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Subject: Re: [PATCH] powerpc/sysdev: fix compile errors
To:     Jiri Kosina <jikos@kernel.org>,
        Christophe Leroy <christophe.leroy@c-s.fr>
Cc:     WANG Wenhu <wenhu.wang@vivo.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Allison Randal <allison@lohutok.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        wenhu.pku@gmail.com
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 <nycvar.YFH.7.76.2005181228480.25812@cbobk.fhfr.pm>
 <nycvar.YFH.7.76.2005181232140.25812@cbobk.fhfr.pm>
From:   Christophe Leroy <christophe.leroy@csgroup.eu>
Message-ID: <494faa28-e994-14e9-71da-07f5214b4579@csgroup.eu>
Date:   Mon, 18 May 2020 12:36:36 +0200
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Le 18/05/2020 à 12:32, Jiri Kosina a écrit :
> On Mon, 18 May 2020, Jiri Kosina wrote:
> 
>>>> Include linux/io.h into fsl_85xx_cache_sram.c to fix the
>>>> implicit-declaration compile errors when building Cache-Sram.
>>>>
>>>> arch/powerpc/sysdev/fsl_85xx_cache_sram.c: In function
>>>> ‘instantiate_cache_sram’:
>>>> arch/powerpc/sysdev/fsl_85xx_cache_sram.c:97:26: error: implicit declaration
>>>> of function ‘ioremap_coherent’; did you mean ‘bitmap_complement’?
>>>> [-Werror=implicit-function-declaration]
>>>>     cache_sram->base_virt = ioremap_coherent(cache_sram->base_phys,
>>>>                             ^~~~~~~~~~~~~~~~
>>>>                             bitmap_complement
>>>> arch/powerpc/sysdev/fsl_85xx_cache_sram.c:97:24: error: assignment makes
>>>> pointer from integer without a cast [-Werror=int-conversion]
>>>>     cache_sram->base_virt = ioremap_coherent(cache_sram->base_phys,
>>>>                           ^
>>>> arch/powerpc/sysdev/fsl_85xx_cache_sram.c:123:2: error: implicit declaration
>>>> of function ‘iounmap’; did you mean ‘roundup’?
>>>> [-Werror=implicit-function-declaration]
>>>>     iounmap(cache_sram->base_virt);
>>>>     ^~~~~~~
>>>>     roundup
>>>> cc1: all warnings being treated as errors
>>>>
>>>> Fixed: commit 6db92cc9d07d ("powerpc/85xx: add cache-sram support")
>>>> Signed-off-by: WANG Wenhu <wenhu.wang@vivo.com>
>>>
>>> Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
>>
>> As this doesn't seem to have been picked up for linux-next yet, I am
>> picking it up now.
> 
> Only now I've noticed that this is actually a dead code o_O as this file
> can't be built by any combination of config options. So I am dropping the
> patch again, but why do we keep it in the tree in the first place?
> 

There is a series aiming at making use of it, see 
https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=172421

Christophe