x86_64: add debug name for early_res

helps debugging problems in this rather murky area of code.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 5 deletions

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index c617174e8963..b74e83b214cc 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -54,30 +54,33 @@ static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
 
 struct early_res {
         unsigned long start, end;
+        char name[16];
 };
 static struct early_res early_res[MAX_EARLY_RES] __initdata = {
-        { 0, PAGE_SIZE },                       /* BIOS data page */
+        { 0, PAGE_SIZE, "BIOS data page" },                     /* BIOS data page */
 #ifdef CONFIG_SMP
-        { SMP_TRAMPOLINE_BASE, SMP_TRAMPOLINE_BASE + 2*PAGE_SIZE },
+        { SMP_TRAMPOLINE_BASE, SMP_TRAMPOLINE_BASE + 2*PAGE_SIZE, "SMP_TRAMPOLINE" },
 #endif
         {}
 };
 
-void __init reserve_early(unsigned long start, unsigned long end)
+void __init reserve_early(unsigned long start, unsigned long end, char *name)
 {
         int i;
         struct early_res *r;
         for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
                 r = &early_res[i];
                 if (end > r->start && start < r->end)
-                        panic("Overlapping early reservations %lx-%lx to %lx-%lx\n",
-                              start, end, r->start, r->end);
+                        panic("Overlapping early reservations %lx-%lx %s to %lx-%lx %s\n",
+                              start, end - 1, name?name:"", r->start, r->end - 1, r->name);
         }
         if (i >= MAX_EARLY_RES)
                 panic("Too many early reservations");
         r = &early_res[i];
         r->start = start;
         r->end = end;
+        if (name)
+                strncpy(r->name, name, sizeof(r->name) - 1);
 }
 
 void __init early_res_to_bootmem(void)
@@ -85,6 +88,8 @@ void __init early_res_to_bootmem(void)
         int i;
         for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
                 struct early_res *r = &early_res[i];
+                printk(KERN_INFO "early res: %d [%lx-%lx] %s\n", i,
+                        r->start, r->end - 1, r->name);
                 reserve_bootmem_generic(r->start, r->end - r->start);
         }
 }