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Subject[tip:x86/boot] x86/mm: Stop pretending pgtable_l5_enabled is a variable
Commit-ID:  ed7588d5dc6f5e7202fb9bbeb14d94706ba225d7
Gitweb: https://git.kernel.org/tip/ed7588d5dc6f5e7202fb9bbeb14d94706ba225d7
Author: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate: Fri, 18 May 2018 13:35:24 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 19 May 2018 11:56:57 +0200

x86/mm: Stop pretending pgtable_l5_enabled is a variable

pgtable_l5_enabled is defined using cpu_feature_enabled() but we refer
to it as a variable. This is misleading.

Make pgtable_l5_enabled() a function.

We cannot literally define it as a function due to circular dependencies
between header files. Function-alike macros is close enough.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180518103528.59260-4-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/page_64_types.h | 2 +-
arch/x86/include/asm/paravirt.h | 4 ++--
arch/x86/include/asm/pgalloc.h | 4 ++--
arch/x86/include/asm/pgtable.h | 10 +++++-----
arch/x86/include/asm/pgtable_32_types.h | 2 +-
arch/x86/include/asm/pgtable_64.h | 2 +-
arch/x86/include/asm/pgtable_64_types.h | 14 +++++++++-----
arch/x86/include/asm/sparsemem.h | 4 ++--
arch/x86/kernel/head64.c | 2 +-
arch/x86/kernel/machine_kexec_64.c | 3 ++-
arch/x86/mm/dump_pagetables.c | 6 +++---
arch/x86/mm/fault.c | 4 ++--
arch/x86/mm/ident_map.c | 2 +-
arch/x86/mm/init_64.c | 8 ++++----
arch/x86/mm/kasan_init_64.c | 8 ++++----
arch/x86/mm/kaslr.c | 8 ++++----
arch/x86/mm/tlb.c | 2 +-
arch/x86/platform/efi/efi_64.c | 2 +-
arch/x86/power/hibernate_64.c | 2 +-
19 files changed, 47 insertions(+), 42 deletions(-)

diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h
index 2c5a966dc222..6afac386a434 100644
--- a/arch/x86/include/asm/page_64_types.h
+++ b/arch/x86/include/asm/page_64_types.h
@@ -53,7 +53,7 @@
#define __PHYSICAL_MASK_SHIFT 52

#ifdef CONFIG_X86_5LEVEL
-#define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled ? 56 : 47)
+#define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47)
#else
#define __VIRTUAL_MASK_SHIFT 47
#endif
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 9be2bf13825b..d49bbf4bb5c8 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -574,14 +574,14 @@ static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
}

#define set_pgd(pgdp, pgdval) do { \
- if (pgtable_l5_enabled) \
+ if (pgtable_l5_enabled()) \
__set_pgd(pgdp, pgdval); \
else \
set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd }); \
} while (0)

#define pgd_clear(pgdp) do { \
- if (pgtable_l5_enabled) \
+ if (pgtable_l5_enabled()) \
set_pgd(pgdp, __pgd(0)); \
} while (0)

diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h
index 263c142a6a6c..ada6410fd2ec 100644
--- a/arch/x86/include/asm/pgalloc.h
+++ b/arch/x86/include/asm/pgalloc.h
@@ -167,7 +167,7 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
#if CONFIG_PGTABLE_LEVELS > 4
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return;
paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
@@ -193,7 +193,7 @@ extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long address)
{
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
___p4d_free_tlb(tlb, p4d);
}

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index f1633de5a675..5715647fc4fe 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -65,7 +65,7 @@ extern pmdval_t early_pmd_flags;

#ifndef __PAGETABLE_P4D_FOLDED
#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
-#define pgd_clear(pgd) (pgtable_l5_enabled ? native_pgd_clear(pgd) : 0)
+#define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
#endif

#ifndef set_p4d
@@ -881,7 +881,7 @@ static inline unsigned long p4d_index(unsigned long address)
#if CONFIG_PGTABLE_LEVELS > 4
static inline int pgd_present(pgd_t pgd)
{
- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return 1;
return pgd_flags(pgd) & _PAGE_PRESENT;
}
@@ -900,7 +900,7 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
/* to find an entry in a page-table-directory. */
static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return (p4d_t *)pgd;
return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
}
@@ -909,7 +909,7 @@ static inline int pgd_bad(pgd_t pgd)
{
unsigned long ignore_flags = _PAGE_USER;

- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return 0;

if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
@@ -920,7 +920,7 @@ static inline int pgd_bad(pgd_t pgd)

static inline int pgd_none(pgd_t pgd)
{
- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return 0;
/*
* There is no need to do a workaround for the KNL stray
diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
index e3225e83db7d..d9a001a4a872 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -15,7 +15,7 @@
# include <asm/pgtable-2level_types.h>
#endif

-#define pgtable_l5_enabled 0
+#define pgtable_l5_enabled() 0

#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 877bc27718ae..3c5385f9a88f 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -220,7 +220,7 @@ static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
{
pgd_t pgd;

- if (pgtable_l5_enabled || !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) {
+ if (pgtable_l5_enabled() || !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) {
*p4dp = p4d;
return;
}
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index c14a4116a693..054765ab2da2 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -28,12 +28,16 @@ extern unsigned int __pgtable_l5_enabled;
* cpu_feature_enabled() is not available in early boot code.
* Use variable instead.
*/
-#define pgtable_l5_enabled __pgtable_l5_enabled
+static inline bool pgtable_l5_enabled(void)
+{
+ return __pgtable_l5_enabled;
+}
#else
-#define pgtable_l5_enabled cpu_feature_enabled(X86_FEATURE_LA57)
+#define pgtable_l5_enabled() cpu_feature_enabled(X86_FEATURE_LA57)
#endif /* USE_EARLY_PGTABLE_L5 */
+
#else
-#define pgtable_l5_enabled 0
+#define pgtable_l5_enabled() 0
#endif /* CONFIG_X86_5LEVEL */

extern unsigned int pgdir_shift;
@@ -109,7 +113,7 @@ extern unsigned int ptrs_per_p4d;

#define LDT_PGD_ENTRY_L4 -3UL
#define LDT_PGD_ENTRY_L5 -112UL
-#define LDT_PGD_ENTRY (pgtable_l5_enabled ? LDT_PGD_ENTRY_L5 : LDT_PGD_ENTRY_L4)
+#define LDT_PGD_ENTRY (pgtable_l5_enabled() ? LDT_PGD_ENTRY_L5 : LDT_PGD_ENTRY_L4)
#define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT)

#define __VMALLOC_BASE_L4 0xffffc90000000000UL
@@ -123,7 +127,7 @@ extern unsigned int ptrs_per_p4d;

#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
# define VMALLOC_START vmalloc_base
-# define VMALLOC_SIZE_TB (pgtable_l5_enabled ? VMALLOC_SIZE_TB_L5 : VMALLOC_SIZE_TB_L4)
+# define VMALLOC_SIZE_TB (pgtable_l5_enabled() ? VMALLOC_SIZE_TB_L5 : VMALLOC_SIZE_TB_L4)
# define VMEMMAP_START vmemmap_base
#else
# define VMALLOC_START __VMALLOC_BASE_L4
diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h
index 4617a2bf123c..199218719a86 100644
--- a/arch/x86/include/asm/sparsemem.h
+++ b/arch/x86/include/asm/sparsemem.h
@@ -27,8 +27,8 @@
# endif
#else /* CONFIG_X86_32 */
# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
-# define MAX_PHYSADDR_BITS (pgtable_l5_enabled ? 52 : 44)
-# define MAX_PHYSMEM_BITS (pgtable_l5_enabled ? 52 : 46)
+# define MAX_PHYSADDR_BITS (pgtable_l5_enabled() ? 52 : 44)
+# define MAX_PHYSMEM_BITS (pgtable_l5_enabled() ? 52 : 46)
#endif

#endif /* CONFIG_SPARSEMEM */
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 494fea1dbd6e..8d372d1c266d 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -279,7 +279,7 @@ again:
* critical -- __PAGE_OFFSET would point us back into the dynamic
* range and we might end up looping forever...
*/
- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
p4d_p = pgd_p;
else if (pgd)
p4d_p = (p4dval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 6010449ca6d2..4c8acdfdc5a7 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -354,7 +354,8 @@ void arch_crash_save_vmcoreinfo(void)
{
VMCOREINFO_NUMBER(phys_base);
VMCOREINFO_SYMBOL(init_top_pgt);
- VMCOREINFO_NUMBER(pgtable_l5_enabled);
+ vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
+ pgtable_l5_enabled());

#ifdef CONFIG_NUMA
VMCOREINFO_SYMBOL(node_data);
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index cc7ff5957194..2f3c9196b834 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -360,7 +360,7 @@ static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
void *pt)
{
if (__pa(pt) == __pa(kasan_zero_pmd) ||
- (pgtable_l5_enabled && __pa(pt) == __pa(kasan_zero_p4d)) ||
+ (pgtable_l5_enabled() && __pa(pt) == __pa(kasan_zero_p4d)) ||
__pa(pt) == __pa(kasan_zero_pud)) {
pgprotval_t prot = pte_flags(kasan_zero_pte[0]);
note_page(m, st, __pgprot(prot), 0, 5);
@@ -476,8 +476,8 @@ static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
}
}

-#define pgd_large(a) (pgtable_l5_enabled ? pgd_large(a) : p4d_large(__p4d(pgd_val(a))))
-#define pgd_none(a) (pgtable_l5_enabled ? pgd_none(a) : p4d_none(__p4d(pgd_val(a))))
+#define pgd_large(a) (pgtable_l5_enabled() ? pgd_large(a) : p4d_large(__p4d(pgd_val(a))))
+#define pgd_none(a) (pgtable_l5_enabled() ? pgd_none(a) : p4d_none(__p4d(pgd_val(a))))

static inline bool is_hypervisor_range(int idx)
{
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 73bd8c95ac71..77ec014554e7 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -439,7 +439,7 @@ static noinline int vmalloc_fault(unsigned long address)
if (pgd_none(*pgd_k))
return -1;

- if (pgtable_l5_enabled) {
+ if (pgtable_l5_enabled()) {
if (pgd_none(*pgd)) {
set_pgd(pgd, *pgd_k);
arch_flush_lazy_mmu_mode();
@@ -454,7 +454,7 @@ static noinline int vmalloc_fault(unsigned long address)
if (p4d_none(*p4d_k))
return -1;

- if (p4d_none(*p4d) && !pgtable_l5_enabled) {
+ if (p4d_none(*p4d) && !pgtable_l5_enabled()) {
set_p4d(p4d, *p4d_k);
arch_flush_lazy_mmu_mode();
} else {
diff --git a/arch/x86/mm/ident_map.c b/arch/x86/mm/ident_map.c
index a2f0c7e20fb0..fe7a12599d8e 100644
--- a/arch/x86/mm/ident_map.c
+++ b/arch/x86/mm/ident_map.c
@@ -123,7 +123,7 @@ int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
result = ident_p4d_init(info, p4d, addr, next);
if (result)
return result;
- if (pgtable_l5_enabled) {
+ if (pgtable_l5_enabled()) {
set_pgd(pgd, __pgd(__pa(p4d) | info->kernpg_flag));
} else {
/*
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0a400606dea0..17383f9677fa 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -180,7 +180,7 @@ static void sync_global_pgds_l4(unsigned long start, unsigned long end)
*/
void sync_global_pgds(unsigned long start, unsigned long end)
{
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
sync_global_pgds_l5(start, end);
else
sync_global_pgds_l4(start, end);
@@ -643,7 +643,7 @@ phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
unsigned long vaddr = (unsigned long)__va(paddr);
int i = p4d_index(vaddr);

- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end, page_size_mask);

for (; i < PTRS_PER_P4D; i++, paddr = paddr_next) {
@@ -723,7 +723,7 @@ kernel_physical_mapping_init(unsigned long paddr_start,
page_size_mask);

spin_lock(&init_mm.page_table_lock);
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
pgd_populate(&init_mm, pgd, p4d);
else
p4d_populate(&init_mm, p4d_offset(pgd, vaddr), (pud_t *) p4d);
@@ -1100,7 +1100,7 @@ remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
* 5-level case we should free them. This code will have to change
* to adapt for boot-time switching between 4 and 5 level page tables.
*/
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
free_pud_table(pud_base, p4d);
}

diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 340bb9b32e01..e3e77527f8df 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -180,7 +180,7 @@ static void __init clear_pgds(unsigned long start,
* With folded p4d, pgd_clear() is nop, use p4d_clear()
* instead.
*/
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
pgd_clear(pgd);
else
p4d_clear(p4d_offset(pgd, start));
@@ -195,7 +195,7 @@ static inline p4d_t *early_p4d_offset(pgd_t *pgd, unsigned long addr)
{
unsigned long p4d;

- if (!pgtable_l5_enabled)
+ if (!pgtable_l5_enabled())
return (p4d_t *)pgd;

p4d = __pa_nodebug(pgd_val(*pgd)) & PTE_PFN_MASK;
@@ -282,7 +282,7 @@ void __init kasan_early_init(void)
for (i = 0; i < PTRS_PER_PUD; i++)
kasan_zero_pud[i] = __pud(pud_val);

- for (i = 0; pgtable_l5_enabled && i < PTRS_PER_P4D; i++)
+ for (i = 0; pgtable_l5_enabled() && i < PTRS_PER_P4D; i++)
kasan_zero_p4d[i] = __p4d(p4d_val);

kasan_map_early_shadow(early_top_pgt);
@@ -313,7 +313,7 @@ void __init kasan_init(void)
* bunch of things like kernel code, modules, EFI mapping, etc.
* We need to take extra steps to not overwrite them.
*/
- if (pgtable_l5_enabled) {
+ if (pgtable_l5_enabled()) {
void *ptr;

ptr = (void *)pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_END));
diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c
index 615cc03ced84..61db77b0eda9 100644
--- a/arch/x86/mm/kaslr.c
+++ b/arch/x86/mm/kaslr.c
@@ -78,7 +78,7 @@ void __init kernel_randomize_memory(void)
struct rnd_state rand_state;
unsigned long remain_entropy;

- vaddr_start = pgtable_l5_enabled ? __PAGE_OFFSET_BASE_L5 : __PAGE_OFFSET_BASE_L4;
+ vaddr_start = pgtable_l5_enabled() ? __PAGE_OFFSET_BASE_L5 : __PAGE_OFFSET_BASE_L4;
vaddr = vaddr_start;

/*
@@ -124,7 +124,7 @@ void __init kernel_randomize_memory(void)
*/
entropy = remain_entropy / (ARRAY_SIZE(kaslr_regions) - i);
prandom_bytes_state(&rand_state, &rand, sizeof(rand));
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
entropy = (rand % (entropy + 1)) & P4D_MASK;
else
entropy = (rand % (entropy + 1)) & PUD_MASK;
@@ -136,7 +136,7 @@ void __init kernel_randomize_memory(void)
* randomization alignment.
*/
vaddr += get_padding(&kaslr_regions[i]);
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
vaddr = round_up(vaddr + 1, P4D_SIZE);
else
vaddr = round_up(vaddr + 1, PUD_SIZE);
@@ -212,7 +212,7 @@ void __meminit init_trampoline(void)
return;
}

- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
init_trampoline_p4d();
else
init_trampoline_pud();
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index e055d1a06699..6eb1f34c3c85 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -157,7 +157,7 @@ static void sync_current_stack_to_mm(struct mm_struct *mm)
unsigned long sp = current_stack_pointer;
pgd_t *pgd = pgd_offset(mm, sp);

- if (pgtable_l5_enabled) {
+ if (pgtable_l5_enabled()) {
if (unlikely(pgd_none(*pgd))) {
pgd_t *pgd_ref = pgd_offset_k(sp);

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index bed7e7f4e44c..e01f7ceb9e7a 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -225,7 +225,7 @@ int __init efi_alloc_page_tables(void)

pud = pud_alloc(&init_mm, p4d, EFI_VA_END);
if (!pud) {
- if (pgtable_l5_enabled)
+ if (pgtable_l5_enabled())
free_page((unsigned long) pgd_page_vaddr(*pgd));
free_pages((unsigned long)efi_pgd, PGD_ALLOCATION_ORDER);
return -ENOMEM;
diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
index ccf4a49bb065..67ccf64c8bd8 100644
--- a/arch/x86/power/hibernate_64.c
+++ b/arch/x86/power/hibernate_64.c
@@ -72,7 +72,7 @@ static int set_up_temporary_text_mapping(pgd_t *pgd)
* tables used by the image kernel.
*/

- if (pgtable_l5_enabled) {
+ if (pgtable_l5_enabled()) {
p4d = (p4d_t *)get_safe_page(GFP_ATOMIC);
if (!p4d)
return -ENOMEM;
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