linux-kernel - Re: [PATCH 5/6] powerpc: Implement DISCONTIGMEM and allow selection on PPC32

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Date:   Wed, 21 Feb 2018 18:53:43 +0100
From:   christophe leroy <christophe.leroy@....fr>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     Kate Stewart <kstewart@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Paul Mackerras <paulus@...ba.org>, kbuild-all@...org,
        Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org, Joel Stanley <joel@....id.au>
Subject: Re: [PATCH 5/6] powerpc: Implement DISCONTIGMEM and allow selection
 on PPC32



Le 21/02/2018 à 17:08, Jonathan Neuschäfer a écrit :
> On Wed, Feb 21, 2018 at 07:46:28AM +0800, kbuild test robot wrote:
> [...]
>>>> include/linux/mmzone.h:1239:19: error: conflicting types for 'pfn_valid'
>>      static inline int pfn_valid(unsigned long pfn)
>>                        ^~~~~~~~~
>>     In file included from include/linux/mmzone.h:912:0,
>>                      from include/linux/gfp.h:6,
>>                      from include/linux/mm.h:10,
>>                      from include/linux/mman.h:5,
>>                      from arch/powerpc/kernel/asm-offsets.c:22:
>>     arch/powerpc/include/asm/mmzone.h:40:19: note: previous definition of 'pfn_valid' was here
>>      static inline int pfn_valid(int pfn)
>>                        ^~~~~~~~~
>>     make[2]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1
>>     make[2]: Target '__build' not remade because of errors.
>>     make[1]: *** [prepare0] Error 2
>>     make[1]: Target 'prepare' not remade because of errors.
>>     make: *** [sub-make] Error 2
> 
> Oops, I'll fix this in the next version (and compile-test on ppc64...).
> 
> Weirdly enough, x86-32 and parisc define pfn_valid with an int
> parameter, too (both of them since the Beginning Of Time, aka.
> v2.6.12-rc2).
> 

Behind the fact that the pfn type is different, my understanding is that 
you have to define CONFIG_HAVE_ARCH_PFN_VALID in the Kconfig in order to 
avoid it being included in include/linux/mmzone.h

Christophe

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