On 2/3/21 7:07 PM, Jinyang He wrote:
> "elfcorehdr" can be parsed at kernel/crash_dump.c
>
> Signed-off-by: Jinyang He <hejinyang@xxxxxxxxxxx>
Hm, looks like that would require CONFIG_CRASH_DUMP?
> ---
> arch/mips/kernel/setup.c | 49 +++++++++++++++++++++---------------------------
> 1 file changed, 21 insertions(+), 28 deletions(-)
>
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index 7e1f8e2..4d2f915 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -29,6 +29,7 @@
> #include <linux/of_fdt.h>
> #include <linux/of_reserved_mem.h>
> #include <linux/dmi.h>
> +#include <linux/crash_dump.h>
>
> #include <asm/addrspace.h>
> #include <asm/bootinfo.h>
> @@ -404,34 +405,32 @@ static int __init early_parse_memmap(char *p)
> }
> early_param("memmap", early_parse_memmap);
>
> -#ifdef CONFIG_PROC_VMCORE
> -static unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
> -static int __init early_parse_elfcorehdr(char *p)
> +static void __init mips_reserve_vmcore(void)
> {
> +#ifdef CONFIG_PROC_VMCORE
> phys_addr_t start, end;
> u64 i;
>
> - setup_elfcorehdr = memparse(p, &p);
> -
> - for_each_mem_range(i, &start, &end) {
> - if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
> - /*
> - * Reserve from the elf core header to the end of
> - * the memory segment, that should all be kdump
> - * reserved memory.
> - */
> - setup_elfcorehdr_size = end - setup_elfcorehdr;
> - break;
> + if (!elfcorehdr_size) {
> + for_each_mem_range(i, &start, &end) {
> + if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
> + /*
> + * Reserve from the elf core header to the end of
> + * the memory segment, that should all be kdump
> + * reserved memory.
> + */
> + elfcorehdr_size = end - elfcorehdr_addr;
> + break;
> + }
> }
> }
> - /*
> - * If we don't find it in the memory map, then we shouldn't
> - * have to worry about it, as the new kernel won't use it.
> - */
> - return 0;
> -}
> -early_param("elfcorehdr", early_parse_elfcorehdr);
> +
> + pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
> + (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
> +
> + memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
> #endif
> +}
>
> #ifdef CONFIG_KEXEC
>
> @@ -653,13 +652,7 @@ static void __init arch_mem_init(char **cmdline_p)
> */
> memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>
> -#ifdef CONFIG_PROC_VMCORE
> - if (setup_elfcorehdr && setup_elfcorehdr_size) {
> - printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
> - setup_elfcorehdr, setup_elfcorehdr_size);
> - memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
> - }
> -#endif
> + mips_reserve_vmcore();
>
> mips_parse_crashkernel();
> #ifdef CONFIG_KEXEC
>
--
~Randy
