mm: use vm_unmapped_area() on sparc32 architecture

Update the sparc32 arch_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.

Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Acked-by: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index a8e6eb0a11d503b2c611e69243f8edb9981dfae8..a59bc637f9af7d2b6435a81627a5bd50ad214cb3 100644 (file)
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -39,6 +39,7 @@ asmlinkage unsigned long sys_getpagesize(void)
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
        struct vm_area_struct * vmm;
+       struct vm_unmapped_area_info info;
 
        if (flags & MAP_FIXED) {
                /* We do not accept a shared mapping if it would violate
@@ -56,21 +57,14 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
        if (!addr)
                addr = TASK_UNMAPPED_BASE;
 
-       if (flags & MAP_SHARED)
-               addr = COLOUR_ALIGN(addr);
-       else
-               addr = PAGE_ALIGN(addr);
-
-       for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
-               /* At this point:  (!vmm || addr < vmm->vm_end). */
-               if (TASK_SIZE - PAGE_SIZE - len < addr)
-                       return -ENOMEM;
-               if (!vmm || addr + len <= vmm->vm_start)
-                       return addr;
-               addr = vmm->vm_end;
-               if (flags & MAP_SHARED)
-                       addr = COLOUR_ALIGN(addr);
-       }
+       info.flags = 0;
+       info.length = len;
+       info.low_limit = addr;
+       info.high_limit = TASK_SIZE;
+       info.align_mask = (flags & MAP_SHARED) ?
+               (PAGE_MASK & (SHMLBA - 1)) : 0;
+       info.align_offset = pgoff << PAGE_SHIFT;
+       return vm_unmapped_area(&info);
 }
 
 /*