From: Jun Yao <yaojun8558363@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will.deacon@arm.com,
james.morse@arm.com, linux-kernel@vger.kernel.org
Subject: [RESEND PATCH v4 4/6] arm64/mm: Make swapper_pg_dir smaller
Date: Wed, 18 Jul 2018 18:17:25 +0800 [thread overview]
Message-ID: <20180718101727.10787-5-yaojun8558363@gmail.com> (raw)
In-Reply-To: <20180718101727.10787-1-yaojun8558363@gmail.com>
We setup final page tables in swapper_pg_dir, which just contains
PGD. And the PUD/PMD are allocated dynamically. So we can make it
smaller.
Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
---
arch/arm64/kernel/vmlinux.lds.S | 2 +-
arch/arm64/mm/mmu.c | 8 --------
2 files changed, 1 insertion(+), 9 deletions(-)
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 61d7cee3eaa6..2446911f4262 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -237,7 +237,7 @@ SECTIONS
. += RESERVED_TTBR0_SIZE;
#endif
swapper_pg_dir = .;
- . += SWAPPER_DIR_SIZE;
+ . += PAGE_SIZE;
swapper_pg_end = .;
__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 088a591e4ea4..1d16104aa0b9 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -633,14 +633,6 @@ void __init paging_init(void)
map_mem(swapper_pg_dir);
cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
init_mm.pgd = swapper_pg_dir;
-
- /*
- * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
- * allocated with it.
- */
- memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE,
- __pa_symbol(swapper_pg_end) - __pa_symbol(swapper_pg_dir)
- - PAGE_SIZE);
}
void __init set_init_mm_pgd(pgd_t *pgd)
--
2.17.1
next prev parent reply other threads:[~2018-07-18 10:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 10:17 [RESEND PATCH v4 0/6] arm64/mm: Move Jun Yao
2018-07-18 10:17 ` [RESEND PATCH v4 1/6] arm64/mm: Introduce init_pg_dir Jun Yao
2018-07-18 10:17 ` [RESEND PATCH v4 2/6] arm64/mm: Make __enable_mmu() take the Jun Yao
2018-07-18 10:17 ` [RESEND PATCH v4 3/6] arm64/mm: Create initial page tables in Jun Yao
2018-07-18 10:17 ` Jun Yao [this message]
2018-07-18 10:17 ` [RESEND PATCH v4 5/6] arm64/mm: Populate swapper_pg_dir by Jun Yao
2018-07-18 10:17 ` [RESEND PATCH v4 6/6] arm64/mm: Move Jun Yao
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