On Sat, Mar 28, 2015 at 10:49 AM, Thomas Meyer <tho...@m3y3r.de> wrote:
>
> Print a more sensible message about the minimum physical memory
> requirement.
>
> Signed-off-by: Thomas Meyer <tho...@m3y3r.de>
> ---
> diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
> index 549ecf3..a91cf05 100644
> --- a/arch/um/kernel/physmem.c
> +++ b/arch/um/kernel/physmem.c
> @@ -63,16 +63,23 @@ void __init setup_physmem(unsigned long start, unsigned
> long reserve_end,
> unsigned long reserve = reserve_end - start;
> int pfn = PFN_UP(__pa(reserve_end));
> int delta = (len - reserve) >> PAGE_SHIFT;
> - int err, offset, bootmap_size;
> + int err, offset, bootmap_size, map_size;
I think all "int" variables in this function (except for "err") should be
"unsigned long", to avoid overflows on 64-bit systems.
> + offset = uml_reserved - uml_physmem;
> + map_size = len - offset;
> + if(map_size <= 0) {
> + printf("Too few physical memory! Needed=%d, given=%d\n",
> + offset, len);
> + exit(1);
> + }
>
> physmem_fd = create_mem_file(len + highmem);
>
> - offset = uml_reserved - uml_physmem;
> err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
> - len - offset, 1, 1, 1);
> + map_size, 1, 1, 1);
> if (err < 0) {
> printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
> - "failed - errno = %d\n", len - offset,
> + "failed - errno = %d\n", map_size,
> (void *) uml_reserved, err);
> exit(1);
> }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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