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SubjectRe: [RFC][PATCH v3 21/22] mm, arm: add gfp flags variant of pmd and pte allocations

- Added __pmd_alloc_one, which is same as pmd_alloc_one, 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 newly added function using 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/arm/include/asm/pgalloc.h | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index 22de005..0696068 100644
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -28,6 +28,7 @@
/*
* Since we have only two-level page tables, these are trivial
*/
+#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, pmd) do { } while (0)
#define pgd_populate(mm,pmd,pte) BUG()
@@ -59,17 +60,23 @@ static inline void clean_pte_table(pte_t *pte)
* +------------+
*/
static inline pte_t *
-pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
+__pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr, gfp_t gfp_mask)
{
pte_t *pte;

- pte = (pte_t *)__get_free_page(PGALLOC_GFP);
+ pte = (pte_t *)__get_free_page(gfp_mask | __GFP_NOTRACK | __GFP_ZERO);
if (pte)
clean_pte_table(pte);

return pte;
}

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


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