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SubjectRe: [RFC][PATCH v3 18/22] mm, frv: add gfp flags variant of pud, pmd and pte allocations

- Added __pmd_alloc_one and __pud_alloc_one, which are same as pmd_alloc_one
and pud_alloc_one respectively, but has extra parameter to specify the
allocation flag

- Added __pte_alloc_one_kernel to allocate page using specified GFP flag

- Changed pte_alloc_one_kernel to call __pte_alloc_one_kernel passing
GFP_KERNEL allocation flag
- Helps in fixing the Bug 30702

Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com>
Signed-off-by: Anand Mitra <mitra@kqinfotech.com>
---
arch/frv/include/asm/pgalloc.h | 3 +++
arch/frv/include/asm/pgtable.h | 1 +
arch/frv/mm/pgalloc.c | 9 +++++++--
3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/frv/include/asm/pgalloc.h b/arch/frv/include/asm/pgalloc.h
index 416d19a..bfc4f7c 100644
--- a/arch/frv/include/asm/pgalloc.h
+++ b/arch/frv/include/asm/pgalloc.h
@@ -35,8 +35,10 @@ extern pgd_t *pgd_alloc(struct mm_struct *);
extern void pgd_free(struct mm_struct *mm, pgd_t *);

extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
+extern pte_t *__pte_alloc_one_kernel(struct mm_struct *, unsigned long, gfp_t);

extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
+extern pgtable_t __pte_alloc_one(struct mm_struct *, unsigned long, gfp_t);

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
@@ -60,6 +62,7 @@ do { \
* inside the pgd, so has no extra memory associated with it.
* (In the PAE case we free the pmds as part of the pgd.)
*/
+#define __pmd_alloc_one(mm, addr,mask) ({ BUG(); ((pmd_t *) 2); })
#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *) 2); })
#define pmd_free(mm, x) do { } while (0)
#define __pmd_free_tlb(tlb,x,a) do { } while (0)
diff --git a/arch/frv/include/asm/pgtable.h b/arch/frv/include/asm/pgtable.h
index 6bc241e..698e280 100644
--- a/arch/frv/include/asm/pgtable.h
+++ b/arch/frv/include/asm/pgtable.h
@@ -223,6 +223,7 @@ static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
* allocating and freeing a pud is trivial: the 1-entry pud is
* inside the pgd, so has no extra memory associated with it.
*/
+#define __pud_alloc_one(mm, address, mask) NULL
#define pud_alloc_one(mm, address) NULL
#define pud_free(mm, x) do { } while (0)
#define __pud_free_tlb(tlb, x, address) do { } while (0)
diff --git a/arch/frv/mm/pgalloc.c b/arch/frv/mm/pgalloc.c
index c42c83d..374cd2c 100644
--- a/arch/frv/mm/pgalloc.c
+++ b/arch/frv/mm/pgalloc.c
@@ -20,14 +20,19 @@

pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((aligned(PAGE_SIZE)));

-pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+pte_t *__pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address, gfp_t gfp_mask)
{
- pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+ pte_t *pte = (pte_t *)__get_free_page(gfp_mask);
if (pte)
clear_page(pte);
return pte;
}

+pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+ return __pte_alloc_one_kernel(mm, address, GFP_KERNEL | __GFP_REPEAT);
+}
+
pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
struct page *page;
--
1.7.0.4


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