[for-next][PATCH 08/24] arm64: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack
From: Steven Rostedt <rostedt@goodmis.org>
Date: 2018-12-21 17:58:26
Also in:
lkml
Subsystem:
arm pmu profiling and debugging, arm64 port (aarch64 architecture), performance events subsystem, the rest · Maintainers:
Will Deacon, Mark Rutland, Catalin Marinas, Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
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: linux-arm-kernel@lists.infradead.org Cc: Will Deacon <redacted> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- arch/arm64/kernel/perf_callchain.c | 2 +- arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/return_address.c | 2 +- arch/arm64/kernel/stacktrace.c | 12 +++++++----- arch/arm64/kernel/time.c | 2 +- arch/arm64/kernel/traps.c | 2 +- 6 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_callchain.c
index bcafd7dcfe8b..1b792b46604e 100644
--- a/arch/arm64/kernel/perf_callchain.c
+++ b/arch/arm64/kernel/perf_callchain.c@@ -164,7 +164,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, frame.fp = regs->regs[29]; frame.pc = regs->pc; #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = current->curr_ret_stack; + frame.graph = 0; #endif walk_stackframe(current, &frame, callchain_trace, entry);
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index d9a4c2d6dd8b..37a66394b07d 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c@@ -459,7 +459,7 @@ unsigned long get_wchan(struct task_struct *p) frame.fp = thread_saved_fp(p); frame.pc = thread_saved_pc(p); #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = p->curr_ret_stack; + frame.graph = 0; #endif do { if (unwind_frame(p, &frame))
diff --git a/arch/arm64/kernel/return_address.c b/arch/arm64/kernel/return_address.c
index 933adbc0f654..53c40196b607 100644
--- a/arch/arm64/kernel/return_address.c
+++ b/arch/arm64/kernel/return_address.c@@ -44,7 +44,7 @@ void *return_address(unsigned int level) frame.fp = (unsigned long)__builtin_frame_address(0); frame.pc = (unsigned long)return_address; /* dummy */ #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = current->curr_ret_stack; + frame.graph = 0; #endif walk_stackframe(current, &frame, save_return_addr, &data);
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 7723dadf25be..1a29f2695ff2 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c@@ -59,15 +59,17 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame) #ifdef CONFIG_FUNCTION_GRAPH_TRACER if (tsk->ret_stack && (frame->pc == (unsigned long)return_to_handler)) { - if (WARN_ON_ONCE(frame->graph == -1)) - return -EINVAL; + struct ftrace_ret_stack *ret_stack; /* * This is a case where function graph tracer has * modified a return address (LR) in a stack frame * to hook a function return. * So replace it to an original value. */ - frame->pc = tsk->ret_stack[frame->graph--].ret; + ret_stack = ftrace_graph_get_ret_stack(tsk, frame->graph++); + if (WARN_ON_ONCE(!ret_stack)) + return -EINVAL; + frame->pc = ret_stack->ret; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
@@ -134,7 +136,7 @@ void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) frame.fp = regs->regs[29]; frame.pc = regs->pc; #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = current->curr_ret_stack; + frame.graph = 0; #endif walk_stackframe(current, &frame, save_trace, &data);
@@ -165,7 +167,7 @@ static noinline void __save_stack_trace(struct task_struct *tsk, frame.pc = (unsigned long)__save_stack_trace; } #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = tsk->curr_ret_stack; + frame.graph = 0; #endif walk_stackframe(tsk, &frame, save_trace, &data);
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
index f258636273c9..a777ae90044d 100644
--- a/arch/arm64/kernel/time.c
+++ b/arch/arm64/kernel/time.c@@ -52,7 +52,7 @@ unsigned long profile_pc(struct pt_regs *regs) frame.fp = regs->regs[29]; frame.pc = regs->pc; #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = current->curr_ret_stack; + frame.graph = 0; #endif do { int ret = unwind_frame(NULL, &frame);
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 5f4d9acb32f5..49ebf3771391 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c@@ -122,7 +122,7 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) frame.pc = thread_saved_pc(tsk); } #ifdef CONFIG_FUNCTION_GRAPH_TRACER - frame.graph = tsk->curr_ret_stack; + frame.graph = 0; #endif skip = !!regs;
--
2.19.2
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