linux-kernel - Re: [PATCH] ARM:mm: define arch-specific IOREMAP_MAX

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Date:	Wed, 9 Sep 2015 09:22:46 +0800
From:	Zhang Zhen <zhenzhang.zhang@...wei.com>
To:	Sergey Dyasly <dserrg@...il.com>
CC:	<linux@....linux.org.uk>, <nico@...aro.org>, <ssantosh@...nel.org>,
	<vitalya@...com>, <treding@...dia.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	"Nicolas Pitre" <nicolas.pitre@...aro.org>,
	James Bottomley <JBottomley@...allels.com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Vladimir Murzin <murzinv@...il.com>
Subject: Re: [PATCH] ARM:mm: define arch-specific IOREMAP_MAX_ORDER only in
 !SMP && !LPAE case

On 2015/9/9 2:12, Sergey Dyasly wrote:
> On 08.09.2015 5:45, Zhang Zhen wrote:
>> The arch-specific IOREMAP_MAX_ORDER is introduced in
>> commit: ff0daca([ARM] Add section support to ioremap) and
>> commit: a069c89 ([ARM] 3705/1: add supersection support to ioremap()).
>> But supersections and sections mappings are only used in !SMP && !LPAE case.
>> Otherwise, mapping is created using the usual 4K pages.
>>
>> In most cases without !SMP && !LPAE, the big alignment cause high fragmentation
>> issue in vmalloc area.
>> Here we use arch-specific IOREMAP_MAX_ORDER only in !SMP && !LPAE case,
>> otherwise use generic IOREMAP_MAX_ORDER in include/linux/vmalloc.h.
>>
>> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
>> ---
>>   arch/arm/include/asm/memory.h | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
>> index b7f6fb4..3209012 100644
>> --- a/arch/arm/include/asm/memory.h
>> +++ b/arch/arm/include/asm/memory.h
>> @@ -76,10 +76,12 @@
>>    */
>>   #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
>>
>> +#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
>>   /*
>>    * Allow 16MB-aligned ioremap pages
>>    */
>>   #define IOREMAP_MAX_ORDER    24
>> +#endif
>>
>>   #else /* CONFIG_MMU */
>>
> 
> Hmm... This looks exactly like my old patch -
> http://thread.gmane.org/gmane.linux.kernel.mm/127620
> (Thanks to Vladimir for pointing that out!)
> 
> Hasn't there been any progress about this issue?
> 
Oh sorry i didn't notice your old patch.
I send this patch because we encountered high fragmentation issue in vmalloc area
and the link about this issue.
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/313040.html
Let's drop my patch.

Besides, i just want to know why this patch is not included into the upstream kernel?

Thanks!
> .
> 


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