linux-kernel - [PATCH 3.16 275/294] ARM: 8160/1: drop warning about return

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Message-ID: <lsq.1510009382.242661537@decadent.org.uk>
Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Russell King" <rmk+kernel@....linux.org.uk>,
        "Uwe Kleine-König" 
        <u.kleine-koenig@...gutronix.de>, "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH 3.16 275/294] ARM: 8160/1: drop warning about
 return_address not using unwind tables

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

commit e16343c47e4276f5ebc77ca16feb5e50ca1918f9 upstream.

The warning was introduced in 2009 (commit 4bf1fa5a34aa ([ARM] 5613/1:
implement CALLER_ADDRESSx)). The only "problem" here is that
CALLER_ADDRESSx for x > 1 returns NULL which doesn't do much harm.

The drawback of implementing a fix (i.e. use unwind tables to implement CALLER_ADDRESSx) is that much of the unwinder code would need to be marked as not
traceable.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm/kernel/return_address.c | 4 ----
 1 file changed, 4 deletions(-)

--- a/arch/arm/kernel/return_address.c
+++ b/arch/arm/kernel/return_address.c
@@ -59,10 +59,6 @@ void *return_address(unsigned int level)
 
 #else /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) */
 
-#if defined(CONFIG_ARM_UNWIND)
-#warning "TODO: return_address should use unwind tables"
-#endif
-
 void *return_address(unsigned int level)
 {
 	return NULL;