tracing: Change offset type to s32 in preempt/irq tracepoints

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@google.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Antonio Borneo <antonio.borneo@st.com>
Cc: stable@vger.kernel.org
Fixes: d59158162e032 ("tracing: Add support for preempt and irq enable/disable events")
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/trace/events/preemptirq.h b/include/trace/events/preemptirq.h
index 9a0d4ce..ccb37d0 100644 (file)
--- 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=%pF parent=%pF",