diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | include/linux/crash_dump.h | 1 | ||||
| -rw-r--r-- | kernel/crash_dump.c | 11 |
3 files changed, 15 insertions, 3 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 93413ce96883..1fbe3625b2da 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -741,10 +741,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. See Documentation/block/cfq-iosched.txt and Documentation/block/deadline-iosched.txt for details. - elfcorehdr= [IA-64,PPC,SH,X86] + elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390] Specifies physical address of start of kernel core - image elf header. Generally kexec loader will - pass this option to capture kernel. + image elf header and optionally the size. Generally + kexec loader will pass this option to capture kernel. See Documentation/kdump/kdump.txt for details. enable_mtrr_cleanup [X86] diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h index 74054074e876..5c4abce94ad1 100644 --- a/include/linux/crash_dump.h +++ b/include/linux/crash_dump.h @@ -10,6 +10,7 @@ #define ELFCORE_ADDR_ERR (-2ULL) extern unsigned long long elfcorehdr_addr; +extern unsigned long long elfcorehdr_size; extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, unsigned long, int); 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); |