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SubjectRe: [PATCH v2][RFC] add MAP_UNLOCKED mmap flag
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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