linux-kernel - [PATCH 4.14 004/100] bus: arm-cci: remove unnecessary unreachable()

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Date:   Thu, 29 Nov 2018 15:11:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Russell King <linux@....linux.org.uk>,
        Stefan Agner <stefan@...er.ch>,
        Nicolas Pitre <nico@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Olof Johansson <olof@...om.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH 4.14 004/100] bus: arm-cci: remove unnecessary unreachable()

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Stefan Agner <stefan@...er.ch>

(commit 10d8713429d345867fc8998d6193b233c0cab28c upstream)

Mixing asm and C code is not recommended in a naked function by
gcc and leads to an error when using clang:
  drivers/bus/arm-cci.c:2107:2: error: non-ASM statement in naked
  function is not supported
        unreachable();
        ^

While the function is marked __naked it actually properly return
in asm. There is no need for the unreachable() call.

GCC 7.2 generates identical object files before and after, other
than (for obvious reasons) the line numbers generated by
WANT_WARN_ON_SLOWPATH for all the WARN()s appearing later in the
file.

Suggested-by: Russell King <linux@....linux.org.uk>
Signed-off-by: Stefan Agner <stefan@...er.ch>
Acked-by: Nicolas Pitre <nico@...aro.org>
Reviewed-by: Robin Murphy <robin.murphy@....com>
Signed-off-by: Olof Johansson <olof@...om.net>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/bus/arm-cci.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -2103,8 +2103,6 @@ asmlinkage void __naked cci_enable_port_
 	[sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)),
 	[sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)),
 	[offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) );
-
-	unreachable();
 }
 
 /**