X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fvmalloc.c;h=86897ee792d6b4a2f8e00a94cf4b12e2c1d6f075;hb=81ca70343f4d85637ac19b529dbcccd1db69a41d;hp=7b450798b458874f4f835aba6be4acb8da1cb35d;hpb=c0bc8721b8d0380ec69fa97578c91201201b05a9;p=linux-2.6-omap-h63xx.git

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7b450798b45..86897ee792d 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -24,6 +24,9 @@
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;
 
+static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
+			    int node);
+
 static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end)
 {
 	pte_t *pte;
@@ -157,13 +160,15 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
 	return err;
 }
 
-struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
-				unsigned long start, unsigned long end, int node)
+static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
+					    unsigned long start, unsigned long end,
+					    int node, gfp_t gfp_mask)
 {
 	struct vm_struct **p, *tmp, *area;
 	unsigned long align = 1;
 	unsigned long addr;
 
+	BUG_ON(in_interrupt());
 	if (flags & VM_IOREMAP) {
 		int bit = fls(size);
 
@@ -176,15 +181,12 @@ struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
 	}
 	addr = ALIGN(start, align);
 	size = PAGE_ALIGN(size);
-
-	area = kmalloc_node(sizeof(*area), GFP_KERNEL, node);
-	if (unlikely(!area))
+	if (unlikely(!size))
 		return NULL;
 
-	if (unlikely(!size)) {
-		kfree (area);
+	area = kmalloc_node(sizeof(*area), gfp_mask & GFP_LEVEL_MASK, node);
+	if (unlikely(!area))
 		return NULL;
-	}
 
 	/*
 	 * We always allocate a guard page.
@@ -233,12 +235,11 @@ out:
 struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 				unsigned long start, unsigned long end)
 {
-	return __get_vm_area_node(size, flags, start, end, -1);
+	return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL);
 }
 
 /**
  *	get_vm_area  -  reserve a contingous kernel virtual area
- *
  *	@size:		size of the area
  *	@flags:		%VM_IOREMAP for I/O mappings or VM_ALLOC
  *
@@ -251,9 +252,11 @@ struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
 	return __get_vm_area(size, flags, VMALLOC_START, VMALLOC_END);
 }
 
-struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags, int node)
+struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags,
+				   int node, gfp_t gfp_mask)
 {
-	return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node);
+	return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node,
+				  gfp_mask);
 }
 
 /* Caller must hold vmlist_lock */
@@ -270,7 +273,7 @@ static struct vm_struct *__find_vm_area(void *addr)
 }
 
 /* Caller must hold vmlist_lock */
-struct vm_struct *__remove_vm_area(void *addr)
+static struct vm_struct *__remove_vm_area(void *addr)
 {
 	struct vm_struct **p, *tmp;
 
@@ -293,7 +296,6 @@ found:
 
 /**
  *	remove_vm_area  -  find and remove a contingous kernel virtual area
- *
  *	@addr:		base address
  *
  *	Search for the kernel VM area starting at @addr, and remove it.
@@ -340,7 +342,7 @@ void __vunmap(void *addr, int deallocate_pages)
 			__free_page(area->pages[i]);
 		}
 
-		if (area->nr_pages > PAGE_SIZE/sizeof(struct page *))
+		if (area->flags & VM_VPAGES)
 			vfree(area->pages);
 		else
 			kfree(area->pages);
@@ -352,7 +354,6 @@ void __vunmap(void *addr, int deallocate_pages)
 
 /**
  *	vfree  -  release memory allocated by vmalloc()
- *
  *	@addr:		memory base address
  *
  *	Free the virtually contiguous memory area starting at @addr, as
@@ -370,7 +371,6 @@ EXPORT_SYMBOL(vfree);
 
 /**
  *	vunmap  -  release virtual mapping obtained by vmap()
- *
  *	@addr:		memory base address
  *
  *	Free the virtually contiguous memory area starting at @addr,
@@ -387,7 +387,6 @@ EXPORT_SYMBOL(vunmap);
 
 /**
  *	vmap  -  map an array of pages into virtually contiguous space
- *
  *	@pages:		array of page pointers
  *	@count:		number of pages to map
  *	@flags:		vm_area->flags
@@ -427,10 +426,14 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 
 	area->nr_pages = nr_pages;
 	/* Please note that the recursion is strictly bounded. */
-	if (array_size > PAGE_SIZE)
+	if (array_size > PAGE_SIZE) {
 		pages = __vmalloc_node(array_size, gfp_mask, PAGE_KERNEL, node);
-	else
-		pages = kmalloc_node(array_size, (gfp_mask & ~__GFP_HIGHMEM), node);
+		area->flags |= VM_VPAGES;
+	} else {
+		pages = kmalloc_node(array_size,
+				(gfp_mask & ~(__GFP_HIGHMEM | __GFP_ZERO)),
+				node);
+	}
 	area->pages = pages;
 	if (!area->pages) {
 		remove_vm_area(area->addr);
@@ -467,7 +470,6 @@ void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
 
 /**
  *	__vmalloc_node  -  allocate virtually contiguous memory
- *
  *	@size:		allocation size
  *	@gfp_mask:	flags for the page level allocator
  *	@prot:		protection mask for the allocated pages
@@ -477,8 +479,8 @@ void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
  *	allocator with @gfp_mask flags.  Map them into contiguous
  *	kernel virtual space, using a pagetable protection of @prot.
  */
-void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
-			int node)
+static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
+			    int node)
 {
 	struct vm_struct *area;
 
@@ -486,13 +488,12 @@ void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
 	if (!size || (size >> PAGE_SHIFT) > num_physpages)
 		return NULL;
 
-	area = get_vm_area_node(size, VM_ALLOC, node);
+	area = get_vm_area_node(size, VM_ALLOC, node, gfp_mask);
 	if (!area)
 		return NULL;
 
 	return __vmalloc_area_node(area, gfp_mask, prot, node);
 }
-EXPORT_SYMBOL(__vmalloc_node);
 
 void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
 {
@@ -502,13 +503,11 @@ EXPORT_SYMBOL(__vmalloc);
 
 /**
  *	vmalloc  -  allocate virtually contiguous memory
- *
  *	@size:		allocation size
- *
  *	Allocate enough pages to cover @size from the page level
  *	allocator and map them into contiguous kernel virtual space.
  *
- *	For tight cotrol over page level allocator and protection flags
+ *	For tight control over page level allocator and protection flags
  *	use __vmalloc() instead.
  */
 void *vmalloc(unsigned long size)
@@ -518,11 +517,11 @@ void *vmalloc(unsigned long size)
 EXPORT_SYMBOL(vmalloc);
 
 /**
- *	vmalloc_user  -  allocate virtually contiguous memory which has
- *			   been zeroed so it can be mapped to userspace without
- *			   leaking data.
+ * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
+ * @size: allocation size
  *
- *	@size:		allocation size
+ * The resulting memory area is zeroed so it can be mapped to userspace
+ * without leaking data.
  */
 void *vmalloc_user(unsigned long size)
 {
@@ -530,25 +529,25 @@ void *vmalloc_user(unsigned long size)
 	void *ret;
 
 	ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
-	write_lock(&vmlist_lock);
-	area = __find_vm_area(ret);
-	area->flags |= VM_USERMAP;
-	write_unlock(&vmlist_lock);
-
+	if (ret) {
+		write_lock(&vmlist_lock);
+		area = __find_vm_area(ret);
+		area->flags |= VM_USERMAP;
+		write_unlock(&vmlist_lock);
+	}
 	return ret;
 }
 EXPORT_SYMBOL(vmalloc_user);
 
 /**
  *	vmalloc_node  -  allocate memory on a specific node
- *
  *	@size:		allocation size
  *	@node:		numa node
  *
  *	Allocate enough pages to cover @size from the page level
  *	allocator and map them into contiguous kernel virtual space.
  *
- *	For tight cotrol over page level allocator and protection flags
+ *	For tight control over page level allocator and protection flags
  *	use __vmalloc() instead.
  */
 void *vmalloc_node(unsigned long size, int node)
@@ -563,14 +562,13 @@ EXPORT_SYMBOL(vmalloc_node);
 
 /**
  *	vmalloc_exec  -  allocate virtually contiguous, executable memory
- *
  *	@size:		allocation size
  *
  *	Kernel-internal function to allocate enough pages to cover @size
  *	the page level allocator and map them into contiguous and
  *	executable kernel virtual space.
  *
- *	For tight cotrol over page level allocator and protection flags
+ *	For tight control over page level allocator and protection flags
  *	use __vmalloc() instead.
  */
 
@@ -581,7 +579,6 @@ void *vmalloc_exec(unsigned long size)
 
 /**
  *	vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
- *
  *	@size:		allocation size
  *
  *	Allocate enough 32bit PA addressable pages to cover @size from the
@@ -594,11 +591,11 @@ void *vmalloc_32(unsigned long size)
 EXPORT_SYMBOL(vmalloc_32);
 
 /**
- *	vmalloc_32_user  -  allocate virtually contiguous memory (32bit
- *			      addressable) which is zeroed so it can be
- *			      mapped to userspace without leaking data.
- *
+ * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory
  *	@size:		allocation size
+ *
+ * The resulting memory area is 32bit addressable and zeroed so it can be
+ * mapped to userspace without leaking data.
  */
 void *vmalloc_32_user(unsigned long size)
 {
@@ -606,11 +603,12 @@ void *vmalloc_32_user(unsigned long size)
 	void *ret;
 
 	ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
-	write_lock(&vmlist_lock);
-	area = __find_vm_area(ret);
-	area->flags |= VM_USERMAP;
-	write_unlock(&vmlist_lock);
-
+	if (ret) {
+		write_lock(&vmlist_lock);
+		area = __find_vm_area(ret);
+		area->flags |= VM_USERMAP;
+		write_unlock(&vmlist_lock);
+	}
 	return ret;
 }
 EXPORT_SYMBOL(vmalloc_32_user);
@@ -692,7 +690,6 @@ finished:
 
 /**
  *	remap_vmalloc_range  -  map vmalloc pages to userspace
- *
  *	@vma:		vma to cover (map full range of vma)
  *	@addr:		vmalloc memory
  *	@pgoff:		number of pages into addr before first page to map