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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: 83a712e0af "sunrpc: add some tracepoints around ..."
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Pratyush Anand 2015-08-27 10:01:33 +05:30 committed by J. Bruce Fields
parent 51a5456859
commit 051ac3848a
1 changed files with 14 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
include/trace/events/sunrpc.h
View File

@ -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 */