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powerpc/kdump: Disable ftrace during kexec 

We should disable ftrace during kexec, some of the tracers are very invasive
and we do not want them going off while doing the low level work of swapping
one kernel out for another. This mirrors what we do on x86.

Even though we cannot return from a kexec on powerpc (since we do not implement
CONFIG_KEXEC_JUMP), add the restore code in case we do one day.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-01-06 18:00:36 +00:00 committed by Benjamin Herrenschmidt
parent 158d5b5e36
commit ac4414e4d3
1 changed files with 7 additions and 0 deletions
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7
arch/powerpc/kernel/machine_kexec.c
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@ -15,6 +15,7 @@
#include <linux/memblock.h> #include <linux/memblock.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/irq.h> #include <linux/irq.h>
#include <linux/ftrace.h>
#include <asm/machdep.h> #include <asm/machdep.h>
#include <asm/prom.h> #include <asm/prom.h>
@ -82,8 +83,14 @@ void arch_crash_save_vmcoreinfo(void)
*/ */
void machine_kexec(struct kimage *image) void machine_kexec(struct kimage *image)
{ {
int save_ftrace_enabled;
save_ftrace_enabled = __ftrace_enabled_save();
default_machine_kexec(image); default_machine_kexec(image);
__ftrace_enabled_restore(save_ftrace_enabled);
/* Fall back to normal restart if we're still alive. */ /* Fall back to normal restart if we're still alive. */
machine_restart(NULL); machine_restart(NULL);
for(;;); for(;;);