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Message-ID: <202408271846.xZq9AEQa-lkp@intel.com>
Date: Tue, 27 Aug 2024 18:37:39 +0800
From: kernel test robot <lkp@...el.com>
To: jiping huang <huangjiping95@...com>, mturquette@...libre.com,
sboyd@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
jiping huang <huangjiping95@...com>
Subject: Re: [PATCH] clk: Delete redundant logic.
Hi jiping,
kernel test robot noticed the following build warnings:
[auto build test WARNING on clk/clk-next]
[also build test WARNING on linus/master v6.11-rc5 next-20240827]
[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#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/jiping-huang/clk-Delete-redundant-logic/20240826-170900
base: https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
patch link: https://lore.kernel.org/r/tencent_713186AE6290AC7B8037FD247F5BF04C0308%40qq.com
patch subject: [PATCH] clk: Delete redundant logic.
config: i386-buildonly-randconfig-005-20240827 (https://download.01.org/0day-ci/archive/20240827/202408271846.xZq9AEQa-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240827/202408271846.xZq9AEQa-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408271846.xZq9AEQa-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/clk/clk.c:2320:14: warning: variable 'parent' is uninitialized when used here [-Wuninitialized]
2320 | } else if (!parent || !(core->flags & CLK_SET_RATE_PARENT)) {
| ^~~~~~
drivers/clk/clk.c:2286:38: note: initialize the variable 'parent' to silence this warning
2286 | struct clk_core *old_parent, *parent;
| ^
| = NULL
>> drivers/clk/clk.c:2332:16: warning: variable 'old_parent' is uninitialized when used here [-Wuninitialized]
2332 | if (parent != old_parent &&
| ^~~~~~~~~~
drivers/clk/clk.c:2286:29: note: initialize the variable 'old_parent' to silence this warning
2286 | struct clk_core *old_parent, *parent;
| ^
| = NULL
2 warnings generated.
vim +/parent +2320 drivers/clk/clk.c
b2476490ef11134 Mike Turquette 2012-03-15 2277
4dff95dc9477a34 Stephen Boyd 2015-04-30 2278 /*
4dff95dc9477a34 Stephen Boyd 2015-04-30 2279 * calculate the new rates returning the topmost clock that has to be
4dff95dc9477a34 Stephen Boyd 2015-04-30 2280 * changed.
4dff95dc9477a34 Stephen Boyd 2015-04-30 2281 */
4dff95dc9477a34 Stephen Boyd 2015-04-30 2282 static struct clk_core *clk_calc_new_rates(struct clk_core *core,
4dff95dc9477a34 Stephen Boyd 2015-04-30 2283 unsigned long rate)
4dff95dc9477a34 Stephen Boyd 2015-04-30 2284 {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2285 struct clk_core *top = core;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2286 struct clk_core *old_parent, *parent;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2287 unsigned long best_parent_rate = 0;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2288 unsigned long new_rate;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2289 unsigned long min_rate;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2290 unsigned long max_rate;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2291 int p_index = 0;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2292 long ret;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2293
4dff95dc9477a34 Stephen Boyd 2015-04-30 2294 /* sanity */
4dff95dc9477a34 Stephen Boyd 2015-04-30 2295 if (IS_ERR_OR_NULL(core))
4dff95dc9477a34 Stephen Boyd 2015-04-30 2296 return NULL;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2297
4dff95dc9477a34 Stephen Boyd 2015-04-30 2298 clk_core_get_boundaries(core, &min_rate, &max_rate);
71472c0c06cf9a3 James Hogan 2013-07-29 2299
4dff95dc9477a34 Stephen Boyd 2015-04-30 2300 /* find the closest rate and parent clk/rate */
0f6cc2b8e94da54 Jerome Brunet 2017-12-01 2301 if (clk_core_can_round(core)) {
0817b62cc037a56 Boris Brezillon 2015-07-07 2302 struct clk_rate_request req;
0817b62cc037a56 Boris Brezillon 2015-07-07 2303
718af795d3fd786 Maxime Ripard 2022-08-16 2304 clk_core_init_rate_req(core, &req, rate);
0f6cc2b8e94da54 Jerome Brunet 2017-12-01 2305
49e62e0d96baf72 Maxime Ripard 2022-10-26 2306 trace_clk_rate_request_start(&req);
49e62e0d96baf72 Maxime Ripard 2022-10-26 2307
0f6cc2b8e94da54 Jerome Brunet 2017-12-01 2308 ret = clk_core_determine_round_nolock(core, &req);
4dff95dc9477a34 Stephen Boyd 2015-04-30 2309 if (ret < 0)
4dff95dc9477a34 Stephen Boyd 2015-04-30 2310 return NULL;
035a61c314eb3da Tomeu Vizoso 2015-01-23 2311
49e62e0d96baf72 Maxime Ripard 2022-10-26 2312 trace_clk_rate_request_done(&req);
49e62e0d96baf72 Maxime Ripard 2022-10-26 2313
0817b62cc037a56 Boris Brezillon 2015-07-07 2314 best_parent_rate = req.best_parent_rate;
0817b62cc037a56 Boris Brezillon 2015-07-07 2315 new_rate = req.rate;
0817b62cc037a56 Boris Brezillon 2015-07-07 2316 parent = req.best_parent_hw ? req.best_parent_hw->core : NULL;
1c8e600440c7f50 Tomeu Vizoso 2015-01-23 2317
4dff95dc9477a34 Stephen Boyd 2015-04-30 2318 if (new_rate < min_rate || new_rate > max_rate)
4dff95dc9477a34 Stephen Boyd 2015-04-30 2319 return NULL;
4dff95dc9477a34 Stephen Boyd 2015-04-30 @2320 } else if (!parent || !(core->flags & CLK_SET_RATE_PARENT)) {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2321 /* pass-through clock without adjustable parent */
4dff95dc9477a34 Stephen Boyd 2015-04-30 2322 core->new_rate = core->rate;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2323 return NULL;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2324 } else {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2325 /* pass-through clock with adjustable parent */
4dff95dc9477a34 Stephen Boyd 2015-04-30 2326 top = clk_calc_new_rates(parent, rate);
4dff95dc9477a34 Stephen Boyd 2015-04-30 2327 new_rate = parent->new_rate;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2328 goto out;
1c8e600440c7f50 Tomeu Vizoso 2015-01-23 2329 }
035a61c314eb3da Tomeu Vizoso 2015-01-23 2330
4dff95dc9477a34 Stephen Boyd 2015-04-30 2331 /* some clocks must be gated to change parent */
4dff95dc9477a34 Stephen Boyd 2015-04-30 @2332 if (parent != old_parent &&
4dff95dc9477a34 Stephen Boyd 2015-04-30 2333 (core->flags & CLK_SET_PARENT_GATE) && core->prepare_count) {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2334 pr_debug("%s: %s not gated but wants to reparent\n",
4dff95dc9477a34 Stephen Boyd 2015-04-30 2335 __func__, core->name);
4dff95dc9477a34 Stephen Boyd 2015-04-30 2336 return NULL;
035a61c314eb3da Tomeu Vizoso 2015-01-23 2337 }
b2476490ef11134 Mike Turquette 2012-03-15 2338
4dff95dc9477a34 Stephen Boyd 2015-04-30 2339 /* try finding the new parent index */
4dff95dc9477a34 Stephen Boyd 2015-04-30 2340 if (parent && core->num_parents > 1) {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2341 p_index = clk_fetch_parent_index(core, parent);
4dff95dc9477a34 Stephen Boyd 2015-04-30 2342 if (p_index < 0) {
4dff95dc9477a34 Stephen Boyd 2015-04-30 2343 pr_debug("%s: clk %s can not be parent of clk %s\n",
4dff95dc9477a34 Stephen Boyd 2015-04-30 2344 __func__, parent->name, core->name);
4dff95dc9477a34 Stephen Boyd 2015-04-30 2345 return NULL;
4dff95dc9477a34 Stephen Boyd 2015-04-30 2346 }
4dff95dc9477a34 Stephen Boyd 2015-04-30 2347 }
b2476490ef11134 Mike Turquette 2012-03-15 2348
4dff95dc9477a34 Stephen Boyd 2015-04-30 2349 if ((core->flags & CLK_SET_RATE_PARENT) && parent &&
4dff95dc9477a34 Stephen Boyd 2015-04-30 2350 best_parent_rate != parent->rate)
4dff95dc9477a34 Stephen Boyd 2015-04-30 2351 top = clk_calc_new_rates(parent, best_parent_rate);
035a61c314eb3da Tomeu Vizoso 2015-01-23 2352
4dff95dc9477a34 Stephen Boyd 2015-04-30 2353 out:
4dff95dc9477a34 Stephen Boyd 2015-04-30 2354 clk_calc_subtree(core, new_rate, parent, p_index);
b2476490ef11134 Mike Turquette 2012-03-15 2355
4dff95dc9477a34 Stephen Boyd 2015-04-30 2356 return top;
b2476490ef11134 Mike Turquette 2012-03-15 2357 }
b2476490ef11134 Mike Turquette 2012-03-15 2358
--
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