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Date: Tue, 12 Aug 2008 11:14:37 +0800 From: Huang Ying <ying.huang@...el.com> To: "Eric W. Biederman" <ebiederm@...ssion.com>, Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>, Andrew Morton <akpm@...ux-foundation.org>, Vivek Goyal <vgoyal@...hat.com>, mingo@...e.hu, Linus Torvalds <torvalds@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, Kexec Mailing List <kexec@...ts.infradead.org> Subject: [PATCH -v3 7/7] 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@...el.com> --- arch/x86/kernel/machine_kexec_32.c | 16 +++++++++++++++- kernel/kexec.c | 2 -- 2 files changed, 15 insertions(+), 3 deletions(-) --- 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) --- 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(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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