linux-kernel - Re: [PATCH v2 24/25] arch: remove ioremap_wt, replace with arch

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Date:	Wed, 29 Jul 2015 15:21:56 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 24/25] arch: remove ioremap_wt, replace with arch_memremap

On Mon, Jul 27, 2015 at 1:03 AM, Christoph Hellwig <hch@....de> wrote:
>> +++ b/arch/frv/include/asm/io.h
>> @@ -17,8 +17,6 @@
>>
>>  #ifdef __KERNEL__
>>
>> -#define ARCH_HAS_IOREMAP_WT
>> -
>>  #include <linux/types.h>
>>  #include <asm/virtconvert.h>
>>  #include <asm/string.h>
>> @@ -267,20 +265,17 @@ static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned lon
>>       return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
>>  }
>>
>> -static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
>> -{
>> -     return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
>> -}
>> -
>> -static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
>> -{
>> -     return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
>> -}
>
>
>> +void *arch_memremap(resource_size_t offset, size_t size, unsigned long flags)
>> +{
>> +     return (void *) offset;
>> +}
>> +EXPORT_SYMBOL(arch_memremap);
>
> This doesn't look like a correct replacement.

It doesn't, but frv jumps through a lot of hoops to give the illusion
it actually supports different mapping types only to do this simple
case in the end.  Given we don't want fallback semantics I will simply
remove these false wrappers in the next revision of the patches.

> Also shouldn't the replacements of ioremap_fullcache or ioremap_wc be
> in the previous patch?
>
> A few more similar issues pop up for other architectures as well.

I went ahead and moved the deletion of ioremap_cached() and
ioremap_fullcache() to their own patches.
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