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xtensa: mm: fix PMD folding implementation

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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>
This commit is contained in:
Mike Rapoport 2019-11-05 16:33:19 +02:00 committed by Max Filippov
parent 8951eb1530
commit f0d1eab8c2
5 changed files with 19 additions and 9 deletions
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3
arch/xtensa/include/asm/pgtable.h
View File

@ -371,9 +371,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
/* Find an entry in the second-level page table.. */
#define pmd_offset(dir,address) ((pmd_t*)(dir))
/* Find an entry in the third-level page table.. */
#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir,addr) \

10
arch/xtensa/mm/fault.c
View File

@ -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;

6
arch/xtensa/mm/kasan_init.c
View File

@ -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)

3
arch/xtensa/mm/mmu.c
View File

@ -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;

6
arch/xtensa/mm/tlb.c
View File

@ -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);