Messages in this thread Patch in this message | | | Date | Tue, 8 Sep 2015 10:45:38 +0800 | From | Zhang Zhen <> | Subject | [PATCH] ARM:mm: define arch-specific IOREMAP_MAX_ORDER only in !SMP && !LPAE case |
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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 */
-- 1.9.1
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