diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-10-21 01:23:16 -0700 |
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committer | Linus Torvalds <torvalds@evo.osdl.org> | 2004-10-21 01:23:16 -0700 |
commit | 58c358413ff89a2b29c860e8b339729058e0aba9 (patch) | |
tree | 5f84c80ca123a7250cae7e9ec53f86d66eaa6b53 /mm | |
parent | b43eeba1d8d524c300312ffcfd5ee680be23a8aa (diff) | |
download | history-58c358413ff89a2b29c860e8b339729058e0aba9.tar.gz |
remap_pfn_range: make the region special.
VM_IO tells the rest fo the world that the pages may
have side effects on reads/writes etc, and VM_RESERVED
historically told swap-out not to bother with it.
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index f91d57c96d1020..170f3f90cc0220 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -974,6 +974,15 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned lon if (from >= end) BUG(); + /* + * Physically remapped pages are special. Tell the + * rest of the world about it: + * VM_IO tells people not to look at these pages + * (accesses can have side effects). + * VM_RESERVED tells swapout not to try to touch + * this region. + */ + vma->vm_flags |= VM_IO | VM_RESERVED; spin_lock(&mm->page_table_lock); do { pmd_t *pmd = pmd_alloc(mm, dir, from); |