linux-kernel - [PATCH 5/5] x86/pti: constify address parameters

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Date:   Mon, 16 Jul 2018 12:03:40 +0800
From:   Jiang Biao <jiang.biao2@....com.cn>
To:     tglx@...utronix.de, mingo@...hat.com
Cc:     dave.hansen@...ux.intel.com, luto@...nel.org, hpa@...or.com,
        x86@...nel.org, albcamus@...il.com, linux-kernel@...r.kernel.org,
        zhong.weidong@....com.cn, jiang.biao2@....com.cn
Subject: [PATCH 5/5] x86/pti: constify address parameters

Addresses passed in pti_user_pagetable_walk_*() are not supposed to
change at runtime, make them const to aviod future slipups.

Signed-off-by: Jiang Biao <jiang.biao2@....com.cn>
---
 arch/x86/mm/pti.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index a368656..ac2cbdd 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -164,7 +164,7 @@ pgd_t __pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd)
  *
  * Returns a pointer to a P4D on success, or NULL on failure.
  */
-static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
+static p4d_t *pti_user_pagetable_walk_p4d(const unsigned long address)
 {
 	pgd_t *pgd = kernel_to_user_pgdp(pgd_offset_k(address));
 	gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
@@ -192,7 +192,7 @@ static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
  *
  * Returns a pointer to a PMD on success, or NULL on failure.
  */
-static pmd_t *pti_user_pagetable_walk_pmd(unsigned long address)
+static pmd_t *pti_user_pagetable_walk_pmd(const unsigned long address)
 {
 	gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
 	pud_t *pud;
@@ -236,7 +236,7 @@ static pmd_t *pti_user_pagetable_walk_pmd(unsigned long address)
  *
  * Returns a pointer to a PTE on success, or NULL on failure.
  */
-static __init pte_t *pti_user_pagetable_walk_pte(unsigned long address)
+static __init pte_t *pti_user_pagetable_walk_pte(const unsigned long address)
 {
 	gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
 	pte_t *pte;
-- 
2.7.4