[patch] reduce stack usage of sanitize_e820_map

Benjamin LaHaise
2002-08-15T21:44:30Z

Hello,

Currently, sanitize_e820_map uses 0x738 bytes of stack. The patch below
moves the arrays into __initdata, reducing stack usage to 0x34 bytes.

-ben

:r ~/patches/v2.5/v2.5.31-stack-e820.diff
diff -urN foo-v2.5.31/arch/i386/kernel/setup.c bar-v2.5.31/arch/i386/kernel/setup.c
--- foo-v2.5.31/arch/i386/kernel/setup.c Mon Jun 17 15:41:13 2002
+++ bar-v2.5.31/arch/i386/kernel/setup.c Thu Aug 15 17:47:41 2002
@@ -275,16 +275,17 @@
* replaces the original e820 map with a new one, removing overlaps.
*
*/
+struct change_member {
+ struct e820entry *pbios; /* pointer to original bios entry */
+ unsigned long long addr; /* address for this change point */
+};
+struct change_member change_point_list[2*E820MAX] __initdata;
+struct change_member *change_point[2*E820MAX] __initdata;
+struct e820entry *overlap_list[E820MAX] __initdata;
+struct e820entry new_bios[E820MAX] __initdata;
+
static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
{
- struct change_member {
- struct e820entry *pbios; /* pointer to original bios entry */
- unsigned long long addr; /* address for this change point */
- };
- struct change_member change_point_list[2*E820MAX];
- struct change_member *change_point[2*E820MAX];
- struct e820entry *overlap_list[E820MAX];
- struct e820entry new_bios[E820MAX];
struct change_member *change_tmp;
unsigned long current_type, last_type;
unsigned long long last_addr;