mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 08:04:13 +08:00
b3292e88e3
In order to make is_kdump_kernel() accessible from modules, need to make elfcorehdr_addr exported. This was rejected in the past [1] because reset_devices was prefered in that context (reseting the device in kdump kernel), but now there are some network drivers that need to reduce memory usage when loaded from a kdump kernel. And in that context, is_kdump_kernel() suits better. [1] - https://lkml.org/lkml/2011/1/27/341 CC: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/export.h>
|
|
|
|
/*
|
|
* If we have booted due to a crash, max_pfn will be a very low value. We need
|
|
* to know the amount of memory that the previous kernel used.
|
|
*/
|
|
unsigned long saved_max_pfn;
|
|
|
|
/*
|
|
* stores the physical address of elf header of crash image
|
|
*
|
|
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
|
|
* is_kdump_kernel() to determine if we are booting after a panic. Hence put
|
|
* it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
|
|
*/
|
|
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
|
|
EXPORT_SYMBOL_GPL(elfcorehdr_addr);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
char *end;
|
|
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);
|