From: Zhengjun Xing zhengjun.xing@linux.intel.com
[ Upstream commit 9fa8c9c647be624e91b09ecffa7cd97ee0600b40 ]
In the format of synthetic events, the "gfp_t" is shown as "signed:1", but in fact the "gfp_t" is "unsigned", should be shown as "signed:0".
The issue can be reproduced by the following commands:
echo 'memlatency u64 lat; unsigned int order; gfp_t gfp_flags; int migratetype' > /sys/kernel/debug/tracing/synthetic_events cat /sys/kernel/debug/tracing/events/synthetic/memlatency/format
name: memlatency ID: 2233 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;
field:u64 lat; offset:8; size:8; signed:0; field:unsigned int order; offset:16; size:4; signed:0; field:gfp_t gfp_flags; offset:24; size:4; signed:1; field:int migratetype; offset:32; size:4; signed:1;
print fmt: "lat=%llu, order=%u, gfp_flags=%x, migratetype=%d", REC->lat, REC->order, REC->gfp_flags, REC->migratetype
Link: http://lkml.kernel.org/r/20191018012034.6404-1-zhengjun.xing@linux.intel.com
Reviewed-by: Tom Zanussi tom.zanussi@linux.intel.com Signed-off-by: Zhengjun Xing zhengjun.xing@linux.intel.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/trace/trace_events_hist.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index bdf104596d122..dac518977e7d0 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -448,6 +448,8 @@ static bool synth_field_signed(char *type) { if (strncmp(type, "u", 1) == 0) return false; + if (strcmp(type, "gfp_t") == 0) + return false;
return true; }