[PATCH] Increase number of e820 entries hard limit from 32 to 128

The specifications that talk about E820 map doesn't have an upper limit on
the number of e820 entries.  But, today's kernel has a hard limit of 32.
With increase in memory size, we are seeing the number of E820 entries
reaching close to 32.  Patch below bumps the number upto 128.

The patch changes the location of EDDBUF in zero-page (as it comes after E820).
As, EDDBUF is not used by boot loaders, this patch should not have any effect
on bootloader-setup code interface.

Patch covers both i386 and x86-64.

Tested on:
* grub booting bzImage
* lilo booting bzImage with EDID info enabled
* pxeboot of bzImage

Side-effect:
bss increases by ~ 2K and init.data increases by ~7.5K
on all systems, due to increase in size of static arrays.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 3 insertions, 2 deletions

diff --git a/include/asm-x86_64/bootsetup.h b/include/asm-x86_64/bootsetup.h
index b570a484dc50..b829f7b534be 100644
--- a/include/asm-x86_64/bootsetup.h
+++ b/include/asm-x86_64/bootsetup.h
@@ -2,7 +2,8 @@
 #ifndef _X86_64_BOOTSETUP_H
 #define _X86_64_BOOTSETUP_H 1
 
-extern char x86_boot_params[2048];
+#define BOOT_PARAM_SIZE         4096
+extern char x86_boot_params[BOOT_PARAM_SIZE];
 
 /*
  * This is set up by the setup-routine at boot-time
diff --git a/include/asm-x86_64/e820.h b/include/asm-x86_64/e820.h
index 08f83a4b4f4a..8e94edf0b984 100644
--- a/include/asm-x86_64/e820.h
+++ b/include/asm-x86_64/e820.h
@@ -14,7 +14,7 @@
 #include <linux/mmzone.h>
 
 #define E820MAP 0x2d0           /* our map */
-#define E820MAX 32              /* number of entries in E820MAP */
+#define E820MAX 128             /* number of entries in E820MAP */
 #define E820NR  0x1e8           /* # entries in E820MAP */
 
 #define E820_RAM        1