HAVE_FUNCTION_GRAPH_FP_TEST reveals another area (apart from jprobes)
that conflicts with the function_graph tracer: xmon. This is due to the
use of longjmp() in various places in xmon.
To address this, pause function_graph tracing while in xmon.
Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
arch/powerpc/xmon/xmon.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index da5619847517..22db68347ff6 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -28,6 +28,7 @@
#include <linux/bug.h>
#include <linux/nmi.h>
#include <linux/ctype.h>
+#include <linux/ftrace.h>
#include <asm/debugfs.h>
#include <asm/ptrace.h>
@@ -459,6 +460,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
local_irq_save(flags);
hard_irq_disable();
+ pause_graph_tracing();
bp = in_breakpoint_table(regs->nip, &offset);
if (bp != NULL) {
@@ -655,6 +657,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
touch_nmi_watchdog();
local_irq_restore(flags);
+ unpause_graph_tracing();
return cmd != 'X' && cmd != EOF;
}
--
2.12.2
