linux-kernel - [PATCH] x86/olpc: Fix build error with CONFIG_MFD

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Message-ID: <20181005131750.GA5366@zn.tnic>
Date:   Fri, 5 Oct 2018 15:17:51 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/olpc: Fix build error with CONFIG_MFD_CS5535=m

On Thu, Oct 04, 2018 at 06:08:08PM +0200, Lubomir Rintel wrote:
> On OLPC XO-1 we're discovering the RTC via device tree from the arch
> initcall. Don't let the PC platform register another one from its
> device initcall, it's not going to work:

Btw, a build fix ontop:

---
From: Borislav Petkov <bp@...e.de>
Date: Fri, 5 Oct 2018 15:13:07 +0200

When building a 32-bit config which has the above MFD item as module
but OLPC_XO1_PM is enabled =y - which is bool, btw - the kernel fails
building with:

  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_remove':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:159: undefined reference to `mfd_cell_disable'
  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_probe':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:133: undefined reference to `mfd_cell_enable'
  make: *** [Makefile:1030: vmlinux] Error 1

Force MFD_CS5535 to y if OLPC_XO1_PM is enabled.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Lubomir Rintel <lkundrak@...sk>
Cc: x86@...nel.org
---
 arch/x86/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1a0be022f91d..285b5d6a5ea5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2742,8 +2742,7 @@ config OLPC
 
 config OLPC_XO1_PM
 	bool "OLPC XO-1 Power Management"
-	depends on OLPC && MFD_CS5535 && PM_SLEEP
-	select MFD_CORE
+	depends on OLPC && MFD_CS5535=y && PM_SLEEP
 	---help---
 	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
 
-- 
2.19.0.271.gfe8321ec057f

-- 
Regards/Gruss,
    Boris.

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