Re: [PATCH v2] tracepoints: Do not punish non static call users

From: kernel test robot
Date: Sat Feb 06 2021 - 02:00:43 EST

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In reply to: kernel test robot: "Re: [PATCH v2] tracepoints: Do not punish non static call users"
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Hi Steven,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tip/perf/core]
[also build test WARNING on linux/master linus/master v5.11-rc6 next-20210125]
[cannot apply to hnaz-linux-mm/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Steven-Rostedt/tracepoints-Do-not-punish-non-static-call-users/20210206-112501
base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 32451614da2a9cf4296f90d3606ac77814fb519d
config: arm64-randconfig-r033-20210206 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/0day-ci/linux/commit/3fc399c60e990487bf5d0cd91406052c0db853df
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Steven-Rostedt/tracepoints-Do-not-punish-non-static-call-users/20210206-112501
git checkout 3fc399c60e990487bf5d0cd91406052c0db853df
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from block/blk-wbt.c:32:
>> include/trace/events/wbt.h:15:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(wbt_stat,
^~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/wbt.h:15:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from block/blk-wbt.c:32:
>> include/trace/events/wbt.h:15:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(wbt_stat,
^~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/wbt.h:15:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:254:2: note: expanded from macro '__DECLARE_TRACE'
__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:216:4: note: expanded from macro '__DECLARE_TRACE_RCU'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from block/blk-wbt.c:32:
include/trace/events/wbt.h:59:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(wbt_lat,
^~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/wbt.h:59:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from block/blk-wbt.c:32:
include/trace/events/wbt.h:59:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(wbt_lat,
^~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/wbt.h:59:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
--
In file included from drivers/dma/tegra20-apb-dma.c:32:
>> include/trace/events/tegra_apb_dma.h:10:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(tegra_dma_tx_status,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/tegra_apb_dma.h:10:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/dma/tegra20-apb-dma.c:32:
>> include/trace/events/tegra_apb_dma.h:10:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(tegra_dma_tx_status,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/tegra_apb_dma.h:10:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:254:2: note: expanded from macro '__DECLARE_TRACE'
__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:216:4: note: expanded from macro '__DECLARE_TRACE_RCU'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/dma/tegra20-apb-dma.c:32:
include/trace/events/tegra_apb_dma.h:27:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(tegra_dma_complete_cb,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/tegra_apb_dma.h:27:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/dma/tegra20-apb-dma.c:32:
include/trace/events/tegra_apb_dma.h:27:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(tegra_dma_complete_cb,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/tegra_apb_dma.h:27:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
--
In file included from drivers/target/target_core_transport.c:41:
>> include/trace/events/target.h:132:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(target_sequencer_start,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/target.h:132:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/target/target_core_transport.c:41:
>> include/trace/events/target.h:132:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(target_sequencer_start,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/target.h:132:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:254:2: note: expanded from macro '__DECLARE_TRACE'
__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:216:4: note: expanded from macro '__DECLARE_TRACE_RCU'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/target/target_core_transport.c:41:
include/trace/events/target.h:169:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(target_cmd_complete,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/target.h:169:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/linux/tracepoint.h:414:2: note: expanded from macro 'DECLARE_TRACE'
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
^
include/linux/tracepoint.h:244:4: note: expanded from macro '__DECLARE_TRACE'
__DO_TRACE(name, \
^
include/linux/tracepoint.h:181:3: note: expanded from macro '__DO_TRACE'
void __maybe_unused *__data; \
^
In file included from drivers/target/target_core_transport.c:41:
include/trace/events/target.h:169:1: warning: variable '__data' is uninitialized when used here [-Wuninitialized]
TRACE_EVENT(target_cmd_complete,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/tracepoint.h:417:11: note: expanded from macro 'DECLARE_TRACE'
PARAMS(__data, args))
^~~~~~
include/linux/tracepoint.h:97:25: note: expanded from macro 'PARAMS'
#define PARAMS(args...) args
^~~~
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/tracepoint.h:201:33: note: expanded from macro '__DO_TRACE'
__DO_TRACE_CALL(name, TP_ARGS(args)); \
^~~~
include/linux/tracepoint.h:138:26: note: expanded from macro 'TP_ARGS'
#define TP_ARGS(args...) args
^~~~
include/linux/tracepoint.h:166:56: note: expanded from macro '__DO_TRACE_CALL'
#define __DO_TRACE_CALL(name, args) __traceiter_##name(args)
^~~~
include/trace/events/target.h:169:1: note: variable '__data' is declared here
include/linux/tracepoint.h:550:2: note: expanded from macro 'TRACE_EVENT'
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
..

vim +/__data +15 include/trace/events/wbt.h

e34cbd307477ae Jens Axboe 2016-11-09 10
e34cbd307477ae Jens Axboe 2016-11-09 11 /**
e34cbd307477ae Jens Axboe 2016-11-09 12 * wbt_stat - trace stats for blk_wb
e34cbd307477ae Jens Axboe 2016-11-09 13 * @stat: array of read/write stats
e34cbd307477ae Jens Axboe 2016-11-09 14 */
e34cbd307477ae Jens Axboe 2016-11-09 @15 TRACE_EVENT(wbt_stat,
e34cbd307477ae Jens Axboe 2016-11-09 16
e34cbd307477ae Jens Axboe 2016-11-09 17 TP_PROTO(struct backing_dev_info *bdi, struct blk_rq_stat *stat),
e34cbd307477ae Jens Axboe 2016-11-09 18
e34cbd307477ae Jens Axboe 2016-11-09 19 TP_ARGS(bdi, stat),
e34cbd307477ae Jens Axboe 2016-11-09 20
e34cbd307477ae Jens Axboe 2016-11-09 21 TP_STRUCT__entry(
e34cbd307477ae Jens Axboe 2016-11-09 22 __array(char, name, 32)
e34cbd307477ae Jens Axboe 2016-11-09 23 __field(s64, rmean)
e34cbd307477ae Jens Axboe 2016-11-09 24 __field(u64, rmin)
e34cbd307477ae Jens Axboe 2016-11-09 25 __field(u64, rmax)
e34cbd307477ae Jens Axboe 2016-11-09 26 __field(s64, rnr_samples)
e34cbd307477ae Jens Axboe 2016-11-09 27 __field(s64, rtime)
e34cbd307477ae Jens Axboe 2016-11-09 28 __field(s64, wmean)
e34cbd307477ae Jens Axboe 2016-11-09 29 __field(u64, wmin)
e34cbd307477ae Jens Axboe 2016-11-09 30 __field(u64, wmax)
e34cbd307477ae Jens Axboe 2016-11-09 31 __field(s64, wnr_samples)
e34cbd307477ae Jens Axboe 2016-11-09 32 __field(s64, wtime)
e34cbd307477ae Jens Axboe 2016-11-09 33 ),
e34cbd307477ae Jens Axboe 2016-11-09 34
e34cbd307477ae Jens Axboe 2016-11-09 35 TP_fast_assign(
d51cfc53ade318 Yufen Yu 2020-05-04 36 strlcpy(__entry->name, bdi_dev_name(bdi),
1d200e9d6f635a Bart Van Assche 2019-09-30 37 ARRAY_SIZE(__entry->name));
e34cbd307477ae Jens Axboe 2016-11-09 38 __entry->rmean = stat[0].mean;
e34cbd307477ae Jens Axboe 2016-11-09 39 __entry->rmin = stat[0].min;
e34cbd307477ae Jens Axboe 2016-11-09 40 __entry->rmax = stat[0].max;
e34cbd307477ae Jens Axboe 2016-11-09 41 __entry->rnr_samples = stat[0].nr_samples;
e34cbd307477ae Jens Axboe 2016-11-09 42 __entry->wmean = stat[1].mean;
e34cbd307477ae Jens Axboe 2016-11-09 43 __entry->wmin = stat[1].min;
e34cbd307477ae Jens Axboe 2016-11-09 44 __entry->wmax = stat[1].max;
e34cbd307477ae Jens Axboe 2016-11-09 45 __entry->wnr_samples = stat[1].nr_samples;
e34cbd307477ae Jens Axboe 2016-11-09 46 ),
e34cbd307477ae Jens Axboe 2016-11-09 47
e34cbd307477ae Jens Axboe 2016-11-09 48 TP_printk("%s: rmean=%llu, rmin=%llu, rmax=%llu, rsamples=%llu, "
3f22037d382b45 Tommi Rantala 2020-04-17 49 "wmean=%llu, wmin=%llu, wmax=%llu, wsamples=%llu",
e34cbd307477ae Jens Axboe 2016-11-09 50 __entry->name, __entry->rmean, __entry->rmin, __entry->rmax,
e34cbd307477ae Jens Axboe 2016-11-09 51 __entry->rnr_samples, __entry->wmean, __entry->wmin,
e34cbd307477ae Jens Axboe 2016-11-09 52 __entry->wmax, __entry->wnr_samples)
e34cbd307477ae Jens Axboe 2016-11-09 53 );
e34cbd307477ae Jens Axboe 2016-11-09 54

---
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