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Message-ID: <202010240356.04GQOaBt-lkp@intel.com>
Date: Sat, 24 Oct 2020 04:02:13 +0800
From: kernel test robot <lkp@...el.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-media@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 56/56] scrpits: kernel-doc: validate kernel-doc markup
with the actual names
Hi Mauro,
I love your patch! Perhaps something to improve:
[auto build test WARNING on next-20201023]
[cannot apply to linuxtv-media/master sound/for-next pci/next mkp-scsi/for-next scsi/for-next linus/master v5.9 v5.9-rc8 v5.9-rc7 v5.9]
[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/Mauro-Carvalho-Chehab/Fix-several-bad-kernel-doc-markups/20201024-004025
base: 9695c4ff26459ff5bfe25c7d6179e4c9c00e1363
config: riscv-randconfig-r002-20201024 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 147b9497e79a98a8614b2b5eb4ba653b44f6b6f0)
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 riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://github.com/0day-ci/linux/commit/002bbfc5a97ce37daf3c570e0edd28fa0c7de5b8
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Mauro-Carvalho-Chehab/Fix-several-bad-kernel-doc-markups/20201024-004025
git checkout 002bbfc5a97ce37daf3c570e0edd28fa0c7de5b8
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> drivers/clk/analogbits/wrpll-cln28hpc.c:223: warning: expecting prototype for wrpll_configure(). Prototype was for wrpll_configure_for_rate() instead
vim +223 drivers/clk/analogbits/wrpll-cln28hpc.c
7b9487a9a5c41ce Paul Walmsley 2019-04-30 199
7b9487a9a5c41ce Paul Walmsley 2019-04-30 200 /**
7b9487a9a5c41ce Paul Walmsley 2019-04-30 201 * wrpll_configure() - compute PLL configuration for a target rate
7b9487a9a5c41ce Paul Walmsley 2019-04-30 202 * @c: ptr to a struct wrpll_cfg record to write into
7b9487a9a5c41ce Paul Walmsley 2019-04-30 203 * @target_rate: target PLL output clock rate (post-Q-divider)
7b9487a9a5c41ce Paul Walmsley 2019-04-30 204 * @parent_rate: PLL input refclk rate (pre-R-divider)
7b9487a9a5c41ce Paul Walmsley 2019-04-30 205 *
7b9487a9a5c41ce Paul Walmsley 2019-04-30 206 * Compute the appropriate PLL signal configuration values and store
7b9487a9a5c41ce Paul Walmsley 2019-04-30 207 * in PLL context @c. PLL reprogramming is not glitchless, so the
7b9487a9a5c41ce Paul Walmsley 2019-04-30 208 * caller should switch any downstream logic to a different clock
7b9487a9a5c41ce Paul Walmsley 2019-04-30 209 * source or clock-gate it before presenting these values to the PLL
7b9487a9a5c41ce Paul Walmsley 2019-04-30 210 * configuration signals.
7b9487a9a5c41ce Paul Walmsley 2019-04-30 211 *
7b9487a9a5c41ce Paul Walmsley 2019-04-30 212 * The caller must pass this function a pre-initialized struct
7b9487a9a5c41ce Paul Walmsley 2019-04-30 213 * wrpll_cfg record: either initialized to zero (with the
7b9487a9a5c41ce Paul Walmsley 2019-04-30 214 * exception of the .name and .flags fields) or read from the PLL.
7b9487a9a5c41ce Paul Walmsley 2019-04-30 215 *
7b9487a9a5c41ce Paul Walmsley 2019-04-30 216 * Context: Any context. Caller must protect the memory pointed to by @c
7b9487a9a5c41ce Paul Walmsley 2019-04-30 217 * from simultaneous access or modification.
7b9487a9a5c41ce Paul Walmsley 2019-04-30 218 *
7b9487a9a5c41ce Paul Walmsley 2019-04-30 219 * Return: 0 upon success; anything else upon failure.
7b9487a9a5c41ce Paul Walmsley 2019-04-30 220 */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 221 int wrpll_configure_for_rate(struct wrpll_cfg *c, u32 target_rate,
7b9487a9a5c41ce Paul Walmsley 2019-04-30 222 unsigned long parent_rate)
7b9487a9a5c41ce Paul Walmsley 2019-04-30 @223 {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 224 unsigned long ratio;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 225 u64 target_vco_rate, delta, best_delta, f_pre_div, vco, vco_pre;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 226 u32 best_f, f, post_divr_freq;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 227 u8 fbdiv, divq, best_r, r;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 228 int range;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 229
7b9487a9a5c41ce Paul Walmsley 2019-04-30 230 if (c->flags == 0) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 231 WARN(1, "%s called with uninitialized PLL config", __func__);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 232 return -EINVAL;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 233 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 234
7b9487a9a5c41ce Paul Walmsley 2019-04-30 235 /* Initialize rounding data if it hasn't been initialized already */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 236 if (parent_rate != c->parent_rate) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 237 if (__wrpll_update_parent_rate(c, parent_rate)) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 238 pr_err("%s: PLL input rate is out of range\n",
7b9487a9a5c41ce Paul Walmsley 2019-04-30 239 __func__);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 240 return -ERANGE;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 241 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 242 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 243
7b9487a9a5c41ce Paul Walmsley 2019-04-30 244 c->flags &= ~WRPLL_FLAGS_RESET_MASK;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 245
7b9487a9a5c41ce Paul Walmsley 2019-04-30 246 /* Put the PLL into bypass if the user requests the parent clock rate */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 247 if (target_rate == parent_rate) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 248 c->flags |= WRPLL_FLAGS_BYPASS_MASK;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 249 return 0;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 250 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 251
7b9487a9a5c41ce Paul Walmsley 2019-04-30 252 c->flags &= ~WRPLL_FLAGS_BYPASS_MASK;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 253
7b9487a9a5c41ce Paul Walmsley 2019-04-30 254 /* Calculate the Q shift and target VCO rate */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 255 divq = __wrpll_calc_divq(target_rate, &target_vco_rate);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 256 if (!divq)
7b9487a9a5c41ce Paul Walmsley 2019-04-30 257 return -1;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 258 c->divq = divq;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 259
7b9487a9a5c41ce Paul Walmsley 2019-04-30 260 /* Precalculate the pre-Q divider target ratio */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 261 ratio = div64_u64((target_vco_rate << ROUND_SHIFT), parent_rate);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 262
7b9487a9a5c41ce Paul Walmsley 2019-04-30 263 fbdiv = __wrpll_calc_fbdiv(c);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 264 best_r = 0;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 265 best_f = 0;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 266 best_delta = MAX_VCO_FREQ;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 267
7b9487a9a5c41ce Paul Walmsley 2019-04-30 268 /*
7b9487a9a5c41ce Paul Walmsley 2019-04-30 269 * Consider all values for R which land within
7b9487a9a5c41ce Paul Walmsley 2019-04-30 270 * [MIN_POST_DIVR_FREQ, MAX_POST_DIVR_FREQ]; prefer smaller R
7b9487a9a5c41ce Paul Walmsley 2019-04-30 271 */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 272 for (r = c->init_r; r <= c->max_r; ++r) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 273 f_pre_div = ratio * r;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 274 f = (f_pre_div + (1 << ROUND_SHIFT)) >> ROUND_SHIFT;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 275 f >>= (fbdiv - 1);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 276
7b9487a9a5c41ce Paul Walmsley 2019-04-30 277 post_divr_freq = div_u64(parent_rate, r);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 278 vco_pre = fbdiv * post_divr_freq;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 279 vco = vco_pre * f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 280
7b9487a9a5c41ce Paul Walmsley 2019-04-30 281 /* Ensure rounding didn't take us out of range */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 282 if (vco > target_vco_rate) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 283 --f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 284 vco = vco_pre * f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 285 } else if (vco < MIN_VCO_FREQ) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 286 ++f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 287 vco = vco_pre * f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 288 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 289
7b9487a9a5c41ce Paul Walmsley 2019-04-30 290 delta = abs(target_rate - vco);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 291 if (delta < best_delta) {
7b9487a9a5c41ce Paul Walmsley 2019-04-30 292 best_delta = delta;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 293 best_r = r;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 294 best_f = f;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 295 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 296 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 297
7b9487a9a5c41ce Paul Walmsley 2019-04-30 298 c->divr = best_r - 1;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 299 c->divf = best_f - 1;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 300
7b9487a9a5c41ce Paul Walmsley 2019-04-30 301 post_divr_freq = div_u64(parent_rate, best_r);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 302
7b9487a9a5c41ce Paul Walmsley 2019-04-30 303 /* Pick the best PLL jitter filter */
7b9487a9a5c41ce Paul Walmsley 2019-04-30 304 range = __wrpll_calc_filter_range(post_divr_freq);
7b9487a9a5c41ce Paul Walmsley 2019-04-30 305 if (range < 0)
7b9487a9a5c41ce Paul Walmsley 2019-04-30 306 return range;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 307 c->range = range;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 308
7b9487a9a5c41ce Paul Walmsley 2019-04-30 309 return 0;
7b9487a9a5c41ce Paul Walmsley 2019-04-30 310 }
7b9487a9a5c41ce Paul Walmsley 2019-04-30 311
---
0-DAY CI Kernel Test Service, Intel Corporation
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