#ifndef LINUX_CRASH_DUMP_H#define LINUX_CRASH_DUMP_H #ifdef CONFIG_CRASH_DUMP#include <linux/kexec.h>#include <linux/device.h>#include <linux/proc_fs.h> #define ELFCORE_ADDR_MAX	(-1ULL)#define ELFCORE_ADDR_ERR	(-2ULL) extern unsigned long long elfcorehdr_addr; extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,						unsigned long, int); /* Architecture code defines this if there are other possible ELF * machine types, e.g. on bi-arch capable hardware. */#ifndef vmcore_elf_check_arch_cross#define vmcore_elf_check_arch_cross(x) 0#endif #define vmcore_elf_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) /* * is_kdump_kernel() checks whether this kernel is booting after a panic of * previous kernel or not. This is determined by checking if previous kernel * has passed the elf core header address on command line. * * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of * previous kernel. */ static inline int is_kdump_kernel(void){	return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;} /* is_vmcore_usable() checks if the kernel is booting after a panic and * the vmcore region is usable. * * This makes use of the fact that due to alignment -2ULL is not * a valid pointer, much in the vain of IS_ERR(), except * dealing directly with an unsigned long long rather than a pointer. */ static inline int is_vmcore_usable(void){	return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;} /* vmcore_unusable() marks the vmcore as unusable, * without disturbing the logic of is_kdump_kernel() */ static inline void vmcore_unusable(void){	if (is_kdump_kernel())		elfcorehdr_addr = ELFCORE_ADDR_ERR;}#else /* !CONFIG_CRASH_DUMP */static inline int is_kdump_kernel(void) { return 0; }#endif /* CONFIG_CRASH_DUMP */ extern unsigned long saved_max_pfn;#endif /* LINUX_CRASHDUMP_H */