Hi folks, I'm trying to add pmem's metadata(located at pmem device) to /proc/vmcore. To accomplish this, I think something i need to know is where the contents of /proc/vmcore come from, and then append something into it. I have read https://opensource.com/article/17/6/kdump-usage-and-internals, and knew /proc/vmcore is a elf file. It mentioned that "Creates /proc/vmcore as per elfcorehdr information received", but i don't get how it elfcorehdr(maybe elfcorehdr_addr) be assigned in 2nd kernel. I tried to grep it in the kernel source, but still no answer. So i deep hope you guys can give me some hints or answer. and thank you in advance :) [root@iaas-rpma linux]# git grep elfcorehdr_addr | grep -v -w -e ia64 -e loongarch -e mips -e powerpc -e riscv arch/s390/kernel/setup.c: elfcorehdr_addr = ELFCORE_ADDR_MAX; drivers/of/fdt.c: if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) { drivers/of/fdt.c: memblock_reserve(elfcorehdr_addr, elfcorehdr_size); drivers/of/fdt.c: elfcorehdr_size >> 10, elfcorehdr_addr); drivers/of/fdt.c: elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, &prop); drivers/of/fdt.c: elfcorehdr_addr, elfcorehdr_size); fs/proc/vmcore.c: addr = elfcorehdr_addr; fs/proc/vmcore.c: addr = elfcorehdr_addr; fs/proc/vmcore.c: addr = elfcorehdr_addr; fs/proc/vmcore.c: addr = elfcorehdr_addr; fs/proc/vmcore.c: addr = elfcorehdr_addr; fs/proc/vmcore.c: rc = elfcorehdr_alloc(&elfcorehdr_addr, &elfcorehdr_size); fs/proc/vmcore.c: elfcorehdr_free(elfcorehdr_addr); fs/proc/vmcore.c: elfcorehdr_addr = ELFCORE_ADDR_ERR; include/linux/crash_dump.h:extern unsigned long long elfcorehdr_addr; include/linux/crash_dump.h: return elfcorehdr_addr != ELFCORE_ADDR_MAX; include/linux/crash_dump.h: return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; include/linux/crash_dump.h: elfcorehdr_addr = ELFCORE_ADDR_ERR; kernel/crash_dump.c: * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by kernel/crash_dump.c:unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; kernel/crash_dump.c:EXPORT_SYMBOL_GPL(elfcorehdr_addr); kernel/crash_dump.c: elfcorehdr_addr = memparse(arg, &end); kernel/crash_dump.c: elfcorehdr_size = elfcorehdr_addr; kernel/crash_dump.c: elfcorehdr_addr = memparse(end + 1, &end); Thanks Zhijian _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
