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List: alsa-devel
Subject: Re: [alsa-devel] [PATCH] pcm_native: Remove VLA usage
From: kbuild test robot <lkp () intel ! com>
Date: 2018-03-30 1:16:07
Message-ID: 201803300705.Q2Cu1Ddn%fengguang.wu () intel ! com
[Download RAW message or body]
Hi Kyle,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on v4.16-rc7]
[cannot apply to sound/for-next next-20180329]
[if your patch is applied to the wrong git tree, please drop us a note to help \
improve the system]
url: https://github.com/0day-ci/linux/commits/Kyle-Spiers/pcm_native-Remove-VLA-usage/20180330-073734
config: x86_64-randconfig-x019-201812 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (new ones prefixed by >>):
In file included from include/asm-generic/bug.h:5:0,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/mm.h:9,
from sound/core/pcm_native.c:22:
sound/core/pcm_native.c: In function 'constrain_params_by_rules':
include/linux/compiler.h:58:2: warning: this 'if' clause does not guard... \
[-Wmisleading-indentation] if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^
include/linux/compiler.h:56:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^~~~~~~~~~
> > sound/core/pcm_native.c:401:3: note: in expansion of macro 'if'
if (changed < 0)
^~
sound/core/pcm_native.c:403:4: note: ...this statement, but the latter is \
misleadingly indented as if it were guarded by the 'if' return changed;
^~~~~~
vim +/if +401 sound/core/pcm_native.c
^1da177e4 Linus Torvalds 2005-04-16 319
9cc07f55d Takashi Sakamoto 2017-06-09 320 static int \
constrain_params_by_rules(struct snd_pcm_substream *substream, 877211f5e Takashi Iwai \
2005-11-17 321 struct snd_pcm_hw_params *params) ^1da177e4 Linus Torvalds \
2005-04-16 322 { 9cc07f55d Takashi Sakamoto 2017-06-09 323 struct \
snd_pcm_hw_constraints *constrs = 9cc07f55d Takashi Sakamoto 2017-06-09 324 \
&substream->runtime->hw_constraints; ^1da177e4 Linus Torvalds 2005-04-16 325 \
unsigned int k; 16c438ade Kyle Spiers 2018-03-28 326 unsigned int *rstamps;
^1da177e4 Linus Torvalds 2005-04-16 327 unsigned int \
vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; d81052f92 Takashi Sakamoto 2017-06-09 \
328 unsigned int stamp; a1c06e39a Takashi Sakamoto 2017-06-09 329 struct \
snd_pcm_hw_rule *r; a1c06e39a Takashi Sakamoto 2017-06-09 330 unsigned int d;
9cc07f55d Takashi Sakamoto 2017-06-09 331 struct snd_mask old_mask;
9cc07f55d Takashi Sakamoto 2017-06-09 332 struct snd_interval old_interval;
a1c06e39a Takashi Sakamoto 2017-06-09 333 bool again;
9cc07f55d Takashi Sakamoto 2017-06-09 334 int changed;
^1da177e4 Linus Torvalds 2005-04-16 335
d81052f92 Takashi Sakamoto 2017-06-09 336 /*
d81052f92 Takashi Sakamoto 2017-06-09 337 * Each application of rule has own \
sequence number. d81052f92 Takashi Sakamoto 2017-06-09 338 *
d81052f92 Takashi Sakamoto 2017-06-09 339 * Each member of 'rstamps' array \
represents the sequence number of d81052f92 Takashi Sakamoto 2017-06-09 340 * \
recent application of corresponding rule. d81052f92 Takashi Sakamoto 2017-06-09 341 \
*/ 16c438ade Kyle Spiers 2018-03-28 342
16c438ade Kyle Spiers 2018-03-28 343 rstamps = kcalloc(constrs->rules_num, \
sizeof(*rstamps), GFP_KERNEL); d81052f92 Takashi Sakamoto 2017-06-09 344
d81052f92 Takashi Sakamoto 2017-06-09 345 /*
d81052f92 Takashi Sakamoto 2017-06-09 346 * Each member of 'vstamps' array \
represents the sequence number of d81052f92 Takashi Sakamoto 2017-06-09 347 * \
recent application of rule in which corresponding parameters were d81052f92 Takashi \
Sakamoto 2017-06-09 348 * changed. d81052f92 Takashi Sakamoto 2017-06-09 349 \
* d81052f92 Takashi Sakamoto 2017-06-09 350 * In initial state, elements \
corresponding to parameters requested by d81052f92 Takashi Sakamoto 2017-06-09 351 \
* a caller is 1. For unrequested parameters, corresponding members d81052f92 Takashi \
Sakamoto 2017-06-09 352 * have 0 so that the parameters are never changed \
anymore. d81052f92 Takashi Sakamoto 2017-06-09 353 */
^1da177e4 Linus Torvalds 2005-04-16 354 for (k = 0; k <= \
SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) ^1da177e4 Linus Torvalds 2005-04-16 355 \
vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; d81052f92 Takashi Sakamoto \
2017-06-09 356 d81052f92 Takashi Sakamoto 2017-06-09 357 /* Due to the above \
design, actual sequence number starts at 2. */ d81052f92 Takashi Sakamoto 2017-06-09 \
358 stamp = 2; 0d4e39996 Takashi Sakamoto 2017-06-09 359 retry:
d81052f92 Takashi Sakamoto 2017-06-09 360 /* Apply all rules in order. */
a1c06e39a Takashi Sakamoto 2017-06-09 361 again = false;
^1da177e4 Linus Torvalds 2005-04-16 362 for (k = 0; k < constrs->rules_num; k++) \
{ a1c06e39a Takashi Sakamoto 2017-06-09 363 r = &constrs->rules[k];
d81052f92 Takashi Sakamoto 2017-06-09 364
d81052f92 Takashi Sakamoto 2017-06-09 365 /*
d81052f92 Takashi Sakamoto 2017-06-09 366 * Check condition bits of this rule. \
When the rule has d81052f92 Takashi Sakamoto 2017-06-09 367 * some condition \
bits, parameter without the bits is d81052f92 Takashi Sakamoto 2017-06-09 368 * \
never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP d81052f92 Takashi Sakamoto \
2017-06-09 369 * is an example of the condition bits. d81052f92 Takashi Sakamoto \
2017-06-09 370 */ ^1da177e4 Linus Torvalds 2005-04-16 371 if (r->cond && \
!(r->cond & params->flags)) ^1da177e4 Linus Torvalds 2005-04-16 372 continue;
d81052f92 Takashi Sakamoto 2017-06-09 373
d81052f92 Takashi Sakamoto 2017-06-09 374 /*
d81052f92 Takashi Sakamoto 2017-06-09 375 * The 'deps' array includes maximum \
three dependencies d81052f92 Takashi Sakamoto 2017-06-09 376 * to \
SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth d81052f92 Takashi Sakamoto \
2017-06-09 377 * member of this array is a sentinel and should be d81052f92 \
Takashi Sakamoto 2017-06-09 378 * negative value. d81052f92 Takashi Sakamoto \
2017-06-09 379 * d81052f92 Takashi Sakamoto 2017-06-09 380 * This rule \
should be processed in this time when dependent d81052f92 Takashi Sakamoto 2017-06-09 \
381 * parameters were changed at former applications of the other d81052f92 \
Takashi Sakamoto 2017-06-09 382 * rules. d81052f92 Takashi Sakamoto 2017-06-09 \
383 */ ^1da177e4 Linus Torvalds 2005-04-16 384 for (d = 0; r->deps[d] >= 0; \
d++) { d656b4a65 Takashi Sakamoto 2017-06-09 385 if (vstamps[r->deps[d]] > \
rstamps[k]) ^1da177e4 Linus Torvalds 2005-04-16 386 break;
^1da177e4 Linus Torvalds 2005-04-16 387 }
d656b4a65 Takashi Sakamoto 2017-06-09 388 if (r->deps[d] < 0)
^1da177e4 Linus Torvalds 2005-04-16 389 continue;
be4e31dab Takashi Sakamoto 2017-06-07 390
be4e31dab Takashi Sakamoto 2017-06-07 391 if (trace_hw_mask_param_enabled()) {
be4e31dab Takashi Sakamoto 2017-06-07 392 if (hw_is_mask(r->var))
be4e31dab Takashi Sakamoto 2017-06-07 393 old_mask = *hw_param_mask(params, \
r->var); ^1da177e4 Linus Torvalds 2005-04-16 394 }
be4e31dab Takashi Sakamoto 2017-06-07 395 if (trace_hw_interval_param_enabled()) \
{ be4e31dab Takashi Sakamoto 2017-06-07 396 if (hw_is_interval(r->var))
be4e31dab Takashi Sakamoto 2017-06-07 397 old_interval = \
*hw_param_interval(params, r->var); ^1da177e4 Linus Torvalds 2005-04-16 398 }
c6706de0c Takashi Sakamoto 2017-06-07 399
^1da177e4 Linus Torvalds 2005-04-16 400 changed = r->func(params, r);
f74ae15fe Takashi Sakamoto 2017-06-11 @401 if (changed < 0)
16c438ade Kyle Spiers 2018-03-28 402 kfree(rstamps);
f74ae15fe Takashi Sakamoto 2017-06-11 403 return changed;
c6706de0c Takashi Sakamoto 2017-06-07 404
d81052f92 Takashi Sakamoto 2017-06-09 405 /*
82e7d5012 Takashi Sakamoto 2017-06-11 406 * When the parameter is changed, \
notify it to the caller d81052f92 Takashi Sakamoto 2017-06-09 407 * by \
corresponding returned bit, then preparing for next d81052f92 Takashi Sakamoto \
2017-06-09 408 * iteration. d81052f92 Takashi Sakamoto 2017-06-09 409 */
^1da177e4 Linus Torvalds 2005-04-16 410 if (changed && r->var >= 0) {
82e7d5012 Takashi Sakamoto 2017-06-11 411 if (hw_is_mask(r->var)) {
82e7d5012 Takashi Sakamoto 2017-06-11 412 trace_hw_mask_param(substream, \
r->var, 82e7d5012 Takashi Sakamoto 2017-06-11 413 k + 1, &old_mask,
82e7d5012 Takashi Sakamoto 2017-06-11 414 hw_param_mask(params, r->var));
^1da177e4 Linus Torvalds 2005-04-16 415 }
82e7d5012 Takashi Sakamoto 2017-06-11 416 if (hw_is_interval(r->var)) {
82e7d5012 Takashi Sakamoto 2017-06-11 417 trace_hw_interval_param(substream, \
r->var, 82e7d5012 Takashi Sakamoto 2017-06-11 418 k + 1, &old_interval,
82e7d5012 Takashi Sakamoto 2017-06-11 419 hw_param_interval(params, r->var));
^1da177e4 Linus Torvalds 2005-04-16 420 }
82e7d5012 Takashi Sakamoto 2017-06-11 421
^1da177e4 Linus Torvalds 2005-04-16 422 params->cmask |= (1 << r->var);
^1da177e4 Linus Torvalds 2005-04-16 423 vstamps[r->var] = stamp;
a1c06e39a Takashi Sakamoto 2017-06-09 424 again = true;
^1da177e4 Linus Torvalds 2005-04-16 425 }
f74ae15fe Takashi Sakamoto 2017-06-11 426
82e7d5012 Takashi Sakamoto 2017-06-11 427 rstamps[k] = stamp++;
^1da177e4 Linus Torvalds 2005-04-16 428 }
0d4e39996 Takashi Sakamoto 2017-06-09 429
d81052f92 Takashi Sakamoto 2017-06-09 430 /* Iterate to evaluate all rules till no \
parameters are changed. */ 0d4e39996 Takashi Sakamoto 2017-06-09 431 if (again)
0d4e39996 Takashi Sakamoto 2017-06-09 432 goto retry;
9cc07f55d Takashi Sakamoto 2017-06-09 433
16c438ade Kyle Spiers 2018-03-28 434 kfree(rstamps);
9cc07f55d Takashi Sakamoto 2017-06-09 435 return 0;
^1da177e4 Linus Torvalds 2005-04-16 436 }
9cc07f55d Takashi Sakamoto 2017-06-09 437
> > > > > > The code at line 401 was first introduced by commit
> > > > > > f74ae15fe3da7905b78e986ad906a333587cf160 ALSA: pcm: return error \
> > > > > > immediately for parameters handling
> > > > > > TO: Takashi Sakamoto <o-takashi@sakamocchi.jp>
> > > > > > CC: Takashi Iwai <tiwai@suse.de>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[".config.gz" (application/gzip)]
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