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: [PATCH v5 6/6] arm64/mm: Move {idmap_pg_dir .. swapper_pg_dir} to rodata section.
Date: Mon, 17 Sep 2018 12:43:33 +0800 [thread overview]
Message-ID: <20180917044333.30051-7-yaojun8558363@gmail.com> (raw)
In-Reply-To: <20180917044333.30051-1-yaojun8558363@gmail.com>
Move the idmap_pg_dir/tramp_pg_dir/reserved_ttbr0/swapper_pg_dir to
the rodata section. When the kernel is initialized, the
idmap_pg_dir, tramp_pg_dir and reserved_ttbr0 will not change. And
it's safe to move them to rodata section.
Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
---
arch/arm64/kernel/vmlinux.lds.S | 39 ++++++++++++++++++++-------------
1 file changed, 24 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index a634def77442..328925b308fc 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -64,8 +64,13 @@ jiffies = jiffies_64;
*(.entry.tramp.text) \
. = ALIGN(PAGE_SIZE); \
__entry_tramp_text_end = .;
+
+#define TRAMP_PG_TABLE \
+ tramp_pg_dir = .; \
+ . += PAGE_SIZE;
#else
#define TRAMP_TEXT
+#define TRAMP_PG_TABLE
#endif
#define INIT_PG_TABLES \
@@ -74,6 +79,24 @@ jiffies = jiffies_64;
. += SWAPPER_DIR_SIZE; \
init_pg_end = .;
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+#define RESERVED_PG_TABLE \
+ reserved_ttbr0 = .; \
+ . += RESERVED_TTBR0_SIZE;
+#else
+#define RESERVED_PG_TABLE
+#endif
+
+#define KERNEL_PG_TABLES \
+ . = ALIGN(PAGE_SIZE); \
+ idmap_pg_dir = .; \
+ . += IDMAP_DIR_SIZE; \
+ TRAMP_PG_TABLE \
+ RESERVED_PG_TABLE \
+ swapper_pg_dir = .; \
+ . += PAGE_SIZE; \
+ swapper_pg_end = .;
+
/*
* The size of the PE/COFF section that covers the kernel image, which
* runs from stext to _edata, must be a round multiple of the PE/COFF
@@ -143,6 +166,7 @@ SECTIONS
RO_DATA(PAGE_SIZE) /* everything from this point to */
EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */
NOTES
+ KERNEL_PG_TABLES
. = ALIGN(SEGMENT_ALIGN);
__init_begin = .;
@@ -224,21 +248,6 @@ SECTIONS
BSS_SECTION(0, 0, 0)
. = ALIGN(PAGE_SIZE);
- idmap_pg_dir = .;
- . += IDMAP_DIR_SIZE;
-
-#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
- tramp_pg_dir = .;
- . += PAGE_SIZE;
-#endif
-
-#ifdef CONFIG_ARM64_SW_TTBR0_PAN
- reserved_ttbr0 = .;
- . += RESERVED_TTBR0_SIZE;
-#endif
- swapper_pg_dir = .;
- . += PAGE_SIZE;
- swapper_pg_end = .;
__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
_end = .;
--
2.17.1
next prev parent reply other threads:[~2018-09-17 4:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-17 4:43 [PATCH v5 0/6] Move swapper_pg_dir to rodata section Jun Yao
2018-09-17 4:43 ` [PATCH v5 1/6] arm64/mm: Introduce the init_pg_dir Jun Yao
2018-09-24 13:01 ` Mark Rutland
2018-09-24 14:03 ` Mark Rutland
2018-09-17 4:43 ` [PATCH v5 2/6] arm64/mm: Pass ttbr1 as a parameter to __enable_mmu() Jun Yao
2018-09-24 13:26 ` Mark Rutland
2018-09-17 4:43 ` [PATCH v5 3/6] arm64/mm: Create the initial page table in the init_pg_dir Jun Yao
2018-09-24 13:34 ` Mark Rutland
2018-10-01 13:49 ` James Morse
2018-09-17 4:43 ` [PATCH v5 4/6] arm64/mm: Create the final page table directly in swapper_pg_dir Jun Yao
2018-09-17 4:43 ` [PATCH v5 5/6] arm64/mm: Populate the swapper_pg_dir by fixmap Jun Yao
2018-09-24 16:36 ` Mark Rutland
2018-10-01 10:41 ` James Morse
2018-10-01 13:49 ` James Morse
2018-09-24 16:54 ` Mark Rutland
2018-09-17 4:43 ` Jun Yao [this message]
2018-09-21 22:26 ` [PATCH v5 0/6] Move swapper_pg_dir to rodata section James Morse
2018-09-25 8:56 ` Jun Yao
2018-09-24 17:19 ` Mark Rutland
2018-09-25 9:53 ` Jun Yao
2018-09-25 14:06 ` Mark Rutland, catalin.marinas
2018-09-25 14:38 ` Catalin Marinas
2018-10-03 13:33 ` James Morse
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