1 files changed, 32 insertions, 103 deletions

diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index 9ff5d0fac55..f1baadd56e8 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2011 Wind River Systems,
  *   written by Ralf Baechle <ralf@linux-mips.org>
  */
+#include <linux/compiler.h>
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
@@ -15,12 +16,11 @@
 #include <linux/sched.h>
 
 unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */
-
 EXPORT_SYMBOL(shm_align_mask);
 
 /* gap between mmap and stack */
 #define MIN_GAP (128*1024*1024UL)
-#define MAX_GAP        ((TASK_SIZE)/6*5)
+#define MAX_GAP ((TASK_SIZE)/6*5)
 
 static int mmap_is_legacy(void)
 {
@@ -45,25 +45,13 @@ static unsigned long mmap_base(unsigned long rnd)
 	return PAGE_ALIGN(TASK_SIZE - gap - rnd);
 }
 
-static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
-					      unsigned long pgoff)
-{
-	unsigned long base = addr & ~shm_align_mask;
-	unsigned long off = (pgoff << PAGE_SHIFT) & shm_align_mask;
-
-	if (base + off <= addr)
-		return base + off;
-
-	return base - off;
-}
-
-#define COLOUR_ALIGN(addr,pgoff)				\
+#define COLOUR_ALIGN(addr, pgoff)				\
 	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
 	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))
 
 enum mmap_allocation_direction {UP, DOWN};
 
-static unsigned long arch_get_unmapped_area_foo(struct file *filp,
+static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	unsigned long addr0, unsigned long len, unsigned long pgoff,
 	unsigned long flags, enum mmap_allocation_direction dir)
 {
@@ -71,6 +59,7 @@ static unsigned long arch_get_unmapped_area_foo(struct file *filp,
 	struct vm_area_struct *vma;
 	unsigned long addr = addr0;
 	int do_color_align;
+	struct vm_unmapped_area_info info;
 
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
@@ -103,105 +92,41 @@ static unsigned long arch_get_unmapped_area_foo(struct file *filp,
 
 		vma = find_vma(mm, addr);
 		if (TASK_SIZE - len >= addr &&
-		   (!vma || addr + len <= vma->vm_start))
+		    (!vma || addr + len <= vma->vm_start))
 			return addr;
 	}
 
-	if (dir == UP) {
-		addr = mm->mmap_base;
-			if (do_color_align)
-				addr = COLOUR_ALIGN(addr, pgoff);
-			else
-				addr = PAGE_ALIGN(addr);
-
-		for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
-			/* At this point:  (!vma || addr < vma->vm_end). */
-			if (TASK_SIZE - len < addr)
-				return -ENOMEM;
-			if (!vma || addr + len <= vma->vm_start)
-				return addr;
-			addr = vma->vm_end;
-			if (do_color_align)
-				addr = COLOUR_ALIGN(addr, pgoff);
-		 }
-	 } else {
-		/* check if free_area_cache is useful for us */
-		if (len <= mm->cached_hole_size) {
-			mm->cached_hole_size = 0;
-			mm->free_area_cache = mm->mmap_base;
-		}
-
-		/* either no address requested or can't fit in requested address hole */
-		addr = mm->free_area_cache;
-			if (do_color_align) {
-				unsigned long base =
-					COLOUR_ALIGN_DOWN(addr - len, pgoff);
-
-			addr = base + len;
-		 }
-
-		/* make sure it can fit in the remaining address space */
-		if (likely(addr > len)) {
-			vma = find_vma(mm, addr - len);
-			if (!vma || addr <= vma->vm_start) {
-				/* remember the address as a hint for next time */
-				return mm->free_area_cache = addr-len;
-			}
-		}
-
-		if (unlikely(mm->mmap_base < len))
-			goto bottomup;
-
-		addr = mm->mmap_base-len;
-		if (do_color_align)
-			addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-
-		do {
-			/*
-			 * Lookup failure means no vma is above this address,
-			 * else if new region fits below vma->vm_start,
-			 * return with success:
-			 */
-			vma = find_vma(mm, addr);
-			if (likely(!vma || addr+len <= vma->vm_start)) {
-				/* remember the address as a hint for next time */
-				return mm->free_area_cache = addr;
-			}
-
-			/* remember the largest hole we saw so far */
-			if (addr + mm->cached_hole_size < vma->vm_start)
-				mm->cached_hole_size = vma->vm_start - addr;
-
-			/* try just below the current vma->vm_start */
-			addr = vma->vm_start-len;
-			if (do_color_align)
-				addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-		} while (likely(len < vma->vm_start));
-
-bottomup:
+	info.length = len;
+	info.align_mask = do_color_align ? (PAGE_MASK & shm_align_mask) : 0;
+	info.align_offset = pgoff << PAGE_SHIFT;
+
+	if (dir == DOWN) {
+		info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+		info.low_limit = PAGE_SIZE;
+		info.high_limit = mm->mmap_base;
+		addr = vm_unmapped_area(&info);
+
+		if (!(addr & ~PAGE_MASK))
+			return addr;
+
 		/*
 		 * A failed mmap() very likely causes application failure,
 		 * so fall back to the bottom-up function here. This scenario
 		 * can happen with large stack limits and large mmap()
 		 * allocations.
 		 */
-		mm->cached_hole_size = ~0UL;
-		mm->free_area_cache = TASK_UNMAPPED_BASE;
-		addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
-		/*
-		 * Restore the topdown base:
-		 */
-		mm->free_area_cache = mm->mmap_base;
-		mm->cached_hole_size = ~0UL;
-
-		return addr;
 	}
+
+	info.flags = 0;
+	info.low_limit = mm->mmap_base;
+	info.high_limit = TASK_SIZE;
+	return vm_unmapped_area(&info);
 }
 
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr0,
 	unsigned long len, unsigned long pgoff, unsigned long flags)
 {
-	return arch_get_unmapped_area_foo(filp,
+	return arch_get_unmapped_area_common(filp,
 			addr0, len, pgoff, flags, UP);
 }
 
@@ -213,7 +138,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp,
 	unsigned long addr0, unsigned long len, unsigned long pgoff,
 	unsigned long flags)
 {
-	return arch_get_unmapped_area_foo(filp,
+	return arch_get_unmapped_area_common(filp,
 			addr0, len, pgoff, flags, DOWN);
 }
 
@@ -233,11 +158,9 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 	if (mmap_is_legacy()) {
 		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 		mm->get_unmapped_area = arch_get_unmapped_area;
-		mm->unmap_area = arch_unmap_area;
 	} else {
 		mm->mmap_base = mmap_base(random_factor);
 		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
-		mm->unmap_area = arch_unmap_area_topdown;
 	}
 }
 
@@ -267,3 +190,9 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
 
 	return ret;
 }
+
+int __virt_addr_valid(const volatile void *kaddr)
+{
+	return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
+}
+EXPORT_SYMBOL_GPL(__virt_addr_valid);