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

[Johannes Weiner]

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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