) {
+	if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {
 		pr_notice("Sorting __ex_table...\n");
 		sort_extable(__start___ex_table, __stop___ex_table);
 	}
-- 
1.8.3.2

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