x86: e820: user-defined memory maps: remove the range instead of update it to reserved

also let mem= to print out modified e820 map too

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 9836a079cfd9..3451e0b3f324 100644
--- a/arch/x86/kernel/e820.c
+++ b/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 *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);
+                e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
         }
         return *p == '\0' ? 0 : -EINVAL;
 }