From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
linux-arch@vger.kernel.org,
Joel Fernandes <joel@joelfernandes.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
"James E.J. Bottomley" <jejb@parisc-linux.org>,
Helge Deller <deller@gmx.de>,
linux-parisc@vger.kernel.org, stable@kernel.org
Subject: [for-next][PATCH 08/18] parisc: function_graph: Simplify with function_graph_entry()
Date: Wed, 21 Nov 2018 19:28:09 -0500 [thread overview]
Message-ID: <20181122003332.500796758@goodmis.org> (raw)
In-Reply-To: 20181122002801.501220343@goodmis.org
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
The function_graph_entry() function does the work of calling the function
graph hook function and the management of the shadow stack, simplifying the
work done in the architecture dependent prepare_ftrace_return().
Have parisc use the new code, and remove the shadow stack management as well as
having to set up the trace structure.
This is needed to prepare for a fix of a design bug on how the curr_ret_stack
is used.
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Cc: stable@kernel.org
Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/parisc/kernel/ftrace.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index 6fa8535d3cce..e46a4157a894 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -30,7 +30,6 @@ static void __hot prepare_ftrace_return(unsigned long *parent,
unsigned long self_addr)
{
unsigned long old;
- struct ftrace_graph_ent trace;
extern int parisc_return_to_handler;
if (unlikely(ftrace_graph_is_dead()))
@@ -41,19 +40,9 @@ static void __hot prepare_ftrace_return(unsigned long *parent,
old = *parent;
- trace.func = self_addr;
- trace.depth = current->curr_ret_stack + 1;
-
- /* Only trace if the calling function expects to */
- if (!ftrace_graph_entry(&trace))
- return;
-
- if (ftrace_push_return_trace(old, self_addr, &trace.depth,
- 0, NULL) == -EBUSY)
- return;
-
- /* activate parisc_return_to_handler() as return point */
- *parent = (unsigned long) &parisc_return_to_handler;
+ if (!function_graph_enter(old, self_addr, 0, NULL))
+ /* activate parisc_return_to_handler() as return point */
+ *parent = (unsigned long) &parisc_return_to_handler;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
--
2.19.1
next prev parent reply other threads:[~2018-11-22 0:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-22 0:28 [for-next][PATCH 00/18] function_graph: Add separate depth counter to prevent trace corruption Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 01/18] function_graph: Create function_graph_enter() to consolidate architecture code Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 02/18] x86/function_graph: Simplify with function_graph_entry() Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 03/18] ARM: function_graph: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 04/18] arm64: " Steven Rostedt
2018-11-27 18:07 ` Will Deacon
2018-11-27 18:26 ` Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 05/18] microblaze: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 06/18] MIPS: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 07/18] nds32: " Steven Rostedt
2018-11-22 0:28 ` Steven Rostedt [this message]
[not found] ` <20181123073033.2083020863@mail.kernel.org>
2018-11-23 9:06 ` [for-next][PATCH 08/18] parisc: " Helge Deller
2018-11-23 17:12 ` Steven Rostedt
2018-11-23 18:34 ` Sasha Levin
2018-11-23 19:26 ` Steven Rostedt
2018-11-23 20:00 ` Sasha Levin
2018-11-24 18:46 ` Steven Rostedt
2018-12-03 14:54 ` Sasha Levin
2018-11-22 0:28 ` [for-next][PATCH 09/18] powerpc/function_graph: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 10/18] riscv/function_graph: " Steven Rostedt
2018-11-26 16:47 ` Palmer Dabbelt
2018-11-22 0:28 ` [for-next][PATCH 11/18] s390/function_graph: " Steven Rostedt
2018-11-22 6:43 ` Martin Schwidefsky
2018-11-23 17:15 ` Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 12/18] sh/function_graph: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 13/18] sparc/function_graph: " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 14/18] function_graph: Make ftrace_push_return_trace() static Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 15/18] function_graph: Use new curr_ret_depth to manage depth instead of curr_ret_stack Steven Rostedt
2018-11-22 10:03 ` Peter Zijlstra
2018-11-23 14:14 ` Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 16/18] function_graph: Move return callback before update " Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 17/18] function_graph: Reverse the order of pushing the ret_stack and the callback Steven Rostedt
2018-11-22 0:28 ` [for-next][PATCH 18/18] function_graph: Have profiler use curr_ret_stack and not depth Steven Rostedt
2018-11-26 5:15 ` [for-next][PATCH 00/18] function_graph: Add separate depth counter to prevent trace corruption Masami Hiramatsu
2018-11-28 20:39 ` Joe Lawrence
2018-11-28 21:00 ` Steven Rostedt
2018-11-29 3:29 ` Steven Rostedt
2018-11-29 4:24 ` Steven Rostedt
2018-11-29 15:08 ` Joe Lawrence
2018-11-29 16:17 ` Steven Rostedt
2018-11-29 16:32 ` Joe Lawrence
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