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authorPratyush Anand <panand@redhat.com>2015-08-27 07:31:33 +0300
committerJ. Bruce Fields <bfields@redhat.com>2015-08-31 23:32:15 +0300
commit051ac3848a94f21cfdec899cc9c65ce7f9f116fa (patch)
tree9987429bd04444a201604cd27457d3eb825fe9dd /include/trace
parent51a545685905c934237e640083bc3aa40b36dc14 (diff)
downloadlinux-051ac3848a94f21cfdec899cc9c65ce7f9f116fa.tar.xz
net: sunrpc: fix tracepoint Warning: unknown op '->'
`perf stat -e sunrpc:svc_xprt_do_enqueue true` results in Warning: unknown op '->' Warning: [sunrpc:svc_xprt_do_enqueue] unknown op '->' Similar warning for svc_handle_xprt as well. Actually TP_printk() should never dereference an address saved in the ring buffer that points somewhere in the kernel. There's no guarantee that that object still exists (with the exception of static strings). Therefore change all the arguments for TP_printk(), so that it references values existing in the ring buffer only. While doing that, also fix another possible bug when argument xprt could be NULL and TP_fast_assign() tries to access it's elements. Signed-off-by: Pratyush Anand <panand@redhat.com> Reviewed-by: Jeff Layton <jeff.layton@primarydata.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: stable@vger.kernel.org Fixes: 83a712e0afef "sunrpc: add some tracepoints around ..." Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/sunrpc.h21
1 files changed, 14 insertions, 7 deletions
diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index fd1a02cb3c82..003dca933803 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -529,18 +529,21 @@ TRACE_EVENT(svc_xprt_do_enqueue,
TP_STRUCT__entry(
__field(struct svc_xprt *, xprt)
- __field(struct svc_rqst *, rqst)
+ __field_struct(struct sockaddr_storage, ss)
+ __field(int, pid)
+ __field(unsigned long, flags)
),
TP_fast_assign(
__entry->xprt = xprt;
- __entry->rqst = rqst;
+ xprt ? memcpy(&__entry->ss, &xprt->xpt_remote, sizeof(__entry->ss)) : memset(&__entry->ss, 0, sizeof(__entry->ss));
+ __entry->pid = rqst? rqst->rq_task->pid : 0;
+ __entry->flags = xprt ? xprt->xpt_flags : 0;
),
TP_printk("xprt=0x%p addr=%pIScp pid=%d flags=%s", __entry->xprt,
- (struct sockaddr *)&__entry->xprt->xpt_remote,
- __entry->rqst ? __entry->rqst->rq_task->pid : 0,
- show_svc_xprt_flags(__entry->xprt->xpt_flags))
+ (struct sockaddr *)&__entry->ss,
+ __entry->pid, show_svc_xprt_flags(__entry->flags))
);
TRACE_EVENT(svc_xprt_dequeue,
@@ -589,16 +592,20 @@ TRACE_EVENT(svc_handle_xprt,
TP_STRUCT__entry(
__field(struct svc_xprt *, xprt)
__field(int, len)
+ __field_struct(struct sockaddr_storage, ss)
+ __field(unsigned long, flags)
),
TP_fast_assign(
__entry->xprt = xprt;
+ xprt ? memcpy(&__entry->ss, &xprt->xpt_remote, sizeof(__entry->ss)) : memset(&__entry->ss, 0, sizeof(__entry->ss));
__entry->len = len;
+ __entry->flags = xprt ? xprt->xpt_flags : 0;
),
TP_printk("xprt=0x%p addr=%pIScp len=%d flags=%s", __entry->xprt,
- (struct sockaddr *)&__entry->xprt->xpt_remote, __entry->len,
- show_svc_xprt_flags(__entry->xprt->xpt_flags))
+ (struct sockaddr *)&__entry->ss,
+ __entry->len, show_svc_xprt_flags(__entry->flags))
);
#endif /* _TRACE_SUNRPC_H */