lkml.org 
[lkml]   [2008]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 3/3] Limit E820 map when a user-defined memory map is specified
    On Wed, Jun 25, 2008 at 5:02 AM, Bernhard Walle <bwalle@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@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


    \
     
     \ /
      Last update: 2008-06-25 18:03    [W:2.655 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site