[for-next][PATCH 06/24] sparc64: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack

Steven Rostedt
2018-12-21T17:57:08Z

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The structure of the ret_stack array on the task struct is going to
change, and accessing it directly via the curr_ret_stack index will no
longer give the ret_stack entry that holds the return address. To access
that, architectures must now use ftrace_graph_get_ret_stack() to get the
associated ret_stack that matches the saved return address.

Cc: sparclinux@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/sparc/kernel/perf_event.c | 8 +++++---
arch/sparc/kernel/stacktrace.c | 8 +++++---
arch/sparc/kernel/traps_64.c | 7 ++++---
3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 47c871394ccb..6de7c684c29f 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1767,9 +1767,11 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
perf_callchain_store(entry, pc);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if ((pc + 8UL) == (unsigned long) &return_to_handler) {
- int index = current->curr_ret_stack;
- if (current->ret_stack && index >= graph) {
- pc = current->ret_stack[index - graph].ret;
+ struct ftrace_ret_stack *ret_stack;
+ ret_stack = ftrace_graph_get_ret_stack(current,
+ graph);
+ if (ret_stack) {
+ pc = ret_stack->ret;
perf_callchain_store(entry, pc);
graph++;
}
diff --git a/arch/sparc/kernel/stacktrace.c b/arch/sparc/kernel/stacktrace.c
index be4c14cccc05..dd654e651500 100644
--- a/arch/sparc/kernel/stacktrace.c
+++ b/arch/sparc/kernel/stacktrace.c
@@ -57,9 +57,11 @@ static void __save_stack_trace(struct thread_info *tp,
trace->entries[trace->nr_entries++] = pc;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if ((pc + 8UL) == (unsigned long) &return_to_handler) {
- int index = t->curr_ret_stack;
- if (t->ret_stack && index >= graph) {
- pc = t->ret_stack[index - graph].ret;
+ struct ftrace_ret_stack *ret_stack;
+ ret_stack = ftrace_graph_get_ret_stack(t,
+ graph);
+ if (ret_stack) {
+ pc = ret_stack->ret;
if (trace->nr_entries <
trace->max_entries)
trace->entries[trace->nr_entries++] = pc;
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index aa624ed79db1..0cd02a64a451 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2502,9 +2502,10 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
printk(" [%016lx] %pS\n", pc, (void *) pc);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if ((pc + 8UL) == (unsigned long) &return_to_handler) {
- int index = tsk->curr_ret_stack;
- if (tsk->ret_stack && index >= graph) {
- pc = tsk->ret_stack[index - graph].ret;
+ struct ftrace_ret_stack *ret_stack;
+ ret_stack = ftrace_graph_get_ret_stack(tsk, graph);
+ if (ret_stack) {
+ pc = ret_stack->ret;
printk(" [%016lx] %pS\n", pc, (void *) pc);
graph++;
}
--
2.19.2