x86 boot: change sanitize_e820_map parameter from byte to int to allow bigger memory maps

The map size counter passed into, and back out of, sanitize_e820_map(),
was an eight bit type (char or u8), as derived from its origins in
legacy BIOS E820 structures.  This patch changes that type to an 'int',
to allow this sanitize routine to also be used on larger maps (larger
than the 256 count that fits in a char).  The legacy BIOS E820 interface
of course does not change; that remains at 8 bits for this count, holding
up to E820MAX == 128 entries.  But the kernel internals can handle more
when those additional memory map entries are passed from the BIOS via
EFI interfaces.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/mach-default/setup.c b/arch/x86/mach-default/setup.c
index 38a856c4fc07..56b4c39cb7fa 100644
--- a/arch/x86/mach-default/setup.c
+++ b/arch/x86/mach-default/setup.c
@@ -153,6 +153,7 @@ late_initcall(print_ipi_mode);
 char * __init machine_specific_memory_setup(void)
 {
         char *who;
+        int new_nr;
 
 
         who = "BIOS-e820";
@@ -163,9 +164,11 @@ char * __init machine_specific_memory_setup(void)
          * Otherwise fake a memory map; one section from 0k->640k,
          * the next section from 1mb->appropriate_mem_k
          */
+        new_nr = boot_params.e820_entries;
         sanitize_e820_map(boot_params.e820_map,
                         ARRAY_SIZE(boot_params.e820_map),
-                        &boot_params.e820_entries);
+                        &new_nr);
+        boot_params.e820_entries = new_nr;
         if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
             < 0) {
                 unsigned long mem_size;