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From:   Wei Li <liwei213@huawei.com>
To:     <catalin.marinas@arm.com>, <rppt@linux.ibm.com>, <will@kernel.org>,
        <liwei213@huawei.com>
CC:     <fengbaopeng2@hisilicon.com>, <nsaenzjulienne@suse.de>,
        <steve.capper@arm.com>, <song.bao.hua@hisilicon.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <butao@hisilicon.com>
Subject: [PATCH] arm64: mm: decrease the section size to reduce the memory reserved for the page map
Date:   Fri, 4 Dec 2020 09:44:43 +0800
Message-ID: <20201204014443.43329-1-liwei213@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

For the memory hole, sparse memory model that define SPARSEMEM_VMEMMAP
do not free the reserved memory for the page map, decrease the section
size can reduce the waste of reserved memory.

Signed-off-by: Wei Li <liwei213@huawei.com>
Signed-off-by: Baopeng Feng <fengbaopeng2@hisilicon.com>
Signed-off-by: Xia Qing <saberlily.xia@hisilicon.com>
---
 arch/arm64/include/asm/sparsemem.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
index 1f43fcc79738..8963bd3def28 100644
--- a/arch/arm64/include/asm/sparsemem.h
+++ b/arch/arm64/include/asm/sparsemem.h
@@ -7,7 +7,7 @@

 #ifdef CONFIG_SPARSEMEM
 #define MAX_PHYSMEM_BITS	CONFIG_ARM64_PA_BITS
-#define SECTION_SIZE_BITS	30
+#define SECTION_SIZE_BITS	27
 #endif

 #endif
--
2.15.0