linux-kernel - [RFC PATCH 6/6] powerpc/stacktrace: Include ftraced function in arch_stack

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Date:   Fri, 21 May 2021 12:18:41 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Suchanek <msuchanek@...e.de>,
        Torsten Duwe <duwe@...e.de>
Cc:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 6/6] powerpc/stacktrace: Include ftraced function in arch_stack_walk()

With -mprofile-kernel and ppc32, the function tracer is invoked before a
function sets up its own stackframe. This results in the traced function
not appearing in stack traces. Fix this by checking for ftrace entry and
including the traced function in the stack trace.

Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/stacktrace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index 1e1be297c5d6c7..f884c5d21fa7e7 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -51,6 +51,10 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
 		if (!consume_entry(cookie, ip))
 			return;
 
+		ip = ftrace_get_traced_func_if_no_stackframe(ip, stack);
+		if (ip && !consume_entry(cookie, ip))
+			return;
+
 		sp = newsp;
 	}
 }
-- 
2.30.2