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SubjectRe: [RFC][PATCH v3 11/22] mm, parisc: add gfp flags variant of pmd and pte allocations

- Added __pte_alloc_one_kernel() function to allocate zeroed page using
passed allocation flag. The function pte_alloc_one_kernel() is changed to
call __pte_alloc_one_kernel() passing GFP_KERNEL | __GFP_REPEAT allocation
flags.

2-level page table support
- Added macro __pmd_alloc_one which is same as pmd_alloc_one, but has an extra
argument to pass gfp_t

3-level page table support
- Added function __pmd_alloc_one() to allocate pages using allocation flag.
The allocation flag is argument to the function.

- The function pmd_alloc_one() is changed to call __pmd_alloc_one(), passing
GFP_KERNEL | __GFP_REPEAT allocation flags.

- All these changes help in fixing the Bug 30702

Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com>
Signed-off-by: Anand Mitra <mitra@kqinfotech.com>
---
arch/parisc/include/asm/pgalloc.h | 21 ++++++++++++++++-----
1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index fc987a1..0284a43 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -61,15 +61,20 @@ static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT));
}

-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline pmd_t *
+__pmd_alloc_one(struct mm_struct *mm, unsigned long address, gfp_t gfp_mask)
{
- pmd_t *pmd = (pmd_t *)__get_free_pages(GFP_KERNEL|__GFP_REPEAT,
- PMD_ORDER);
+ pmd_t *pmd = (pmd_t *)__get_free_pages(gfp_mask, PMD_ORDER);
if (pmd)
memset(pmd, 0, PAGE_SIZE<<PMD_ORDER);
return pmd;
}

+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+ return __pmd_alloc_one(mm, address, GFP_KERNEL | __GFP_REPEAT);
+}
+
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
#ifdef CONFIG_64BIT
@@ -90,6 +95,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
* inside the pgd, so has no extra memory associated with it.
*/

+#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 pgd_populate(mm, pmd, pte) BUG()
@@ -127,10 +133,15 @@ pte_alloc_one(struct mm_struct *mm, unsigned long address)
}

static inline pte_t *
+__pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr, gfp_t gfp_mask)
+{
+ return (pte_t *)__get_free_page(gfp_mask | __GFP_ZERO);
+}
+
+static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
{
- pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
- return pte;
+ return __pte_alloc_one_kernel(mm, addr, GFP_KERNEL | __GFP_REPEAT);
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
--
1.7.0.4


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