From: Steven Rostedt Date: Fri, 21 Dec 2018 17:56:25 +0000 Subject: [for-next][PATCH 07/24] sh: ftrace: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack Message-Id: <20181221175656.345267788@goodmis.org> List-Id: References: <20181221175618.968519903@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Namhyung Kim , Masami Hiramatsu , linux-sh@vger.kernel.org, Yoshinori Sato , Rich Felker From: "Steven Rostedt (VMware)" 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: linux-sh@vger.kernel.org Cc: Yoshinori Sato Cc: Rich Felker Signed-off-by: Steven Rostedt (VMware) --- arch/sh/kernel/dumpstack.c | 11 +++++++---- arch/sh/kernel/dwarf.c | 9 +++++---- 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/arch/sh/kernel/dumpstack.c b/arch/sh/kernel/dumpstack.c index b564b1eae4ae..2c2e151bf39e 100644 --- a/arch/sh/kernel/dumpstack.c +++ b/arch/sh/kernel/dumpstack.c @@ -59,17 +59,20 @@ print_ftrace_graph_addr(unsigned long addr, void *data, struct thread_info *tinfo, int *graph) { struct task_struct *task = tinfo->task; + struct ftrace_ret_stack *ret_stack; unsigned long ret_addr; - int index = task->curr_ret_stack; if (addr != (unsigned long)return_to_handler) return; - if (!task->ret_stack || index < *graph) + if (!task->ret_stack) return; - index -= *graph; - ret_addr = task->ret_stack[index].ret; + ret_stack = ftrace_graph_get_ret_stack(task, *graph); + if (!ret_stack) + return; + + ret_addr = ret_stack->ret; ops->address(data, ret_addr, 1); diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c index bb511e2d9d68..df0fd6efe758 100644 --- a/arch/sh/kernel/dwarf.c +++ b/arch/sh/kernel/dwarf.c @@ -608,17 +608,18 @@ struct dwarf_frame *dwarf_unwind_stack(unsigned long pc, * expected to find the real return address. */ if (pc = (unsigned long)&return_to_handler) { - int index = current->curr_ret_stack; + struct ftrace_ret_stack *ret_stack; + ret_stack = ftrace_graph_get_ret_stack(current, 0); + if (ret_stack) + pc = ret_stack->ret; /* * We currently have no way of tracking how many * return_to_handler()'s we've seen. If there is more * than one patched return address on our stack, * complain loudly. */ - WARN_ON(index > 0); - - pc = current->ret_stack[index].ret; + WARN_ON(ftrace_graph_get_ret_stack(current, 1); } #endif -- 2.19.2