Messages in this thread |  | | | Date | Tue, 6 Oct 2009 20:34:36 +0200 | | From | Johannes Weiner <> | | Subject | Re: [PATCH v2][RFC] add MAP_UNLOCKED mmap flag |
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On Tue, Oct 06, 2009 at 07:02:18PM +0200, Gleb Natapov wrote: > diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h > index 32c8bd6..59e0f29 100644 > --- a/include/asm-generic/mman.h > +++ b/include/asm-generic/mman.h > @@ -12,6 +12,7 @@ > #define MAP_NONBLOCK 0x10000 /* do not block on IO */ > #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */ > #define MAP_HUGETLB 0x40000 /* create a huge page mapping */ > +#define MAP_UNLOCKED 0x80000 /* force page unlocking */ > > #define MCL_CURRENT 1 /* lock all current mappings */ > #define MCL_FUTURE 2 /* lock all future mappings */ > diff --git a/mm/mmap.c b/mm/mmap.c > index 73f5e4b..7c2abdb 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -985,6 +985,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, > if (!can_do_mlock()) > return -EPERM; > > + if (flags & MAP_UNLOKED) > + vm_flags &= ~VM_LOCKED;
That needs changing into MAP_UNLOCKED as well.
Should we do something special about (MAP_UNLOCKED | MAP_LOCKED)?
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