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authorMike Rapoport <rppt@linux.ibm.com>2019-11-05 16:33:19 +0200
committerMax Filippov <jcmvbkbc@gmail.com>2019-11-26 11:33:39 -0800
commitf0d1eab8c2e1f9240cf4ae4753d7947c65e60bd7 (patch)
treed7d8ecd9e6c38a6f52680888b1453a74b72a5823 /arch/xtensa/mm
parent8951eb1530ddf83dbb815d38e97afddc6a0d1140 (diff)
downloadlinux-f0d1eab8c2e1f9240cf4ae4753d7947c65e60bd7.tar.bz2
xtensa: mm: fix PMD folding implementation
There was a definition of pmd_offset() in arch/xtensa/include/asm/pgtable.h that shadowed the generic implementation defined in include/asm-generic/pgtable-nopmd.h. As the result, xtensa had shortcuts in page table traversal in several places instead of doing level unfolding. Remove local override for pmd_offset() and add page table unfolding where necessary. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Message-Id: <1572964400-16542-2-git-send-email-rppt@kernel.org> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/mm')
-rw-r--r--arch/xtensa/mm/fault.c10
-rw-r--r--arch/xtensa/mm/kasan_init.c6
-rw-r--r--arch/xtensa/mm/mmu.c3
-rw-r--r--arch/xtensa/mm/tlb.c6
4 files changed, 19 insertions, 6 deletions
diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c
index f81b1478da61..68a041402025 100644
--- a/arch/xtensa/mm/fault.c
+++ b/arch/xtensa/mm/fault.c
@@ -197,6 +197,7 @@ vmalloc_fault:
struct mm_struct *act_mm = current->active_mm;
int index = pgd_index(address);
pgd_t *pgd, *pgd_k;
+ pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
pte_t *pte_k;
@@ -211,8 +212,13 @@ vmalloc_fault:
pgd_val(*pgd) = pgd_val(*pgd_k);
- pmd = pmd_offset(pgd, address);
- pmd_k = pmd_offset(pgd_k, address);
+ pud = pud_offset(pgd, address);
+ pud_k = pud_offset(pgd_k, address);
+ if (!pud_present(*pud) || !pud_present(*pud_k))
+ goto bad_page_fault;
+
+ pmd = pmd_offset(pud, address);
+ pmd_k = pmd_offset(pud_k, address);
if (!pmd_present(*pmd) || !pmd_present(*pmd_k))
goto bad_page_fault;
diff --git a/arch/xtensa/mm/kasan_init.c b/arch/xtensa/mm/kasan_init.c
index af7152560bc3..ace98bdf5191 100644
--- a/arch/xtensa/mm/kasan_init.c
+++ b/arch/xtensa/mm/kasan_init.c
@@ -20,7 +20,8 @@ void __init kasan_early_init(void)
{
unsigned long vaddr = KASAN_SHADOW_START;
pgd_t *pgd = pgd_offset_k(vaddr);
- pmd_t *pmd = pmd_offset(pgd, vaddr);
+ pud_t *pud = pud_offset(pgd, vaddr);
+ pmd_t *pmd = pmd_offset(pud, vaddr);
int i;
for (i = 0; i < PTRS_PER_PTE; ++i)
@@ -42,7 +43,8 @@ static void __init populate(void *start, void *end)
unsigned long i, j;
unsigned long vaddr = (unsigned long)start;
pgd_t *pgd = pgd_offset_k(vaddr);
- pmd_t *pmd = pmd_offset(pgd, vaddr);
+ pud_t *pud = pud_offset(pgd, vaddr);
+ pmd_t *pmd = pmd_offset(pud, vaddr);
pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);
if (!pte)
diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c
index 03678c4afc39..018dda2c6a91 100644
--- a/arch/xtensa/mm/mmu.c
+++ b/arch/xtensa/mm/mmu.c
@@ -22,7 +22,8 @@
static void * __init init_pmd(unsigned long vaddr, unsigned long n_pages)
{
pgd_t *pgd = pgd_offset_k(vaddr);
- pmd_t *pmd = pmd_offset(pgd, vaddr);
+ pud_t *pud = pud_offset(pgd, vaddr);
+ pmd_t *pmd = pmd_offset(pud, vaddr);
pte_t *pte;
unsigned long i;
diff --git a/arch/xtensa/mm/tlb.c b/arch/xtensa/mm/tlb.c
index 59153d0aa890..164a2ca07a1f 100644
--- a/arch/xtensa/mm/tlb.c
+++ b/arch/xtensa/mm/tlb.c
@@ -169,6 +169,7 @@ static unsigned get_pte_for_vaddr(unsigned vaddr)
struct task_struct *task = get_current();
struct mm_struct *mm = task->mm;
pgd_t *pgd;
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -177,7 +178,10 @@ static unsigned get_pte_for_vaddr(unsigned vaddr)
pgd = pgd_offset(mm, vaddr);
if (pgd_none_or_clear_bad(pgd))
return 0;
- pmd = pmd_offset(pgd, vaddr);
+ pud = pud_offset(pgd, vaddr);
+ if (pud_none_or_clear_bad(pud))
+ return 0;
+ pmd = pmd_offset(pud, vaddr);
if (pmd_none_or_clear_bad(pmd))
return 0;
pte = pte_offset_map(pmd, vaddr);