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Subject[PATCH] x86: e820 remove the range instead of update it to reserved
Date

also let mem= to print out modified e820 map too

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

---
arch/x86/kernel/e820.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
Index: linux-2.6/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820.c
+++ linux-2.6/arch/x86/kernel/e820.c
@@ -1165,6 +1165,8 @@ static void early_panic(char *msg)
panic(msg);
}

+static int userdef __initdata;
+
/* "mem=nopentium" disables the 4MB page tables. */
static int __init parse_memopt(char *p)
{
@@ -1180,17 +1182,15 @@ static int __init parse_memopt(char *p)
}
#endif

+ userdef = 1;
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);
+ e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);

return 0;
}
early_param("mem", parse_memopt);

-static int userdef __initdata;
-
static int __init parse_memmap_opt(char *p)
{
char *oldp;
@@ -1230,8 +1230,7 @@ static int __init parse_memmap_opt(char
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);
+ e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
}
return *p == '\0' ? 0 : -EINVAL;
}

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