Real-Time Preemption, fixed kexec kernel relocation oops
PATCH 1/1 Real-Time Preemption, fixed kexec kernel relocation oops
This patch, built against kernel version 2.6.13-rc7 (and not against -RT tree patch, sorry), fixes a few local_irq_disable() calls which leads to an oops during kernel relocation in kexec subsystem. Currently, only i386 implementation of kexec is fixed.
Anyway, this patch does not fix a strange behaviour when using kexec with a -RT kernel. Here is dmesg output:
Uncompressing Linux... OK, booting the kernel.
Unknown interrupt or fault at EIP 00000203 00000060 c011dfe3 Linux version 2.6.13-rc7-rt1 (root@sauron) (gcc version 3.3.4 (Debian 1:3.3.4-13)) #2 Fri Aug 26 16:55:12 UTC 2005
[...]
hda: lost interrupt
hda: lost interrupt
hda: lost interrupt
[...]
System is very slow and there are tons of "lost interrupt" messages.
arch/i386/kernel/machine_kexec.c renamed from arch/i386/kernel/machine_kexec.c.orig +1 -1
@@ -187,7 +187,7 @@ NORET_TYPE void machine_kexec(struct kimrelocate_new_kernel_t rnk;/* Interrupts aren't acceptable while we reboot */ -local_irq_disable (); +raw_local_irq_disable ();/* Compute some offsets */ reboot_code_buffer =page_to_pfn (image->control_code_page)
arch/i386/kernel/crash.c renamed from arch/i386/kernel/crash.c.orig +2 -2
@@ -143,7 +143,7 @@ static int crash_nmi_callback(struct pt_*/ if (cpu == crashing_cpu)return 1 ; -local_irq_disable (); +raw_local_irq_disable ();if (!user_mode (regs)) {crash_setup_regs (&fixed_regs, regs);
@@ -210,7 +210,7 @@ void machine_crash_shutdown(struct pt_re* an SMP system. */ /* The kernel is broken so disable interrupts */ -local_irq_disable (); +raw_local_irq_disable ();/* Make a note of crashing cpu. Will be used in NMI callback.*/ crashing_cpu =smp_processor_id ();
Regards,
Signature · 1 line
Luca