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authorHuang Ying <ying.huang@intel.com>2008-08-15 03:40:26 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-15 11:35:43 -0400
commit3122c331190e9d1622bf1c8cf6ce3b17cca67c9e (patch)
treee856b7a59f5ea5ba4f1662cefdae267b26af30dd /arch/x86/kernel/machine_kexec_32.c
parent9bdeb7b5d34f197dea7859d24475943395ffea5e (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 <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>
Diffstat (limited to 'arch/x86/kernel/machine_kexec_32.c')
-rw-r--r--arch/x86/kernel/machine_kexec_32.c16
1 files changed, 15 insertions, 1 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 @@
12#include <linux/init.h> 12#include <linux/init.h>
13#include <linux/numa.h> 13#include <linux/numa.h>
14#include <linux/ftrace.h> 14#include <linux/ftrace.h>
15#include <linux/suspend.h>
15 16
16#include <asm/pgtable.h> 17#include <asm/pgtable.h>
17#include <asm/pgalloc.h> 18#include <asm/pgalloc.h>
@@ -113,6 +114,7 @@ void machine_kexec(struct kimage *image)
113{ 114{
114 unsigned long page_list[PAGES_NR]; 115 unsigned long page_list[PAGES_NR];
115 void *control_page; 116 void *control_page;
117 int save_ftrace_enabled;
116 asmlinkage unsigned long 118 asmlinkage unsigned long
117 (*relocate_kernel_ptr)(unsigned long indirection_page, 119 (*relocate_kernel_ptr)(unsigned long indirection_page,
118 unsigned long control_page, 120 unsigned long control_page,
@@ -120,7 +122,12 @@ void machine_kexec(struct kimage *image)
120 unsigned int has_pae, 122 unsigned int has_pae,
121 unsigned int preserve_context); 123 unsigned int preserve_context);
122 124
123 tracer_disable(); 125#ifdef CONFIG_KEXEC_JUMP
126 if (kexec_image->preserve_context)
127 save_processor_state();
128#endif
129
130 save_ftrace_enabled = __ftrace_enabled_save();
124 131
125 /* Interrupts aren't acceptable while we reboot */ 132 /* Interrupts aren't acceptable while we reboot */
126 local_irq_disable(); 133 local_irq_disable();
@@ -178,6 +185,13 @@ void machine_kexec(struct kimage *image)
178 (unsigned long)page_list, 185 (unsigned long)page_list,
179 image->start, cpu_has_pae, 186 image->start, cpu_has_pae,
180 image->preserve_context); 187 image->preserve_context);
188
189#ifdef CONFIG_KEXEC_JUMP
190 if (kexec_image->preserve_context)
191 restore_processor_state();
192#endif
193
194 __ftrace_enabled_restore(save_ftrace_enabled);
181} 195}
182 196
183void arch_crash_save_vmcoreinfo(void) 197void arch_crash_save_vmcoreinfo(void)