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ftrace: Look up the address of return_to_handler() using helpers
author
Naveen N. Rao
<naveen.n.rao@linux.vnet.ibm.com>
Thu, 5 Sep 2019 18:20:28 +0000
(23:50 +0530)
committer
Michael Ellerman
<mpe@ellerman.id.au>
Wed, 18 Sep 2019 02:24:47 +0000
(12:24 +1000)
This ensures that we use the right address on architectures that use
function descriptors.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link:
https://lore.kernel.org/r/8f6f14d192a994008ac370ce14036bbe67224c7d.1567707399.git.naveen.n.rao@linux.vnet.ibm.com
kernel/trace/fgraph.c
patch
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diff --git
a/kernel/trace/fgraph.c
b/kernel/trace/fgraph.c
index 8dfd5021b9339ac2c5369607528fdadc4f8f64d1..7950a0356042a3f71026298dd4de563cd5180d4c 100644
(file)
--- a/
kernel/trace/fgraph.c
+++ b/
kernel/trace/fgraph.c
@@
-276,7
+276,7
@@
unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
int index = task->curr_ret_stack;
int i;
- if (ret != (unsigned long)
return_to_handler
)
+ if (ret != (unsigned long)
dereference_kernel_function_descriptor(return_to_handler)
)
return ret;
if (index < 0)
@@
-294,7
+294,7
@@
unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
{
int task_idx;
- if (ret != (unsigned long)
return_to_handler
)
+ if (ret != (unsigned long)
dereference_kernel_function_descriptor(return_to_handler)
)
return ret;
task_idx = task->curr_ret_stack;