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SubjectRe: [RFC][PATCH v3 01/22] mm: Propagating GFP allocation flag inside __vmalloc()

linux/mm.h
- Added extra parameter gfp_t to __pud_alloc, __pmd_alloc, and __pte_alloc_kernel.

- Added function pud_alloc_with_mask() to allocate pud entry using the
specified allocation flag. The default modified pud_alloc() to call
pud_alloc_with_mask() with GFP_KERNEL.

- Similar modifications for pmd allocation.

- Added pte_alloc_kernel_with_mask() for pte allocations. The default
pte_alloc_kernel() modified to pte_alloc_kernel_with_mask() with GFP_KERNEL.

mm/memory.c
- Added an additional parameter gfp_t to __pte_alloc_kernel(). The function
calls __pte_alloc_one_kernel() passing the allocation flag.

- An additional argument gfp_t added to __pud_alloc(). It calls
__pud_alloc_one() and passes the allocation flag, down the call hierarchy.

- Similar modification for __pmd_alloc().

mm/vmalloc.c
- Added an extra parameter gfp_t to vmap_pte_range() and also changed the
function to call pte_alloc_kernel_with_mask() instead of pte_alloc_kernel().

- Added a gfp_t parameter to vmap_pmd_range(). Now it calls
pmd_alloc_with_mask(), also passes down the gfp_t to vmap_pte_range().

- Similar modification to vmap_pud_range().

- Added new function __vmap_page_range_noflush(), which is copy of the
function vmap_page_range_noflush(). This newly added function has an extra
allocation flag, which is passed down the call hierarchy.

- The function vmap_page_range_noflush() calls __vmap_page_range_noflush()
with allocation flag GFP_KERNEL.

- Added another version of function vmap_page_range() to pass down allocation
flag i.e. __vmap_page_range(). The function vmap_page_range() is changed to
call __vmap_page_range() with default GFP_KERNEL allocation flag.

- Added copy of function map_vm_area() i.e. __map_vm_area(). The map_vm_area()
is changed to call __map_vm_area() with default allocation flag.

These changes are done to fix the Bug 30702

Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com>
Signed-off-by: Anand Mitra <mitra@kqinfotech.com>
---
include/asm-generic/4level-fixup.h | 8 ++++-
include/asm-generic/pgtable-nopmd.h | 3 +-
include/asm-generic/pgtable-nopud.h | 1 +
include/linux/mm.h | 40 ++++++++++++++++++------
mm/memory.c | 14 +++++----
mm/vmalloc.c | 57 +++++++++++++++++++++++-----------
6 files changed, 85 insertions(+), 38 deletions(-)

diff --git a/include/asm-generic/4level-fixup.h b/include/asm-generic/4level-fixup.h
index 77ff547..f638309 100644
--- a/include/asm-generic/4level-fixup.h
+++ b/include/asm-generic/4level-fixup.h
@@ -10,10 +10,14 @@

#define pud_t pgd_t

-#define pmd_alloc(mm, pud, address) \
- ((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
+#define pmd_alloc_with_mask(mm, pud, address, mask) \
+ ((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address, mask))? \
NULL: pmd_offset(pud, address))

+#define pmd_alloc(mm, pud, address) \
+ pmd_alloc_with_mask(mm, pud, address, GFP_KERNEL)
+
+#define pud_alloc_with_mask(mm, pgd, address, mask) (pgd)
#define pud_alloc(mm, pgd, address) (pgd)
#define pud_offset(pgd, start) (pgd)
#define pud_none(pud) 0
diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h
index 725612b..96ca8da 100644
--- a/include/asm-generic/pgtable-nopmd.h
+++ b/include/asm-generic/pgtable-nopmd.h
@@ -55,7 +55,8 @@ static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pud, so has no extra memory associated with it.
*/
-#define pmd_alloc_one(mm, address) NULL
+#define __pmd_alloc_one(mm, address, mask) NULL
+#define pmd_alloc_one(mm, address) NULL
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
}
diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h
index 810431d..5a21868 100644
--- a/include/asm-generic/pgtable-nopud.h
+++ b/include/asm-generic/pgtable-nopud.h
@@ -50,6 +50,7 @@ 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, a) do { } while (0)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 679300c..9ec4bd7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1156,44 +1156,60 @@ static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,

#ifdef __PAGETABLE_PUD_FOLDED
static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
- unsigned long address)
+ unsigned long address, gfp_t gfp_mask)
{
return 0;
}
#else
-int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
+int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address,
+ gfp_t gfp_mask);
#endif

#ifdef __PAGETABLE_PMD_FOLDED
static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
- unsigned long address)
+ unsigned long address, gfp_t gfp_mask)
{
return 0;
}
#else
-int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
+int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address,
+ gfp_t gfp_mask);
#endif

int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long address);
-int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
+int __pte_alloc_kernel(pmd_t *pmd, unsigned long address, gfp_t gfp_mask);

/*
* The following ifdef needed to get the 4level-fixup.h header to work.
* Remove it when 4level-fixup.h has been removed.
*/
#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
-static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
+static inline pud_t *pud_alloc_with_mask(struct mm_struct *mm, pgd_t *pgd,
+ unsigned long address, gfp_t gfp_mask)
{
- return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
+ return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address, gfp_mask))?
NULL: pud_offset(pgd, address);
}

-static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
+static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd,
+ unsigned long address)
{
- return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
+ return pud_alloc_with_mask(mm, pgd, address, GFP_KERNEL);
+}
+
+static inline pmd_t *pmd_alloc_with_mask(struct mm_struct *mm, pud_t *pud,
+ unsigned long address, gfp_t gfp_mask)
+{
+ return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address, gfp_mask))?
NULL: pmd_offset(pud, address);
}
+
+static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud,
+ unsigned long address)
+{
+ return pmd_alloc_with_mask(mm, pud, address, GFP_KERNEL);
+}
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */

#if USE_SPLIT_PTLOCKS
@@ -1254,8 +1270,12 @@ static inline void pgtable_page_dtor(struct page *page)
pmd, address))? \
NULL: pte_offset_map_lock(mm, pmd, address, ptlp))

+#define pte_alloc_kernel_with_mask(pmd, address, mask) \
+ ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address, mask))? \
+ NULL: pte_offset_kernel(pmd, address))
+
#define pte_alloc_kernel(pmd, address) \
- ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
+ ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address, GFP_KERNEL))? \
NULL: pte_offset_kernel(pmd, address))

extern void free_area_init(unsigned long * zones_size);
diff --git a/mm/memory.c b/mm/memory.c
index 5823698..dc4964e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -433,9 +433,9 @@ int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
return 0;
}

-int __pte_alloc_kernel(pmd_t *pmd, unsigned long address)
+int __pte_alloc_kernel(pmd_t *pmd, unsigned long address, gfp_t gfp_mask)
{
- pte_t *new = pte_alloc_one_kernel(&init_mm, address);
+ pte_t *new = __pte_alloc_one_kernel(&init_mm, address, gfp_mask);
if (!new)
return -ENOMEM;

@@ -3343,9 +3343,10 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* Allocate page upper directory.
* We've already handled the fast-path in-line.
*/
-int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
+int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address,
+ gfp_t gfp_mask)
{
- pud_t *new = pud_alloc_one(mm, address);
+ pud_t *new = __pud_alloc_one(mm, address, gfp_mask);
if (!new)
return -ENOMEM;

@@ -3366,9 +3367,10 @@ int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
* Allocate page middle directory.
* We've already handled the fast-path in-line.
*/
-int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
+int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address,
+ gfp_t gfp_mask)
{
- pmd_t *new = pmd_alloc_one(mm, address);
+ pmd_t *new = __pmd_alloc_one(mm, address, gfp_mask);
if (!new)
return -ENOMEM;

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f9b1667..3df33fb 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -87,8 +87,8 @@ static void vunmap_page_range(unsigned long addr, unsigned long end)
} while (pgd++, addr = next, addr != end);
}

-static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
- unsigned long end, pgprot_t prot, struct page **pages, int *nr)
+static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, int *nr, gfp_t gfp_mask)
{
pte_t *pte;

@@ -97,7 +97,7 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
* callers keep track of where we're up to.
*/

- pte = pte_alloc_kernel(pmd, addr);
+ pte = pte_alloc_kernel_with_mask(pmd, addr, gfp_mask);
if (!pte)
return -ENOMEM;
do {
@@ -114,34 +114,34 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
}

static int vmap_pmd_range(pud_t *pud, unsigned long addr,
- unsigned long end, pgprot_t prot, struct page **pages, int *nr)
+ unsigned long end, pgprot_t prot, struct page **pages, int *nr, gfp_t gfp_mask)
{
pmd_t *pmd;
unsigned long next;

- pmd = pmd_alloc(&init_mm, pud, addr);
+ pmd = pmd_alloc_with_mask(&init_mm, pud, addr, gfp_mask);
if (!pmd)
return -ENOMEM;
do {
next = pmd_addr_end(addr, end);
- if (vmap_pte_range(pmd, addr, next, prot, pages, nr))
+ if (vmap_pte_range(pmd, addr, next, prot, pages, nr, gfp_mask))
return -ENOMEM;
} while (pmd++, addr = next, addr != end);
return 0;
}

-static int vmap_pud_range(pgd_t *pgd, unsigned long addr,
- unsigned long end, pgprot_t prot, struct page **pages, int *nr)
+static int vmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, int *nr, gfp_t gfp_mask)
{
pud_t *pud;
unsigned long next;

- pud = pud_alloc(&init_mm, pgd, addr);
+ pud = pud_alloc_with_mask(&init_mm, pgd, addr, gfp_mask);
if (!pud)
return -ENOMEM;
do {
next = pud_addr_end(addr, end);
- if (vmap_pmd_range(pud, addr, next, prot, pages, nr))
+ if (vmap_pmd_range(pud, addr, next, prot, pages, nr, gfp_mask))
return -ENOMEM;
} while (pud++, addr = next, addr != end);
return 0;
@@ -153,8 +153,8 @@ static int vmap_pud_range(pgd_t *pgd, unsigned long addr,
*
* Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N]
*/
-static int vmap_page_range_noflush(unsigned long start, unsigned long end,
- pgprot_t prot, struct page **pages)
+static int __vmap_page_range_noflush(unsigned long start, unsigned long end,
+ pgprot_t prot, struct page **pages, gfp_t gfp_mask)
{
pgd_t *pgd;
unsigned long next;
@@ -166,7 +166,7 @@ static int vmap_page_range_noflush(unsigned long start, unsigned long end,
pgd = pgd_offset_k(addr);
do {
next = pgd_addr_end(addr, end);
- err = vmap_pud_range(pgd, addr, next, prot, pages, &nr);
+ err = vmap_pud_range(pgd, addr, next, prot, pages, &nr, gfp_mask);
if (err)
return err;
} while (pgd++, addr = next, addr != end);
@@ -174,16 +174,29 @@ static int vmap_page_range_noflush(unsigned long start, unsigned long end,
return nr;
}

-static int vmap_page_range(unsigned long start, unsigned long end,
- pgprot_t prot, struct page **pages)
+
+static int vmap_page_range_noflush(unsigned long start, unsigned long end,
+ pgprot_t prot, struct page **pages)
+{
+ return __vmap_page_range_noflush(start, end, prot, pages, GFP_KERNEL);
+}
+
+static int __vmap_page_range(unsigned long start, unsigned long end,
+ pgprot_t prot, struct page **pages, gfp_t gfp_mask)
{
int ret;

- ret = vmap_page_range_noflush(start, end, prot, pages);
+ ret = __vmap_page_range_noflush(start, end, prot, pages, gfp_mask);
flush_cache_vmap(start, end);
return ret;
}

+static int vmap_page_range(unsigned long start, unsigned long end,
+ pgprot_t prot, struct page **pages)
+{
+ return __vmap_page_range(start, end, prot, pages, GFP_KERNEL);
+}
+
int is_vmalloc_or_module_addr(const void *x)
{
/*
@@ -1194,13 +1207,14 @@ void unmap_kernel_range(unsigned long addr, unsigned long size)
flush_tlb_kernel_range(addr, end);
}

-int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
+int __map_vm_area(struct vm_struct *area, pgprot_t prot,
+ struct page ***pages, gfp_t gfp_mask)
{
unsigned long addr = (unsigned long)area->addr;
unsigned long end = addr + area->size - PAGE_SIZE;
int err;

- err = vmap_page_range(addr, end, prot, *pages);
+ err = __vmap_page_range(addr, end, prot, *pages, gfp_mask);
if (err > 0) {
*pages += err;
err = 0;
@@ -1208,6 +1222,11 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)

return err;
}
+
+int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
+{
+ return __map_vm_area(area, prot, pages, GFP_KERNEL);
+}
EXPORT_SYMBOL_GPL(map_vm_area);

/*** Old vmalloc interfaces ***/
@@ -1522,7 +1541,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
area->pages[i] = page;
}

- if (map_vm_area(area, prot, &pages))
+ if (__map_vm_area(area, prot, &pages, gfp_mask))
goto fail;
return area->addr;

--
1.7.0.4


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