tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all}

commit 45dd9b0666a162f8e4be76096716670cf1741f0e upstream.

Doing an audit of trace events, I discovered two trace events in the xen
subsystem that use a hack to create zero data size trace events. This is not
what trace events are for. Trace events add memory footprint overhead, and
if all you need to do is see if a function is hit or not, simply make that
function noinline and use function tracer filtering.

Worse yet, the hack used was:

 __array(char, x, 0)

Which creates a static string of zero in length. There's assumptions about
such constructs in ftrace that this is a dynamic string that is nul
terminated. This is not the case with these tracepoints and can cause
problems in various parts of ftrace.

Nuke the trace events!

Link: http://lkml.kernel.org/r/20180509144605.5a220327@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 95a7d76897c1e ("xen/mmu: Use Xen specific TLB flush instead of the generic one.")
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 418f1b8576cf3d7554f5ac2b2096d989a581f96d..c92f75f7ae334f98b3bba8e8dacea85724664b54 100644 (file)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1317,8 +1317,6 @@ void xen_flush_tlb_all(void)
        struct mmuext_op *op;
        struct multicall_space mcs;
 
-       trace_xen_mmu_flush_tlb_all(0);
-
        preempt_disable();
 
        mcs = xen_mc_entry(sizeof(*op));
@@ -1336,8 +1334,6 @@ static void xen_flush_tlb(void)
        struct mmuext_op *op;
        struct multicall_space mcs;
 
-       trace_xen_mmu_flush_tlb(0);
-
        preempt_disable();
 
        mcs = xen_mc_entry(sizeof(*op));

diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
index bce990f5a35d77615bb536009940f6146d1e7d82..d6be935caa501f9f260ef0e86d9dc603801a7042 100644 (file)
--- a/include/trace/events/xen.h
+++ b/include/trace/events/xen.h
@@ -377,22 +377,6 @@ DECLARE_EVENT_CLASS(xen_mmu_pgd,
 DEFINE_XEN_MMU_PGD_EVENT(xen_mmu_pgd_pin);
 DEFINE_XEN_MMU_PGD_EVENT(xen_mmu_pgd_unpin);
 
-TRACE_EVENT(xen_mmu_flush_tlb_all,
-           TP_PROTO(int x),
-           TP_ARGS(x),
-           TP_STRUCT__entry(__array(char, x, 0)),
-           TP_fast_assign((void)x),
-           TP_printk("%s", "")
-       );
-
-TRACE_EVENT(xen_mmu_flush_tlb,
-           TP_PROTO(int x),
-           TP_ARGS(x),
-           TP_STRUCT__entry(__array(char, x, 0)),
-           TP_fast_assign((void)x),
-           TP_printk("%s", "")
-       );
-
 TRACE_EVENT(xen_mmu_flush_tlb_single,
            TP_PROTO(unsigned long addr),
            TP_ARGS(addr),