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authorHugh Dickins <hugh@veritas.com>2006-03-22 00:08:29 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:54:01 -0800
commita6f563db09c54c80d80e9013182dc512a5e53d0f (patch)
tree7fa43d6a7d83a30042356f06a9cc6b09472a70e7 /mm/mmap.c
parentfb8d14e172a29ba5ac69a73b61196be86fdfc3e1 (diff)
downloadop-kernel-dev-a6f563db09c54c80d80e9013182dc512a5e53d0f.zip
op-kernel-dev-a6f563db09c54c80d80e9013182dc512a5e53d0f.tar.gz
[PATCH] remove VM_DONTCOPY bogosities
Now that it's madvisable, remove two pieces of VM_DONTCOPY bogosity: 1. There was and is no logical reason why VM_DONTCOPY should be in the list of flags which forbid vma merging (and those drivers which set it are also setting VM_IO, which itself forbids the merge). 2. It's hard to understand the purpose of the VM_HUGETLB, VM_DONTCOPY block in vm_stat_account: but never mind, it's under CONFIG_HUGETLB, which (unlike CONFIG_HUGETLB_PAGE or CONFIG_HUGETLBFS) has never been defined. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c10
1 files changed, 1 insertions, 9 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 47556d2..0eb9894 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -612,7 +612,7 @@ again: remove_next = 1 + (end > next->vm_end);
* If the vma has a ->close operation then the driver probably needs to release
* per-vma resources, so we don't attempt to merge those.
*/
-#define VM_SPECIAL (VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
+#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
static inline int is_mergeable_vma(struct vm_area_struct *vma,
struct file *file, unsigned long vm_flags)
@@ -845,14 +845,6 @@ void vm_stat_account(struct mm_struct *mm, unsigned long flags,
const unsigned long stack_flags
= VM_STACK_FLAGS & (VM_GROWSUP|VM_GROWSDOWN);
-#ifdef CONFIG_HUGETLB
- if (flags & VM_HUGETLB) {
- if (!(flags & VM_DONTCOPY))
- mm->shared_vm += pages;
- return;
- }
-#endif /* CONFIG_HUGETLB */
-
if (file) {
mm->shared_vm += pages;
if ((flags & (VM_EXEC|VM_WRITE)) == VM_EXEC)
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