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powerpc/mpc512x: silence build warning upon disabled DIU

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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 2abbbb63c9
"powerpc/mpc512x: move common code to shared.c file", how to reproduce:

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

    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>
CC: <stable@vger.kernel.org> # v3.11
Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Gerhard Sittig 2013-09-27 17:28:38 +02:00 committed by Anatolij Gustschin
parent 50bd6153d1
commit 45d20e8348
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/platforms/512x/mpc512x_shared.c
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@ -303,6 +303,9 @@ void __init mpc512x_setup_diu(void)
diu_ops.release_bootmem = mpc512x_release_bootmem;
}
#else
void __init mpc512x_setup_diu(void) { /* EMPTY */ }
void __init mpc512x_init_diu(void) { /* EMPTY */ }
#endif
void __init mpc512x_init_IRQ(void)