Re: FIXMAP-related change to mm/memory.c

[Andrew Morton]

Roland McGrath <[e-mail]> wrote:
>
>  			static struct vm_area_struct fixmap_vma = {
>   				/* Catch users - if there are any valid
>   				   ones, we can make this be "&init_mm" or
>   				   something.  */
>   				.vm_mm = NULL,
>  -				.vm_start = FIXADDR_START,
>  -				.vm_end = FIXADDR_TOP,
>  +				.vm_start = FIXADDR_USER_START,
>  +				.vm_end = FIXADDR_USER_END,
>   				.vm_page_prot = PAGE_READONLY,
>   				.vm_flags = VM_READ | VM_EXEC,
>   			};

Note that the current version of this code does not compile for User Mode
Linux.  Its FIXADDR_TOP is not a constant.   It would be nice to fix that
this time around.

It appears that this patch will break x86_64, parisc and um.