Commit 9fa8c9c6 authored by Zhengjun Xing's avatar Zhengjun Xing Committed by Steven Rostedt (VMware)

tracing: Fix "gfp_t" format for synthetic events

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.comReviewed-by: default avatarTom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: default avatarZhengjun Xing <zhengjun.xing@linux.intel.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 4f5cafb5
...@@ -679,6 +679,8 @@ static bool synth_field_signed(char *type) ...@@ -679,6 +679,8 @@ static bool synth_field_signed(char *type)
{ {
if (str_has_prefix(type, "u")) if (str_has_prefix(type, "u"))
return false; return false;
if (strcmp(type, "gfp_t") == 0)
return false;
return true; return true;
} }
......
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