linux-kernel - [PATCH 5.4 16/78] tracing: Change offset type to s32 in preempt/irq tracepoints

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Date:   Tue, 14 Jan 2020 11:00:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        David Sterba <dsterba@...e.com>,
        Ingo Molnar <mingo@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Antonio Borneo <antonio.borneo@...com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 5.4 16/78] tracing: Change offset type to s32 in preempt/irq tracepoints

From: Joel Fernandes (Google) <joel@...lfernandes.org>

commit bf44f488e168368cae4139b4b33c3d0aaa11679c upstream.

Discussion in the below link reported that symbols in modules can appear
to be before _stext on ARM architecture, causing wrapping with the
offsets of this tracepoint. Change the offset type to s32 to fix this.

Link: http://lore.kernel.org/r/20191127154428.191095-1-antonio.borneo@st.com
Link: http://lkml.kernel.org/r/20200102194625.226436-1-joel@joelfernandes.org

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: David Sterba <dsterba@...e.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Antonio Borneo <antonio.borneo@...com>
Cc: stable@...r.kernel.org
Fixes: d59158162e032 ("tracing: Add support for preempt and irq enable/disable events")
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/trace/events/preemptirq.h |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/include/trace/events/preemptirq.h
+++ b/include/trace/events/preemptirq.h
@@ -18,13 +18,13 @@ DECLARE_EVENT_CLASS(preemptirq_template,
 	TP_ARGS(ip, parent_ip),

 	TP_STRUCT__entry(
-		__field(u32, caller_offs)
-		__field(u32, parent_offs)
+		__field(s32, caller_offs)
+		__field(s32, parent_offs)
 	),

 	TP_fast_assign(
-		__entry->caller_offs = (u32)(ip - (unsigned long)_stext);
-		__entry->parent_offs = (u32)(parent_ip - (unsigned long)_stext);
+		__entry->caller_offs = (s32)(ip - (unsigned long)_stext);
+		__entry->parent_offs = (s32)(parent_ip - (unsigned long)_stext);
 	),

 	TP_printk("caller=%pS parent=%pS",