Commit 5a9e3e15 authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Will Deacon

arm64: apply __ro_after_init to some objects

These objects are set during initialization, thereafter are read only.

Previously I only want to mark vdso_pages, vdso_spec, vectors_page and
cpu_ops as __read_mostly from performance point of view. Then inspired
by Kees's patch[1] to apply more __ro_after_init for arm, I think it's
better to mark them as __ro_after_init. What's more, I find some more
objects are also read only after init. So apply __ro_after_init to all
of them.

This patch also removes global vdso_pagelist and tries to clean up
vdso_spec[] assignment code.

[1] http://www.spinics.net/lists/arm-kernel/msg523188.htmlAcked-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarJisheng Zhang <jszhang@marvell.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent b6d081bd
......@@ -17,6 +17,7 @@
*/
#include <linux/acpi.h>
#include <linux/cache.h>
#include <linux/errno.h>
#include <linux/of.h>
#include <linux/string.h>
......@@ -28,7 +29,7 @@ extern const struct cpu_operations smp_spin_table_ops;
extern const struct cpu_operations acpi_parking_protocol_ops;
extern const struct cpu_operations cpu_psci_ops;
const struct cpu_operations *cpu_ops[NR_CPUS];
const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
static const struct cpu_operations *dt_supported_cpu_ops[] __initconst = {
&smp_spin_table_ops,
......
......@@ -6,6 +6,7 @@
* published by the Free Software Foundation.
*/
#include <linux/cache.h>
#include <linux/crc32.h>
#include <linux/init.h>
#include <linux/libfdt.h>
......@@ -20,7 +21,7 @@
#include <asm/pgtable.h>
#include <asm/sections.h>
u64 __read_mostly module_alloc_base;
u64 __ro_after_init module_alloc_base;
u16 __initdata memstart_offset_seed;
static __init u64 get_kaslr_seed(void *fdt)
......
......@@ -18,12 +18,13 @@
* Author: Will Deacon <will.deacon@arm.com>
*/
#include <linux/kernel.h>
#include <linux/cache.h>
#include <linux/clocksource.h>
#include <linux/elf.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/signal.h>
......@@ -37,8 +38,7 @@
#include <asm/vdso_datapage.h>
extern char vdso_start, vdso_end;
static unsigned long vdso_pages;
static struct page **vdso_pagelist;
static unsigned long vdso_pages __ro_after_init;
/*
* The vDSO data page.
......@@ -53,7 +53,7 @@ struct vdso_data *vdso_data = &vdso_data_store.data;
/*
* Create and map the vectors page for AArch32 tasks.
*/
static struct page *vectors_page[1];
static struct page *vectors_page[1] __ro_after_init;
static int __init alloc_vectors_page(void)
{
......@@ -110,11 +110,19 @@ int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp)
}
#endif /* CONFIG_COMPAT */
static struct vm_special_mapping vdso_spec[2];
static struct vm_special_mapping vdso_spec[2] __ro_after_init = {
{
.name = "[vvar]",
},
{
.name = "[vdso]",
},
};
static int __init vdso_init(void)
{
int i;
struct page **vdso_pagelist;
if (memcmp(&vdso_start, "\177ELF", 4)) {
pr_err("vDSO is not a valid ELF object!\n");
......@@ -138,16 +146,8 @@ static int __init vdso_init(void)
for (i = 0; i < vdso_pages; i++)
vdso_pagelist[i + 1] = pfn_to_page(PHYS_PFN(__pa(&vdso_start)) + i);
/* Populate the special mapping structures */
vdso_spec[0] = (struct vm_special_mapping) {
.name = "[vvar]",
.pages = vdso_pagelist,
};
vdso_spec[1] = (struct vm_special_mapping) {
.name = "[vdso]",
.pages = &vdso_pagelist[1],
};
vdso_spec[0].pages = &vdso_pagelist[0];
vdso_spec[1].pages = &vdso_pagelist[1];
return 0;
}
......
......@@ -20,6 +20,7 @@
#include <linux/gfp.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/cache.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/genalloc.h>
......@@ -30,7 +31,7 @@
#include <asm/cacheflush.h>
static int swiotlb __read_mostly;
static int swiotlb __ro_after_init;
static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot,
bool coherent)
......
......@@ -23,6 +23,7 @@
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/cache.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
......@@ -55,8 +56,8 @@
* executes, which assigns it its actual value. So use a default value
* that cannot be mistaken for a real physical address.
*/
s64 memstart_addr __read_mostly = -1;
phys_addr_t arm64_dma_phys_limit __read_mostly;
s64 memstart_addr __ro_after_init = -1;
phys_addr_t arm64_dma_phys_limit __ro_after_init;
#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
......
......@@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cache.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/errno.h>
......@@ -46,7 +47,7 @@
u64 idmap_t0sz = TCR_T0SZ(VA_BITS);
u64 kimage_voffset __read_mostly;
u64 kimage_voffset __ro_after_init;
EXPORT_SYMBOL(kimage_voffset);
/*
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment