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arm64: pgalloc: consistently use PGALLOC_GFP

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We currently allocate different levels of page tables with a variety of
differing flags, and the PGALLOC_GFP flags, intended for use when
allocating any level of page table, are only used for ptes in
pte_alloc_one. On x86, PGALLOC_GFP is used for all page table
allocations.

Currently the major differences are:

* __GFP_NOTRACK -- Needed to ensure page tables are always accessible in
  the presence of kmemcheck to prevent recursive faults. Currently
  kmemcheck cannot be selected for arm64.

* __GFP_REPEAT -- Causes the allocator to try to reclaim pages and retry
  upon a failure to allocate.

* __GFP_ZERO -- Sometimes passed explicitly, sometimes zalloc variants
  are used.

While we've no encountered issues so far, it would be preferable to be
consistent. This patch ensures all levels of table are allocated in the
same manner, with PGALLOC_GFP.

Cc: Steve Capper <steve.capper@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2014-11-19 17:44:12 +00:00 committed by Will Deacon
parent d6c763afab
commit 15670ef1ea
2 changed files with 6 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
arch/arm64/include/asm/pgalloc.h
View file

@ -26,11 +26,13 @@
#define check_pgt_cache() do { } while (0)
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
#if CONFIG_ARM64_PGTABLE_LEVELS > 2
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
return (pmd_t *)__get_free_page(PGALLOC_GFP);
}
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
@ -50,7 +52,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return (pud_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
return (pud_t *)__get_free_page(PGALLOC_GFP);
}
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
@ -69,8 +71,6 @@ static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
{

4
arch/arm64/mm/pgd.c
View file

@ -35,9 +35,9 @@ static struct kmem_cache *pgd_cache;
pgd_t *pgd_alloc(struct mm_struct *mm)
{
if (PGD_SIZE == PAGE_SIZE)
return (pgd_t *)get_zeroed_page(GFP_KERNEL);
return (pgd_t *)__get_free_page(PGALLOC_GFP);
else
return kmem_cache_zalloc(pgd_cache, GFP_KERNEL);
return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
}
void pgd_free(struct mm_struct *mm, pgd_t *pgd)