diff options
| author | Waiman Long <longman@redhat.com> | 2020-04-21 16:07:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-02 09:48:53 +0300 |
| commit | 9c5c94c5012cee14a6a8f71568a1f1c0a8fc9a5b (patch) | |
| tree | 6e4b11a638401f24dcd5f3235898a385d8351063 /block | |
| parent | b9c31556c37b43685efe0e9bf0555fb3b01607d5 (diff) | |
| download | linux-9c5c94c5012cee14a6a8f71568a1f1c0a8fc9a5b.tar.xz | |
blk-iocost: Fix error on iocost_ioc_vrate_adj
commit d6c8e949a35d6906d6c03a50e9a9cdf4e494528a upstream.
Systemtap 4.2 is unable to correctly interpret the "u32 (*missed_ppm)[2]"
argument of the iocost_ioc_vrate_adj trace entry defined in
include/trace/events/iocost.h leading to the following error:
/tmp/stapAcz0G0/stap_c89c58b83cea1724e26395efa9ed4939_6321_aux_6.c:78:8:
error: expected ‘;’, ‘,’ or ‘)’ before ‘*’ token
, u32[]* __tracepoint_arg_missed_ppm
That argument type is indeed rather complex and hard to read. Looking
at block/blk-iocost.c. It is just a 2-entry u32 array. By simplifying
the argument to a simple "u32 *missed_ppm" and adjusting the trace
entry accordingly, the compilation error was gone.
Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost")
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-iocost.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 9a599cc28c29..2dc5dc54e257 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -1594,7 +1594,7 @@ skip_surplus_transfers: vrate_min, vrate_max); } - trace_iocost_ioc_vrate_adj(ioc, vrate, &missed_ppm, rq_wait_pct, + trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, nr_lagging, nr_shortages, nr_surpluses); @@ -1603,7 +1603,7 @@ skip_surplus_transfers: ioc->period_us * vrate * INUSE_MARGIN_PCT, 100); } else if (ioc->busy_level != prev_busy_level || nr_lagging) { trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate), - &missed_ppm, rq_wait_pct, nr_lagging, + missed_ppm, rq_wait_pct, nr_lagging, nr_shortages, nr_surpluses); } |