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Subject[PATCH v1 5/6] powerpc/vdso: Declare constant vars as __ro_after_init
Date
To avoid any risk of modification of vital VDSO variables,
declare them __ro_after_init.

vdso32_kbase and vdso64_kbase could be made 'const', but it would
have high impact on all functions using them as the compiler doesn't
expect const property to be discarded.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/vdso.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 6390a37dacea..600df1164a0b 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -38,19 +38,19 @@
#define VDSO_ALIGNMENT (1 << 16)

extern char vdso32_start, vdso32_end;
-static unsigned int vdso32_pages;
-static void *vdso32_kbase = &vdso32_start;
-unsigned long vdso32_sigtramp;
-unsigned long vdso32_rt_sigtramp;
+static unsigned int vdso32_pages __ro_after_init;
+static void *vdso32_kbase __ro_after_init = &vdso32_start;
+unsigned long vdso32_sigtramp __ro_after_init;
+unsigned long vdso32_rt_sigtramp __ro_after_init;

extern char vdso64_start, vdso64_end;
-static void *vdso64_kbase = &vdso64_start;
-static unsigned int vdso64_pages;
+static void *vdso64_kbase __ro_after_init = &vdso64_start;
+static unsigned int vdso64_pages __ro_after_init;
#ifdef CONFIG_PPC64
-unsigned long vdso64_rt_sigtramp;
+unsigned long vdso64_rt_sigtramp __ro_after_init;
#endif /* CONFIG_PPC64 */

-static int vdso_ready;
+static int vdso_ready __ro_after_init;

/*
* The vdso data page (aka. systemcfg for old ppc64 fans) is here.
--
2.25.0
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