Re: [RFC][PATCH v3 06/22] mm, sparc: add gfp flags variant of pmdand pte allocations

[Prasad Joshi]

32 bit architecture changes
 - Added a new marcos __pmd_alloc_one() which allow caller to pass the gfp_t
   allocation flag. The allocation flag is discarded, as the function
   pmd_alloc_one() does not allocate memory. The code for pte allocation is
   also modified the same way.

64 bit architecture changes
- Added function __pmd_alloc_one() to accept an additional allocation flag
  from caller. Similar to pmd_alloc_one() the function __pmd_alloc_one()
  calls quicklist_alloc() passing the allocation flag.

- pmd_alloc_one() calls __pmd_alloc_one().

- The similar changes are done for pte allocations.

- All these changes help in fixing the Bug 30702

Signed-off-by: Prasad Joshi <prasadjoshi124@xxxxxxxxx>
Signed-off-by: Anand Mitra <mitra@xxxxxxxxxxxxxx>
---
 arch/sparc/include/asm/pgalloc_32.h |    5 +++++
 arch/sparc/include/asm/pgalloc_64.h |   17 +++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/pgalloc_32.h b/arch/sparc/include/asm/pgalloc_32.h
index ca2b344..ad68597 100644
--- a/arch/sparc/include/asm/pgalloc_32.h
+++ b/arch/sparc/include/asm/pgalloc_32.h
@@ -41,6 +41,9 @@ BTFIXUPDEF_CALL(void, pgd_set, pgd_t *, pmd_t *)
 BTFIXUPDEF_CALL(pmd_t *, pmd_alloc_one, struct mm_struct *, unsigned long)
 #define pmd_alloc_one(mm, address)	BTFIXUP_CALL(pmd_alloc_one)(mm, address)
 
+BTFIXUPDEF_CALL(pmd_t *, __pmd_alloc_one, struct mm_struct *, unsigned long, gfp_t)
+#define __pmd_alloc_one(mm, address, gfp_mask)	BTFIXUP_CALL(pmd_alloc_one)(mm, address)
+
 BTFIXUPDEF_CALL(void, free_pmd_fast, pmd_t *)
 #define free_pmd_fast(pmd)	BTFIXUP_CALL(free_pmd_fast)(pmd)
 
@@ -57,6 +60,8 @@ BTFIXUPDEF_CALL(pgtable_t , pte_alloc_one, struct mm_struct *, unsigned long)
 #define pte_alloc_one(mm, address)	BTFIXUP_CALL(pte_alloc_one)(mm, address)
 BTFIXUPDEF_CALL(pte_t *, pte_alloc_one_kernel, struct mm_struct *, unsigned long)
 #define pte_alloc_one_kernel(mm, addr)	BTFIXUP_CALL(pte_alloc_one_kernel)(mm, addr)
+BTFIXUPDEF_CALL(pte_t *, __pte_alloc_one_kernel, struct mm_struct *, unsigned long, gfp_t)
+#define __pte_alloc_one_kernel(mm, addr, gfp_mask)	BTFIXUP_CALL(pte_alloc_one_kernel)(mm, addr)
 
 BTFIXUPDEF_CALL(void, free_pte_fast, pte_t *)
 #define pte_free_kernel(mm, pte)	BTFIXUP_CALL(free_pte_fast)(pte)
diff --git a/arch/sparc/include/asm/pgalloc_64.h b/arch/sparc/include/asm/pgalloc_64.h
index 5bdfa2c..a7952a5 100644
--- a/arch/sparc/include/asm/pgalloc_64.h
+++ b/arch/sparc/include/asm/pgalloc_64.h
@@ -26,9 +26,15 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 
 #define pud_populate(MM, PUD, PMD)	pud_set(PUD, PMD)
 
+static inline pmd_t *
+__pmd_alloc_one(struct mm_struct *mm, unsigned long addr, gfp_t gfp_mask)
+{
+	return quicklist_alloc(0, gfp_mask, NULL);
+}
+
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-	return quicklist_alloc(0, GFP_KERNEL, NULL);
+	return __pmd_alloc_one(mm, addr, GFP_KERNEL);
 }
 
 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
@@ -36,10 +42,17 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 	quicklist_free(0, NULL, pmd);
 }
 
+static inline pte_t *
+__pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address, 
+		gfp_t gfp_mask)
+{
+	return quicklist_alloc(0, gfp_mask, NULL);
+}
+
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 					  unsigned long address)
 {
-	return quicklist_alloc(0, GFP_KERNEL, NULL);
+	return __pte_alloc_one_kernel(mm, address, GFP_KERNEL);
 }
 
 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
-- 
1.7.0.4

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