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authorAlexander Nyberg <alexn@telia.com>2005-06-25 14:58:26 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:54 -0700
commit6e274d144302068a00794ec22e73520c0615cb6f (patch)
treef7ea59ea47d3c5676fbac8d39e8deaa1f94146ae /include
parent86b1ae38c0a62409dc862a28e3f08920f55f944b (diff)
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[PATCH] kdump: Use real pt_regs from exception
Makes kexec_crashdump() take a pt_regs * as an argument. This allows to get exact register state at the point of the crash. If we come from direct panic assertion NULL will be passed and the current registers saved before crashdump. This hooks into two places: die(): check the conditions under which we will panic when calling do_exit and go there directly with the pt_regs that caused the fatal fault. die_nmi(): If we receive an NMI lockup while in the kernel use the pt_regs and go directly to crash_kexec(). We're probably nested up badly at this point so this might be the only chance to escape with proper information. Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kexec.h8
-rw-r--r--include/linux/reboot.h3
2 files changed, 8 insertions, 3 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0653a27c3d7..7383173a3a9 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -99,7 +99,8 @@ extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
unsigned long flags);
#endif
extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order);
-extern void crash_kexec(void);
+extern void crash_kexec(struct pt_regs *);
+int kexec_should_crash(struct task_struct *);
extern struct kimage *kexec_image;
#define KEXEC_ON_CRASH 0x00000001
@@ -123,6 +124,9 @@ extern struct kimage *kexec_image;
extern struct resource crashk_res;
#else /* !CONFIG_KEXEC */
-static inline void crash_kexec(void) { }
+struct pt_regs;
+struct task_struct;
+static inline void crash_kexec(struct pt_regs *regs) { }
+static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#endif /* CONFIG_KEXEC */
#endif /* LINUX_KEXEC_H */
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index c5a05e16edb..2d4dd23168d 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -52,7 +52,8 @@ extern void machine_halt(void);
extern void machine_power_off(void);
extern void machine_shutdown(void);
-extern void machine_crash_shutdown(void);
+struct pt_regs;
+extern void machine_crash_shutdown(struct pt_regs *);
#endif