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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-05-06 14:50:13 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:57 -0700
commit06abdfb47ee745a4d79721de24260815ec6bca2b (patch)
treeafbf3f7a0f020529317ec115d2b5f62f67c84404
parent036e08568cbee4b16e14551e9f004c3d490d6271 (diff)
get_unmapped_area handles MAP_FIXED in generic code
generic arch_get_unmapped_area() now handles MAP_FIXED. Now that all implementations have been fixed, change the toplevel get_unmapped_area() to call into arch or drivers for the MAP_FIXED case. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Andi Kleen <ak@suse.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <willy@debian.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Irwin <bill.irwin@oracle.com> Cc: Adam Litke <agl@us.ibm.com> Cc: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mmap.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 88da687bde89..a6b7c796352b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1200,6 +1200,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
if (len > TASK_SIZE)
return -ENOMEM;
+ if (flags & MAP_FIXED)
+ return addr;
+
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
@@ -1273,6 +1276,9 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
if (len > TASK_SIZE)
return -ENOMEM;
+ if (flags & MAP_FIXED)
+ return addr;
+
/* requesting a specific address */
if (addr) {
addr = PAGE_ALIGN(addr);
@@ -1361,22 +1367,21 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
unsigned long ret;
-
- if (!(flags & MAP_FIXED)) {
- unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
-
- get_area = current->mm->get_unmapped_area;
- if (file && file->f_op && file->f_op->get_unmapped_area)
- get_area = file->f_op->get_unmapped_area;
- addr = get_area(file, addr, len, pgoff, flags);
- if (IS_ERR_VALUE(addr))
- return addr;
- }
+ unsigned long (*get_area)(struct file *, unsigned long,
+ unsigned long, unsigned long, unsigned long);
+
+ get_area = current->mm->get_unmapped_area;
+ if (file && file->f_op && file->f_op->get_unmapped_area)
+ get_area = file->f_op->get_unmapped_area;
+ addr = get_area(file, addr, len, pgoff, flags);
+ if (IS_ERR_VALUE(addr))
+ return addr;
if (addr > TASK_SIZE - len)
return -ENOMEM;
if (addr & ~PAGE_MASK)
return -EINVAL;
+
if (file && is_file_hugepages(file)) {
/*
* Check if the given range is hugepage aligned, and

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