linux-kernel - [PATCH RFC 2/5] extable: Skip sorting if sorted at build time.

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Message-Id: <1321645068-20475-3-git-send-email-ddaney.cavm@gmail.com>
Date:	Fri, 18 Nov 2011 11:37:45 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-embedded@...r.kernel.org, x86@...nel.org
Cc:	David Daney <david.daney@...ium.com>
Subject: [PATCH RFC 2/5] extable: Skip sorting if sorted at build time.

From: David Daney <david.daney@...ium.com>

If the build program sortextable has already sorted the exception
table, don't sort it again.

Signed-off-by: David Daney <david.daney@...ium.com>
---
 kernel/extable.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 5339705..fe35a63 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -35,10 +35,16 @@ DEFINE_MUTEX(text_mutex);
 extern struct exception_table_entry __start___ex_table[];
 extern struct exception_table_entry __stop___ex_table[];
 
+/* Cleared by build time tools if the table is already sorted. */
+u32 __initdata main_extable_sort_needed = 1;
+
 /* Sort the kernel's built-in exception table */
 void __init sort_main_extable(void)
 {
-	sort_extable(__start___ex_table, __stop___ex_table);
+	if (main_extable_sort_needed)
+		sort_extable(__start___ex_table, __stop___ex_table);
+	else
+		pr_notice("__ex_table already sorted, skipping sort\n");
 }
 
 /* Given an address, look for it in the exception tables. */
-- 
1.7.2.3

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