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Date: Tue, 5 Apr 2016 16:22:51 +0800 From: Chen Feng <puck.chen@...ilicon.com> To: <catalin.marinas@....com>, <will.deacon@....com>, <ard.biesheuvel@...aro.org>, <mark.rutland@....com>, <akpm@...ux-foundation.org>, <robin.murphy@....com>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <mhocko@...e.com>, <kirill.shutemov@...ux.intel.com>, <rientjes@...gle.com>, <linux-mm@...ck.org> CC: <puck.chen@...ilicon.com>, <puck.chen@...mail.com>, <oliver.fu@...ilicon.com>, <linuxarm@...wei.com>, <dan.zhao@...ilicon.com>, <suzhuangluan@...ilicon.com>, <yudongbin@...licon.com>, <albert.lubing@...ilicon.com>, <xuyiping@...ilicon.com>, <saberlily.xia@...ilicon.com> Subject: [PATCH 1/2] arm64: mem-model: add flatmem model for arm64 We can reduce the memory allocated at mem-map by flatmem. currently, the default memory-model in arm64 is sparse memory. The mem-map array is not freed in this scene. If the physical address is too long, it will reserved too much memory for the mem-map array. Signed-off-by: Chen Feng <puck.chen@...ilicon.com> Signed-off-by: Fu Jun <oliver.fu@...ilicon.com> --- arch/arm64/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4f43622..c18930d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -559,6 +559,9 @@ config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_VMEMMAP_ENABLE +config ARCH_FLATMEM_ENABLE + def_bool y + config ARCH_SPARSEMEM_DEFAULT def_bool ARCH_SPARSEMEM_ENABLE -- 1.9.1
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