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authorPaul Jackson <pj@sgi.com>2008-05-14 08:15:34 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-05-25 10:55:11 +0200
commitc3965bd15118742d72b4bc1a290d37b3f081eb98 (patch)
tree3c3acbdb900a54800d9f427b19ffb156ab16308f /arch/x86/boot/memory.c
parentb25e31cec7788ccba5749d10f8f4343fffff4750 (diff)
downloadlinux-c3965bd15118742d72b4bc1a290d37b3f081eb98.tar.gz
x86 boot: proper use of ARRAY_SIZE instead of repeated E820MAX constant
This patch is motivated by a subsequent patch which will allow for more memory map entries on EFI supported systems than can be passed via the x86 legacy BIOS E820 interface. The legacy interface is limited to E820MAX == 128 memory entries, and that "E820MAX" manifest constant was used as the size for several arrays and loops over those arrays. The primary change in this patch is to change code loop sizes over those arrays from using the constant E820MAX, to using the ARRAY_SIZE() macro evaluated for the array being looped. That way, a subsequent patch can change the size of some of these arrays, without breaking this code. This patch also adds a parameter to the sanitize_e820_map() routine, which had an implicit size for the array passed it of E820MAX entries. This new parameter explicitly passes the size of said array. Once again, this will allow a subsequent patch to change that array size for some calls to sanitize_e820_map() without breaking the code. As part of enhancing the sanitize_e820_map() interface this way, I further combined the unnecessarily distinct x86_32 and x86_64 declarations for this routine into a single, commonly used, declaration. This patch in itself should make no difference to the resulting kernel binary. [ mingo@elte.hu: merged to -tip ] Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/boot/memory.c')
-rw-r--r--arch/x86/boot/memory.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c
index acad32eb4290..53165c97336b 100644
--- a/arch/x86/boot/memory.c
+++ b/arch/x86/boot/memory.c
@@ -13,6 +13,7 @@
*/
#include "boot.h"
+#include <linux/kernel.h>
#define SMAP 0x534d4150 /* ASCII "SMAP" */
@@ -53,7 +54,7 @@ static int detect_memory_e820(void)
count++;
desc++;
- } while (next && count < E820MAX);
+ } while (next && count < ARRAY_SIZE(boot_params.e820_map));
return boot_params.e820_entries = count;
}