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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2018-04-19 12:34:06 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2018-05-03 22:32:27 +1000
commit88b1a8547f4c00e55d54e081fc15e3980debf5c1 (patch)
treeef2bec6859a6a8b10db4517ec9d919a119ac7c74 /arch/powerpc
parenta4bc64d305af40446d0ac792bb8a9b2cd20af3d3 (diff)
powerpc64/kexec: Hard disable ftrace before switching to the new kernel
If function_graph tracer is enabled during kexec, we see the below exception in the simulator: root@(none):/# kexec -e kvm: exiting hardware virtualization kexec_core: Starting new kernel [ 19.262020070,5] OPAL: Switch to big-endian OS kexec: Starting switchover sequence. Interrupt to 0xC000000000004380 from 0xC000000000004380 ** Execution stopped: Continuous Interrupt, Instruction caused exception, ** Now that we have a more effective way to completely disable ftrace on ppc64, let's also use that before switching to a new kernel during kexec. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/machine_kexec.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 2694d078741d..936c7e2d421e 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -98,12 +98,14 @@ void machine_kexec(struct kimage *image)
int save_ftrace_enabled;
save_ftrace_enabled = __ftrace_enabled_save();
+ this_cpu_disable_ftrace();
if (ppc_md.machine_kexec)
ppc_md.machine_kexec(image);
else
default_machine_kexec(image);
+ this_cpu_enable_ftrace();
__ftrace_enabled_restore(save_ftrace_enabled);
/* Fall back to normal restart if we're still alive. */