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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 <ying.huang@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Huang Ying 2008-08-15 00:40:26 -07:00 committed by Linus Torvalds
parent 9bdeb7b5d3
commit 3122c33119
2 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/x86/kernel/machine_kexec_32.c
View File

@ -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)

2
kernel/kexec.c
View File

@ -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();