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ftrace: Look up the address of return_to_handler() using helpers 

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
This commit is contained in:
Naveen N. Rao 2019-09-05 23:50:28 +05:30 committed by Michael Ellerman
parent e7ca44ed3b
commit a3db31ff6c
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/fgraph.c
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@ -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;