mm: unify module_alloc code for vmalloc

Four architectures (arm, mips, sparc, x86) use __vmalloc_area() for
module_init().  Much of the code is duplicated and can be generalized in a
globally accessible function, __vmalloc_node_range().

__vmalloc_node() now calls into __vmalloc_node_range() with a range of
[VMALLOC_START, VMALLOC_END) for functionally equivalent behavior.

Each architecture may then use __vmalloc_node_range() directly to remove
the duplication of code.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 14 insertions, 45 deletions

diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index 0c1bb68ff4a8..2cfe8161b478 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -38,17 +38,9 @@
 #ifdef CONFIG_MMU
 void *module_alloc(unsigned long size)
 {
-        struct vm_struct *area;
-
-        size = PAGE_ALIGN(size);
-        if (!size)
-                return NULL;
-
-        area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
-        if (!area)
-                return NULL;
-
-        return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
+        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+                                GFP_KERNEL, PAGE_KERNEL_EXEC, -1,
+                                __builtin_return_address(0));
 }
 #else /* CONFIG_MMU */
 void *module_alloc(unsigned long size)
diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c
index 6f51dda87fce..d87a72e9fac7 100644
--- a/arch/mips/kernel/module.c
+++ b/arch/mips/kernel/module.c
@@ -46,17 +46,9 @@ static DEFINE_SPINLOCK(dbe_lock);
 void *module_alloc(unsigned long size)
 {
 #ifdef MODULE_START
-        struct vm_struct *area;
-
-        size = PAGE_ALIGN(size);
-        if (!size)
-                return NULL;
-
-        area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);
-        if (!area)
-                return NULL;
-
-        return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
+        return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
+                                GFP_KERNEL, PAGE_KERNEL, -1,
+                                __builtin_return_address(0));
 #else
         if (size == 0)
                 return NULL;
diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c
index ee3c7dde8d9f..8d348c474a2f 100644
--- a/arch/sparc/kernel/module.c
+++ b/arch/sparc/kernel/module.c
@@ -23,17 +23,11 @@
 
 static void *module_map(unsigned long size)
 {
-        struct vm_struct *area;
-
-        size = PAGE_ALIGN(size);
-        if (!size || size > MODULES_LEN)
-                return NULL;
-
-        area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
-        if (!area)
+        if (PAGE_ALIGN(size) > MODULES_LEN)
                 return NULL;
-
-        return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
+        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+                                GFP_KERNEL, PAGE_KERNEL, -1,
+                                __builtin_return_address(0));
 }
 
 static char *dot2underscore(char *name)
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 8f2956091735..ab23f1ad4bf1 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -37,20 +37,11 @@
 
 void *module_alloc(unsigned long size)
 {
-        struct vm_struct *area;
-
-        if (!size)
-                return NULL;
-        size = PAGE_ALIGN(size);
-        if (size > MODULES_LEN)
+        if (PAGE_ALIGN(size) > MODULES_LEN)
                 return NULL;
-
-        area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
-        if (!area)
-                return NULL;
-
-        return __vmalloc_area(area, GFP_KERNEL | __GFP_HIGHMEM,
-                                        PAGE_KERNEL_EXEC);
+        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+                                GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC,
+                                -1, __builtin_return_address(0));
 }
 
 /* Free memory returned from module_alloc */