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-rw-r--r--kernel/crash_dump.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/crash_dump.c b/kernel/crash_dump.c
index 5f85690285d4..69ebf3380bac 100644
--- a/kernel/crash_dump.c
+++ b/kernel/crash_dump.c
@@ -20,8 +20,15 @@ unsigned long saved_max_pfn;
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/*
+ * stores the size of elf header of crash image
+ */
+unsigned long long elfcorehdr_size;
+
+/*
* elfcorehdr= specifies the location of elf core header stored by the crashed
* kernel. This option will be passed by kexec loader to the capture kernel.
+ *
+ * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
*/
static int __init setup_elfcorehdr(char *arg)
{
@@ -29,6 +36,10 @@ static int __init setup_elfcorehdr(char *arg)
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &end);
+ if (*end == '@') {
+ elfcorehdr_size = elfcorehdr_addr;
+ elfcorehdr_addr = memparse(end + 1, &end);
+ }
return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);