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>

diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index 5c8e773..0732adb 100644 (file)
--- 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 17c80fd..9fc6f7c 100644 (file)
--- 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();