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blk-iocost: Fix error on iocost_ioc_vrate_adj

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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: 7caa47151a ("blkcg: implement blk-iocost")
Acked-by: Steven Rostedt (VMware) <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Waiman Long <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Waiman Long 2020-04-21 09:07:55 -04:00 • committed by Greg Kroah-Hartman
commit 9c5c94c501
2 changed files with 5 additions and 5 deletions
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4
block/blk-iocost.c
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@ -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);
}