Messages in this thread | | | Date | Wed, 9 Sep 2015 09:22:46 +0800 | From | Zhang Zhen <> | Subject | Re: [PATCH] ARM:mm: define arch-specific IOREMAP_MAX_ORDER only in !SMP && !LPAE case |
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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@huawei.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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