[PATCH 4/4] kexec-tools: mips: Try to include bss in kernel vmcore file.

[David Daney]

The kernel message buffers, as well as a lot of other useful data
reside in the bss section.  Without this vmcore-dmesg cannot work, and
debugging with a core dump is much more difficult.

Try to add the /proc/iomem "Kernel bss" section to vmcore.  If it is
not found, just do what we used to do and use "Kernel data" instead.

Signed-off-by: David Daney <david.daney at cavium.com>
---
 kexec/arch/mips/crashdump-mips.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kexec/arch/mips/crashdump-mips.c b/kexec/arch/mips/crashdump-mips.c
index e98badf..fc92e64 100644
--- a/kexec/arch/mips/crashdump-mips.c
+++ b/kexec/arch/mips/crashdump-mips.c
@@ -74,7 +74,10 @@ static int get_kernel_vaddr_and_size(struct crash_elf_info *elf_info,
 
 	elf_info->kern_vaddr_start = elf_info->kern_paddr_start |
 					start_offset;
-	if (parse_iomem_single("Kernel data\n", NULL, &end) == 0) {
+	/* If "Kernel bss" exists, the kernel ends there, else fall
+	 *  through and say that it ends at "Kernel data" */
+	if (parse_iomem_single("Kernel bss\n", NULL, &end) == 0 ||
+	    parse_iomem_single("Kernel data\n", NULL, &end) == 0) {
 		elf_info->kern_size = end - elf_info->kern_paddr_start;
 		dbgprintf("kernel_vaddr= 0x%llx paddr %llx\n",
 				elf_info->kern_vaddr_start,
-- 
2.9.5