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>

2 files changed, 13 insertions, 8 deletions

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index c617174e896..b74e83b214c 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);
 	}
 }
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index a317336cdea..24dbf56928d 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -75,7 +75,7 @@ static __init void reserve_ebda(void)
 	if (ebda_size > 64*1024)
 		ebda_size = 64*1024;
 
-	reserve_early(ebda_addr, ebda_addr + ebda_size);
+	reserve_early(ebda_addr, ebda_addr + ebda_size, "EBDA");
 }
 
 void __init x86_64_start_kernel(char * real_mode_data)
@@ -105,14 +105,14 @@ void __init x86_64_start_kernel(char * real_mode_data)
 	pda_init(0);
 	copy_bootdata(__va(real_mode_data));
 
-	reserve_early(__pa_symbol(&_text), __pa_symbol(&_end));
+	reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
 
 	/* Reserve INITRD */
 	if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 		unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 		unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 		unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
-		reserve_early(ramdisk_image, ramdisk_end);
+		reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
 	}
 
 	reserve_ebda();