diff options
| author | Huang Ying <[email protected]> | 2008-08-15 00:40:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2008-08-15 08:35:43 -0700 |
| commit | 3122c331190e9d1622bf1c8cf6ce3b17cca67c9e (patch) | |
| tree | e856b7a59f5ea5ba4f1662cefdae267b26af30dd | |
| parent | 9bdeb7b5d34f197dea7859d24475943395ffea5e (diff) | |
kexec jump: fix for ftrace
Ftrace depends on some processor state that we destroyed during kexec and
restored by restore_processor_state(). So save_processor_state() and
restore_processor_state() are moved into machine_kexec() and ftrace is
restored after restore_processor_state().
Signed-off-by: Huang Ying <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | arch/x86/kernel/machine_kexec_32.c | 16 | ||||
| -rw-r--r-- | kernel/kexec.c | 2 |
2 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c index 5c8e7735c896..0732adba05ca 100644 --- a/arch/x86/kernel/machine_kexec_32.c +++ b/arch/x86/kernel/machine_kexec_32.c @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/numa.h> #include <linux/ftrace.h> +#include <linux/suspend.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -113,6 +114,7 @@ void machine_kexec(struct kimage *image) { unsigned long page_list[PAGES_NR]; void *control_page; + int save_ftrace_enabled; asmlinkage unsigned long (*relocate_kernel_ptr)(unsigned long indirection_page, unsigned long control_page, @@ -120,7 +122,12 @@ void machine_kexec(struct kimage *image) unsigned int has_pae, unsigned int preserve_context); - tracer_disable(); +#ifdef CONFIG_KEXEC_JUMP + if (kexec_image->preserve_context) + save_processor_state(); +#endif + + save_ftrace_enabled = __ftrace_enabled_save(); /* Interrupts aren't acceptable while we reboot */ local_irq_disable(); @@ -178,6 +185,13 @@ void machine_kexec(struct kimage *image) (unsigned long)page_list, image->start, cpu_has_pae, image->preserve_context); + +#ifdef CONFIG_KEXEC_JUMP + if (kexec_image->preserve_context) + restore_processor_state(); +#endif + + __ftrace_enabled_restore(save_ftrace_enabled); } void arch_crash_save_vmcoreinfo(void) diff --git a/kernel/kexec.c b/kernel/kexec.c index 17c80fdc453b..9fc6f7cbd8a8 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1469,7 +1469,6 @@ int kernel_kexec(void) error = device_power_down(PMSG_FREEZE); if (error) goto Enable_irqs; - save_processor_state(); } else #endif { @@ -1482,7 +1481,6 @@ int kernel_kexec(void) #ifdef CONFIG_KEXEC_JUMP if (kexec_image->preserve_context) { - restore_processor_state(); device_power_up(PMSG_RESTORE); Enable_irqs: local_irq_enable(); |