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x86: limit E820 map when a user-defined memory map is specified

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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>
Acked-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: kexec@lists.infradead.org
Cc: vgoyal@redhat.com
Cc: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Bernhard Walle 2008-06-25 21:39:16 +02:00 committed by Ingo Molnar
parent 8207c2570a
commit 611dfd7819
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/e820.c
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@ -1117,6 +1117,9 @@ 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 - mem_size,
E820_RAM, E820_RESERVED);
return 0;
}
early_param("mem", parse_memopt);
@ -1161,6 +1164,8 @@ 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 - mem_size,
E820_RAM, E820_RESERVED);
}
return *p == '\0' ? 0 : -EINVAL;
}