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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2011-10-30 15:16:37 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:41 +0100
commitd3bf37955d46718ee1a7f1fc69f953d2328ba7c2 (patch)
treea15c9bbb510c36dc5da870660dff9c2869920401 /kernel/crash_dump.c
parent3d214faea6e4f9b6018bf8589f4b245126349c0a (diff)
[S390] kdump: Add size to elfcorehdr kernel parameter
Currently only the address of the pre-allocated ELF header is passed with the elfcorehdr= kernel parameter. In order to reserve memory for the header in the 2nd kernel also the size is required. Current kdump architecture backends use different methods to do that, e.g. x86 uses the memmap= kernel parameter. On s390 there is no easy way to transfer this information. Therefore the elfcorehdr kernel parameter is extended to also pass the size. This now can also be used as standard mechanism by all future kdump architecture backends. The syntax of the kernel parameter is extended as follows: elfcorehdr=[size[KMG]@]offset[KMG] This change is backward compatible because elfcorehdr=size is still allowed. Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'kernel/crash_dump.c')
-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);

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