[patch 2/3] IA64: log insertion of crashkernel region

[Horms <horms@verge.net.au>]

This patch adds a faclilty to print out a message regarding the success or
failure of inserting the crashkernel region. On systems with a large
ammount of memory, the chances of failure tend to be quite low, especially
now that the base address of the region can be determined by the kernel.
However, on systems with less memory, such as Xen's Domain 0, it
can occur, and silently failing is confusing to say the least.

It also updates the error message generated by kdump_find_rsvd_region()
if it can't locate a base address for the requested crashkernel region,
which is really just another failure mode for the problem detailed
in the paragraph above.

Signed-off-by: Simon Horman <horms@verge.net.au>

 linux-2.6/arch/ia64/kernel/efi.c |   25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

Index: linux-2.6/arch/ia64/kernel/efi.c
=================================--- linux-2.6.orig/arch/ia64/kernel/efi.c	2007-03-06 16:25:46.000000000 +0900
+++ linux-2.6/arch/ia64/kernel/efi.c	2007-03-06 16:25:46.000000000 +0900
@@ -1049,6 +1049,9 @@
 	u64 efi_desc_size;
 	char *name;
 	unsigned long flags;
+#ifdef CONFIG_KEXEC
+	int crashk_res_inserted = 0;
+#endif
 
 	efi_map_start = __va(ia64_boot_param->efi_memmap);
 	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
@@ -1125,11 +1128,25 @@
 #ifdef CONFIG_KEXEC
                         insert_resource(res, &efi_memmap_res);
                         insert_resource(res, &boot_param_res);
-			if (crashk_res.end > crashk_res.start)
-				insert_resource(res, &crashk_res);
+			if (!crashk_res_inserted &&
+			    crashk_res.end > crashk_res.start &&
+			    insert_resource(res, &crashk_res) >= 0)
+				crashk_res_inserted = 1;
+
 #endif
 		}
 	}
+
+	if (crashk_res.end > crashk_res.start) {
+		if (crashk_res_inserted)
+			printk(KERN_ERR "Kdump: registered crashdump: "
+			       "0x%08lx-0x%08lx\n", crashk_res.start,
+			       crashk_res.end);
+		else
+			printk(KERN_ERR "Kdump: failed to insert resource for "
+			       "crashdump: 0x%08lx-0x%08lx\n",
+			       crashk_res.start, crashk_res.end);
+	}
 }
 
 #ifdef CONFIG_KEXEC
@@ -1172,8 +1189,8 @@
 		return start;
   }
 
-  printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
-	size);
+  printk(KERN_WARNING "Kdump: failed to find a base address for 0x%lx bytes"
+	 "of memory for crashdump\n", size);
   return ~0UL;
 }
 #endif

--

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/