On Wed, Jun 25, 2008 at 5:02 AM, Bernhard Walle <bwalle at suse.de> wrote:
> This patch brings back limiting of the E820 map when a user-defined
> E820 map is specified. While the behaviour of i386 (32 bit) was to limit
> the E820 map (and /proc/iomem), the behaviour of x86-64 (64 bit) was not to
> limit.
>
> That patch limits the E820 map again for both x86 architectures.
>
> Code was tested for compilation and booting on a 32 bit and 64 bit system.
>
>
> Signed-off-by: Bernhard Walle <bwalle at suse.de>
> ---
> arch/x86/kernel/e820.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> index 7d1109b..19b7f05 100644
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -979,6 +979,8 @@ static int __init parse_memopt(char *p)
>
> mem_size = memparse(p, &p);
> end_user_pfn = mem_size>>PAGE_SHIFT;
> + e820_update_range(mem_size, ULLONG_MAX, E820_RAM, E820_RESERVED);
> +
> return 0;
> }
> early_param("mem", parse_memopt);
> @@ -1023,6 +1025,7 @@ static int __init parse_memmap_opt(char *p)
> e820_add_region(start_at, mem_size, E820_RESERVED);
> } else {
> end_user_pfn = (mem_size >> PAGE_SHIFT);
> + e820_update_range(mem_size, ULLONG_MAX, E820_RAM, E820_RESERVED);
> }
> return *p == '\0' ? 0 : -EINVAL;
> }
> --
only this one is needed now. but please change ULLONG_MAX to
ULLONG_MAX - mem_size
YH
