[PATCH 8/8] powerpc/xmon: Disable function_graph tracing while in xmon
From: Naveen N. Rao <hidden>
Date: 2017-05-04 04:38:03
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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 <redacted> --- 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