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authorHugh Dickins <hugh@veritas.com>2005-11-21 21:32:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-22 09:13:42 -0800
commit83e9b7e929d1323b9a155d186f77aa8c06155cc3 (patch)
tree3cad39e867ca337b08bc4a7309c2b17787abd527 /mm/mprotect.c
parented5297a94090d9a9f27b0ce1f9601ebe73561cff (diff)
downloadvexpress-lsk-83e9b7e929d1323b9a155d186f77aa8c06155cc3.tar.gz
[PATCH] unpaged: private write VM_RESERVED
The PageReserved removal in 2.6.15-rc1 issued a "deprecated" message when you tried to mmap or mprotect MAP_PRIVATE PROT_WRITE a VM_RESERVED, and failed with -EACCES: because do_wp_page lacks the refinement to COW pages in those areas, nor do we expect to find anonymous pages in them; and it seemed just bloat to add code for handling such a peculiar case. But immediately it caused vbetool and ddcprobe (using lrmi) to fail. So revert the "deprecated" messages, letting mmap and mprotect succeed. But leave do_wp_page's BUG_ON(vma->vm_flags & VM_RESERVED) in place until we've added the code to do it right: so this particular patch is only good if the app doesn't really need to write to that private area. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 17a2b52b753..653b8571c1e 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -124,14 +124,6 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
* a MAP_NORESERVE private mapping to writable will now reserve.
*/
if (newflags & VM_WRITE) {
- if (oldflags & VM_RESERVED) {
- BUG_ON(oldflags & VM_WRITE);
- printk(KERN_WARNING "program %s is using MAP_PRIVATE, "
- "PROT_WRITE mprotect of VM_RESERVED memory, "
- "which is deprecated. Please report this to "
- "linux-kernel@vger.kernel.org\n",current->comm);
- return -EACCES;
- }
if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_SHARED|VM_HUGETLB))) {
charged = nrpages;
if (security_vm_enough_memory(charged))