linux-kernel - Re: [PATCH v6 4/8] x86/resctrl: Implement "io

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Message-ID: <9927b988-47b0-4937-9d6e-5dca767504fd@intel.com>
Date: Wed, 18 Jun 2025 13:32:53 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<paulmck@...nel.org>, <rostedt@...dmis.org>, <thuth@...hat.com>,
	<ardb@...nel.org>, <gregkh@...uxfoundation.org>, <seanjc@...gle.com>,
	<thomas.lendacky@....com>, <pawan.kumar.gupta@...ux.intel.com>,
	<perry.yuan@....com>, <yosry.ahmed@...ux.dev>, <kai.huang@...el.com>,
	<xiaoyao.li@...el.com>, <peterz@...radead.org>, <kan.liang@...ux.intel.com>,
	<mario.limonciello@....com>, <xin3.li@...el.com>, <sohil.mehta@...el.com>,
	<chang.seok.bae@...el.com>, <andrew.cooper3@...rix.com>,
	<ebiggers@...gle.com>, <ak@...ux.intel.com>, <xin@...or.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 4/8] x86/resctrl: Implement "io_alloc" enable/disable
 handlers

Hi Babu,

On 6/18/25 12:27 PM, Moger, Babu wrote:
 
> On 6/17/25 22:51, Reinette Chatre wrote:

>> On 6/11/25 2:23 PM, Babu Moger wrote:

>>>  static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
>>> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>>> index 885026468440..3bdcd53b3ce3 100644
>>> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>>> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>>> @@ -229,6 +229,46 @@ bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
>>>  	return rdt_resources_all[l].cdp_enabled;
>>>  }
>>>  
>>> +inline bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r)
>>
>> As indicated by lkp the inline usage needs to be fixed.
> 
> I am assuming that you are referring to
> https://www.kernel.org/doc/html/next/process/coding-style.html#the-inline-disease

No. I am referring to the lkp test report of an issue detected by sparse. Looks like
the message was not cc'd to lkml so I cannot provide link. I paste it below. You are in
"To:".

> 
> I will remove inline attribute.

The goal was to fix the broken usage of inline, but you are right that it may
not be needed here.

Here is the original report:

> Date: Fri, 13 Jun 2025 12:18:35 +0800
> From: kernel test robot <lkp@...el.com>
> To: Babu Moger <babu.moger@....com>, corbet@....net, tony.luck@...el.com, reinette.chatre@...el.com, Dave.Martin@....com, james.morse@....com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com
> CC: oe-kbuild-all@...ts.linux.dev, x86@...nel.org, hpa@...or.com, akpm@...ux-foundation.org, paulmck@...nel.org, rostedt@...dmis.org, thuth@...hat.com, ardb@...nel.org, gregkh@...uxfoundation.org, seanjc@...gle.com, thomas.lendacky@....com, pawan.kumar.gupta@...ux.intel.com, perry.yuan@....com, yosry.ahmed@...ux.dev, kai.huang@...el.com, xiaoyao.li@...el.com, peterz@...radead.org, kan.liang@...ux.intel.com, mario.limonciello@....com, xin3.li@...el.com, sohil.mehta@...el.com
> Subject: Re: [PATCH v6 5/8] fs/resctrl: Add user interface to enable/disable io_alloc feature
> Message-ID: <202506131104.d1oo8NWe-lkp@...el.com>
> In-Reply-To: <b3d8e2ccd23b295f3735fc9f5420458cfc18a896.1749677012.git.babu.moger@....com>
> 
> Hi Babu,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on brauner-vfs/vfs.all]
> [also build test WARNING on linus/master v6.16-rc1 next-20250612]
> [cannot apply to tip/x86/core aegl/next]
> [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/Babu-Moger/x86-cpufeatures-Add-support-for-L3-Smart-Data-Cache-Injection-Allocation-Enforcement/20250612-053050
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
> patch link:    https://lore.kernel.org/r/b3d8e2ccd23b295f3735fc9f5420458cfc18a896.1749677012.git.babu.moger%40amd.com
> patch subject: [PATCH v6 5/8] fs/resctrl: Add user interface to enable/disable io_alloc feature
> config: i386-randconfig-061-20250613 (https://download.01.org/0day-ci/archive/20250613/202506131104.d1oo8NWe-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250613/202506131104.d1oo8NWe-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/202506131104.d1oo8NWe-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
>    fs/resctrl/rdtgroup.c: note: in included file:
>>> include/linux/resctrl.h:553:46: sparse: sparse: marked inline, but without a definition
>>> include/linux/resctrl.h:553:46: sparse: sparse: marked inline, but without a definition
>>> include/linux/resctrl.h:553:46: sparse: sparse: marked inline, but without a definition
>>> include/linux/resctrl.h:553:46: sparse: sparse: marked inline, but without a definition
> 
> vim +553 include/linux/resctrl.h
> 
> 48e63934badb71 Babu Moger 2025-06-11  545  
> 48e63934badb71 Babu Moger 2025-06-11  546  /**
> 48e63934badb71 Babu Moger 2025-06-11  547   * resctrl_arch_get_io_alloc_enabled() - Get io_alloc feature state.
> 48e63934badb71 Babu Moger 2025-06-11  548   * @r:		The resctrl resource.
> 48e63934badb71 Babu Moger 2025-06-11  549   *
> 48e63934badb71 Babu Moger 2025-06-11  550   * Return:
> 48e63934badb71 Babu Moger 2025-06-11  551   * true if io_alloc is enabled or false if disabled.
> 48e63934badb71 Babu Moger 2025-06-11  552   */
> 48e63934badb71 Babu Moger 2025-06-11 @553  inline bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r);
> 48e63934badb71 Babu Moger 2025-06-11  554  
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

Reinette