[PATCH 4/5] x86/mm: Convert some slow-path static_cpu_has() callers to boot_cpu_has()

Borislav Petkov
2019-03-30T11:20:50Z

From: Borislav Petkov <bp@suse.de>

Using static_cpu_has() is pointless on those paths, convert them to the
boot_cpu_has() variant.

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
---
arch/x86/mm/dump_pagetables.c | 4 ++--
arch/x86/mm/pgtable.c | 4 ++--
arch/x86/mm/pti.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index ee8f8ab46941..7b71ac15b235 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -577,7 +577,7 @@ void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
{
#ifdef CONFIG_PAGE_TABLE_ISOLATION
- if (user && static_cpu_has(X86_FEATURE_PTI))
+ if (user && boot_cpu_has(X86_FEATURE_PTI))
pgd = kernel_to_user_pgdp(pgd);
#endif
ptdump_walk_pgd_level_core(m, pgd, false, false);
@@ -590,7 +590,7 @@ void ptdump_walk_user_pgd_level_checkwx(void)
pgd_t *pgd = INIT_PGD;

if (!(__supported_pte_mask & _PAGE_NX) ||
- !static_cpu_has(X86_FEATURE_PTI))
+ !boot_cpu_has(X86_FEATURE_PTI))
return;

pr_info("x86/mm: Checking user space page tables\n");
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 7bd01709a091..3dbf440d4114 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -190,7 +190,7 @@ static void pgd_dtor(pgd_t *pgd)
* when PTI is enabled. We need them to map the per-process LDT into the
* user-space page-table.
*/
-#define PREALLOCATED_USER_PMDS (static_cpu_has(X86_FEATURE_PTI) ? \
+#define PREALLOCATED_USER_PMDS (boot_cpu_has(X86_FEATURE_PTI) ? \
KERNEL_PGD_PTRS : 0)
#define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS

@@ -292,7 +292,7 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)

#ifdef CONFIG_PAGE_TABLE_ISOLATION

- if (!static_cpu_has(X86_FEATURE_PTI))
+ if (!boot_cpu_has(X86_FEATURE_PTI))
return;

pgdp = kernel_to_user_pgdp(pgdp);
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 139b28a01ce4..5d27172c683f 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -626,7 +626,7 @@ static void pti_set_kernel_image_nonglobal(void)
*/
void __init pti_init(void)
{
- if (!static_cpu_has(X86_FEATURE_PTI))
+ if (!boot_cpu_has(X86_FEATURE_PTI))
return;

pr_info("enabled\n");
--
2.21.0