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ARM: 8597/1: VDSO: put RO and RO after init objects into proper sections 

vdso_data_mapping is never modified, so mark it as const.

vdso_total_pages, vdso_data_page, vdso_text_mapping and cntvct_ok are
initialized by vdso_init(), thereafter are read only.

The fact that they are read only after init makes them candidates for
__ro_after_init declarations.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jisheng Zhang 2016-08-15 09:20:21 +01:00 committed by Russell King
parent bcd3006f07
commit 92bb8d5d55
1 changed files with 6 additions and 5 deletions
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11
arch/arm/kernel/vdso.c
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@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cache.h>
#include <linux/elf.h>
#include <linux/err.h>
#include <linux/kernel.h>
@ -39,7 +40,7 @@
static struct page **vdso_text_pagelist;
/* Total number of pages needed for the data and text portions of the VDSO. */
unsigned int vdso_total_pages __read_mostly;
unsigned int vdso_total_pages __ro_after_init;
/*
* The VDSO data page.
@ -47,13 +48,13 @@ unsigned int vdso_total_pages __read_mostly;
static union vdso_data_store vdso_data_store __page_aligned_data;
static struct vdso_data *vdso_data = &vdso_data_store.data;
static struct page *vdso_data_page;
static struct vm_special_mapping vdso_data_mapping = {
static struct page *vdso_data_page __ro_after_init;
static const struct vm_special_mapping vdso_data_mapping = {
.name = "[vvar]",
.pages = &vdso_data_page,
};
static struct vm_special_mapping vdso_text_mapping = {
static struct vm_special_mapping vdso_text_mapping __ro_after_init = {
.name = "[vdso]",
};
@ -67,7 +68,7 @@ struct elfinfo {
/* Cached result of boot-time check for whether the arch timer exists,
* and if so, whether the virtual counter is useable.
*/
static bool cntvct_ok __read_mostly;
static bool cntvct_ok __ro_after_init;
static bool __init cntvct_functional(void)
{