[3.11.y.z,extended,stable] Patch "powerpc/mpc512x: silence build warning upon disabled DIU" has been added to staging queue

Message ID 1386242834-4570-1-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques Dec. 5, 2013, 11:27 a.m.
This is a note to let you know that I have just added a patch titled

    powerpc/mpc512x: silence build warning upon disabled DIU

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see



From 8e508b8396b36a06acbba56dbdd586b6af0cc948 Mon Sep 17 00:00:00 2001
From: Gerhard Sittig <gsi@denx.de>
Date: Fri, 27 Sep 2013 17:28:38 +0200
Subject: powerpc/mpc512x: silence build warning upon disabled DIU

commit 45d20e8348969a165c53cfb91f445e7cc599a9f0 upstream.

a disabled Kconfig option results in a reference to a not implemented
routine when the IS_ENABLED() macro is used for both conditional
implementation of the routine as well as a C language source code test
at the call site -- the "if (0) func();" construct only gets eliminated
later by the optimizer, while the compiler already has emitted its
warning about "func()" being undeclared

provide an empty implementation for the mpc512x_setup_diu() and
mpc512x_init_diu() routines in case of the disabled option, to avoid the
compiler warning which is considered fatal and breaks compilation

the bug appeared with commit 2abbbb63c90ab55ca3f054772c2e5ba7df810c48
"powerpc/mpc512x: move common code to shared.c file", how to reproduce:

  make mpc512x_defconfig
  echo CONFIG_FB_FSL_DIU=n >> .config && make olddefconfig

    CC      arch/powerpc/platforms/512x/mpc512x_shared.o
  .../arch/powerpc/platforms/512x/mpc512x_shared.c: In function 'mpc512x_init_early':
  .../arch/powerpc/platforms/512x/mpc512x_shared.c:456:3: error: implicit declaration of function 'mpc512x_init_diu' [-Werror=implicit-function-declaration]
  .../arch/powerpc/platforms/512x/mpc512x_shared.c: In function 'mpc512x_setup_arch':
  .../arch/powerpc/platforms/512x/mpc512x_shared.c:469:3: error: implicit declaration of function 'mpc512x_setup_diu' [-Werror=implicit-function-declaration]
  cc1: all warnings being treated as errors
  make[4]: *** [arch/powerpc/platforms/512x/mpc512x_shared.o] Error 1

Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
 arch/powerpc/platforms/512x/mpc512x_shared.c | 3 +++
 1 file changed, 3 insertions(+)



diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
index a82a41b..1a7b1d0 100644
--- a/arch/powerpc/platforms/512x/mpc512x_shared.c
+++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
@@ -303,6 +303,9 @@  void __init mpc512x_setup_diu(void)
 	diu_ops.release_bootmem		= mpc512x_release_bootmem;

+void __init mpc512x_setup_diu(void) { /* EMPTY */ }
+void __init mpc512x_init_diu(void) { /* EMPTY */ }

 void __init mpc512x_init_IRQ(void)