linux-kernel - Re: [PATCH] watchdog: indydog: Add dependency on SGI_HAS

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Date:   Tue, 14 Nov 2017 14:48:12 +0100
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     James Hogan <james.hogan@...s.com>
Cc:     Matt Redfearn <matt.redfearn@...s.com>,
        Guenter Roeck <linux@...ck-us.net>, linux-mips@...ux-mips.org,
        "# 4 . 11 +" <stable@...r.kernel.org>,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH] watchdog: indydog: Add dependency on SGI_HAS_INDYDOG

On Tue, Nov 14, 2017 at 11:17:38AM +0000, James Hogan wrote:

> On Tue, Nov 14, 2017 at 10:52:54AM +0000, Matt Redfearn wrote:
> > Commit da2a68b3eb47 ("watchdog: Enable COMPILE_TEST where possible")
> > enabled building the Indy watchdog driver when COMPILE_TEST is enabled.
> > However, the driver makes reference to symbols that are only defined for
> > certain platforms are selected in the config. These platforms select
> > SGI_HAS_INDYDOG. Without this, link time errors result, for example
> > when building a MIPS allyesconfig.
> > 
> > drivers/watchdog/indydog.o: In function `indydog_write':
> > indydog.c:(.text+0x18): undefined reference to `sgimc'
> > indydog.c:(.text+0x1c): undefined reference to `sgimc'
> > drivers/watchdog/indydog.o: In function `indydog_start':
> > indydog.c:(.text+0x54): undefined reference to `sgimc'
> > indydog.c:(.text+0x58): undefined reference to `sgimc'
> > drivers/watchdog/indydog.o: In function `indydog_stop':
> > indydog.c:(.text+0xa4): undefined reference to `sgimc'
> > drivers/watchdog/indydog.o:indydog.c:(.text+0xa8): more undefined
> > references to `sgimc' follow
> > make: *** [Makefile:1005: vmlinux] Error 1
> > 
> > Fix this by ensuring that CONFIG_INDIDOG can only be selected when the
> > necessary dependent platform symbols are built in.
> > 
> > Fixes: da2a68b3eb47 ("watchdog: Enable COMPILE_TEST where possible")
> > Signed-off-by: Matt Redfearn <matt.redfearn@...s.com>
> > Cc: <stable@...r.kernel.org> # 4.11 +
> > ---
> > 
> >  drivers/watchdog/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index ca200d1f310a..d96e2e7544fc 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -1451,7 +1451,7 @@ config RC32434_WDT
> >  
> >  config INDYDOG
> >  	tristate "Indy/I2 Hardware Watchdog"
> > -	depends on SGI_HAS_INDYDOG || (MIPS && COMPILE_TEST)
> > +	depends on SGI_HAS_INDYDOG || (MIPS && COMPILE_TEST && SGI_HAS_INDYDOG)
> 
> (MIPS && COMPILE_TEST && SGI_HAS_INDYDOG) implies SGI_HAS_INDYDOG
> 
> So I think you can just do:
> -	depends on SGI_HAS_INDYDOG || (MIPS && COMPILE_TEST)
> +	depends on SGI_HAS_INDYDOG
> 
> I.e. COMPILE_TEST isn't of any value in this case.

I agree, due to the references to sgimc this driver will only compile for
the platforms which set SGI_HAS_INDYDOG; MIPS as the dependency is too
generic.

Updated patch for the watchdog maintainers' ease below.

  Ralf

Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Reported-by: Matt Redfearn <matt.redfearn@...s.com>
Suggested-by: James Hogan <james.hogan@...s.com>

 drivers/watchdog/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index c722cbfdc7e6..3ece1335ba84 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1451,7 +1451,7 @@ config RC32434_WDT
 
 config INDYDOG
 	tristate "Indy/I2 Hardware Watchdog"
-	depends on SGI_HAS_INDYDOG || (MIPS && COMPILE_TEST)
+	depends on SGI_HAS_INDYDOG
 	help
 	  Hardware driver for the Indy's/I2's watchdog. This is a
 	  watchdog timer that will reboot the machine after a 60 second