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Subject: Re: [PATCH] powerpc/sysdev: fix compile errors
To:     =?UTF-8?B?546L5paH6JmO?= <wenhu.wang@vivo.com>,
        Andrew Donnellan <ajd@linux.ibm.com>
Cc:     Kate Stewart <kstewart@linuxfoundation.org>,
        Richard Fontana <rfontana@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, wangwenhu <wenhu.pku@gmail.com>,
        Paul Mackerras <paulus@samba.org>, trivial@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        linuxppc-dev@lists.ozlabs.org, lonehugo@hotmail.com
References: <ANcAOwAACK7otVnG7VF8E4rQ.3.1579589949706.Hmail.wenhu.wang@vivo.com>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <d3b340dc-54df-24f6-2831-50456beea7ab@c-s.fr>
Date:   Tue, 21 Jan 2020 09:37:07 +0100
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Le 21/01/2020 à 07:59, 王文虎 a écrit :
> 发件人：Andrew Donnellan <ajd@linux.ibm.com>
> 发送日期：2020-01-21 14:13:07
> 收件人：wangwenhu <wenhu.pku@gmail.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>,Richard Fontana <rfontana@redhat.com>,Thomas Gleixner <tglx@linutronix.de>,linuxppc-dev@lists.ozlabs.org,linux-kernel@vger.kernel.org
> 抄送人：trivial@kernel.org,lonehugo@hotmail.com,wenhu.wang@vivo.com
> 主题：Re: [PATCH] powerpc/sysdev: fix compile errors>On 21/1/20 4:31 pm, wangwenhu wrote:
>>> From: wangwenhu <wenhu.wang@vivo.com>
>>>
>>> Include arch/powerpc/include/asm/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
>>>
>>> Signed-off-by: wangwenhu <wenhu.wang@vivo.com>
>>
>> How long has this code been broken for?
> 
> It's been broken almost 15 months since the commit below:
> "commit aa91796ec46339f2ed53da311bd3ea77a3e4dfe1
> Author: Christophe Leroy <christophe.leroy@c-s.fr>
> Date:   Tue Oct 9 13:51:41 2018 +0000
> 
>      powerpc: don't use ioremap_prot() nor __ioremap() unless really needed."
> 
> And we are working on it now for further development.

That's pretty surprising. That commit didn't change the iounmap(). It 
only replaced ioremap_prot() by ioremap_coherent(). Both are defined in io.h

Christophe

> 
>>
>>> ---
>>>    arch/powerpc/sysdev/fsl_85xx_cache_sram.c | 1 +
>>>    1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/powerpc/sysdev/fsl_85xx_cache_sram.c b/arch/powerpc/sysdev/fsl_85xx_cache_sram.c
>>> index f6c665dac725..29b6868eff7d 100644
>>> --- a/arch/powerpc/sysdev/fsl_85xx_cache_sram.c
>>> +++ b/arch/powerpc/sysdev/fsl_85xx_cache_sram.c
>>> @@ -17,6 +17,7 @@
>>>    #include <linux/of_platform.h>
>>>    #include <asm/pgtable.h>
>>>    #include <asm/fsl_85xx_cache_sram.h>
>>> +#include <asm/io.h>
>>>
>>>    #include "fsl_85xx_cache_ctlr.h"
>>>
>>
>> -- 
>> Andrew Donnellan              OzLabs, ADL Canberra
>> ajd@linux.ibm.com             IBM Australia Limited
>>
> 
> Wenhu
>