linux-kernel - Re: [PATCH v2 2/2] cpufreq: amd-pstate: change cpu freq transition delay for some models

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Date: Thu, 23 May 2024 02:11:30 +0800
From: kernel test robot <lkp@...el.com>
To: Xiaojian Du <Xiaojian.Du@....com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, tglx@...utronix.de, mingo@...hat.com,
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
	daniel.sneddon@...ux.intel.com, jpoimboe@...nel.org,
	pawan.kumar.gupta@...ux.intel.com, sandipan.das@....com,
	kai.huang@...el.com, perry.yuan@....com, x86@...nel.org,
	ray.huang@....com, rafael@...nel.org,
	Xiaojian Du <Xiaojian.Du@....com>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2 2/2] cpufreq: amd-pstate: change cpu freq transition
 delay for some models

Hi Xiaojian,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/master]
[also build test WARNING on rafael-pm/linux-next rafael-pm/bleeding-edge linus/master next-20240522]
[cannot apply to tip/x86/core tip/auto-latest v6.9]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Xiaojian-Du/cpufreq-amd-pstate-change-cpu-freq-transition-delay-for-some-models/20240522-135241
base:   tip/master
patch link:    https://lore.kernel.org/r/b2c8fb2da41f9fb21f095f67d99cbdbd0aa34091.1716356681.git.Xiaojian.Du%40amd.com
patch subject: [PATCH v2 2/2] cpufreq: amd-pstate: change cpu freq transition delay for some models
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240523/202405230126.Ww25ogId-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240523/202405230126.Ww25ogId-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/202405230126.Ww25ogId-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/cpufreq/amd-pstate.c: In function 'amd_pstate_get_transition_delay_us':
>> drivers/cpufreq/amd-pstate.c:821:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
     821 |         if (transition_delay_ns == CPUFREQ_ETERNAL)
         |            ^


vim +/else +821 drivers/cpufreq/amd-pstate.c

e571a5e2068ef5 Meng Li     2024-01-19  811  
5131a3ca3518d7 Perry Yuan  2024-04-30  812  /*
069a2bb8c48c43 Perry Yuan  2024-04-25  813   * Get pstate transition delay time from ACPI tables that firmware set
069a2bb8c48c43 Perry Yuan  2024-04-25  814   * instead of using hardcode value directly.
069a2bb8c48c43 Perry Yuan  2024-04-25  815   */
069a2bb8c48c43 Perry Yuan  2024-04-25  816  static u32 amd_pstate_get_transition_delay_us(unsigned int cpu)
069a2bb8c48c43 Perry Yuan  2024-04-25  817  {
069a2bb8c48c43 Perry Yuan  2024-04-25  818  	u32 transition_delay_ns;
069a2bb8c48c43 Perry Yuan  2024-04-25  819  
069a2bb8c48c43 Perry Yuan  2024-04-25  820  	transition_delay_ns = cppc_get_transition_latency(cpu);
069a2bb8c48c43 Perry Yuan  2024-04-25 @821  	if (transition_delay_ns == CPUFREQ_ETERNAL)
be020c2c1f8622 Xiaojian Du 2024-05-22  822  		if (cpu_feature_enabled(X86_FEATURE_FAST_CPPC))
be020c2c1f8622 Xiaojian Du 2024-05-22  823  			return AMD_PSTATE_FAST_CPPC_TRANSITION_DELAY;
be020c2c1f8622 Xiaojian Du 2024-05-22  824  		else
069a2bb8c48c43 Perry Yuan  2024-04-25  825  			return AMD_PSTATE_TRANSITION_DELAY;
069a2bb8c48c43 Perry Yuan  2024-04-25  826  
069a2bb8c48c43 Perry Yuan  2024-04-25  827  	return transition_delay_ns / NSEC_PER_USEC;
069a2bb8c48c43 Perry Yuan  2024-04-25  828  }
069a2bb8c48c43 Perry Yuan  2024-04-25  829  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki