linux-kernel - Re: [PATCH v3 2/4] cxl: Update Soft Reserved resources upon region creation

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Message-ID: <202504042103.wFCRBR7K-lkp@intel.com>
Date: Fri, 4 Apr 2025 21:58:06 +0800
From: kernel test robot <lkp@...el.com>
To: Terry Bowman <terry.bowman@....com>, dave@...olabs.net,
	jonathan.cameron@...wei.com, dave.jiang@...el.com,
	alison.schofield@...el.com, vishal.l.verma@...el.com,
	ira.weiny@...el.com, dan.j.williams@...el.com, willy@...radead.org,
	jack@...e.cz, rafael@...nel.org, len.brown@...el.com, pavel@....cz,
	ming.li@...omail.com, nathan.fontenot@....com,
	Smita.KoralahalliChannabasappa@....com,
	huang.ying.caritas@...il.com, yaoxt.fnst@...itsu.com,
	peterz@...radead.org, gregkh@...uxfoundation.org,
	quic_jjohnson@...cinc.com, ilpo.jarvinen@...ux.intel.com,
	bhelgaas@...gle.com, andriy.shevchenko@...ux.intel.com,
	mika.westerberg@...ux.intel.com, akpm@...ux-foundation.org,
	gourry@...rry.net, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH v3 2/4] cxl: Update Soft Reserved resources upon region
 creation

Hi Terry,

kernel test robot noticed the following build errors:

[auto build test ERROR on aae0594a7053c60b82621136257c8b648c67b512]

url:    https://github.com/intel-lab-lkp/linux/commits/Terry-Bowman/kernel-resource-Provide-mem-region-release-for-SOFT-RESERVES/20250404-023601
base:   aae0594a7053c60b82621136257c8b648c67b512
patch link:    https://lore.kernel.org/r/20250403183315.286710-3-terry.bowman%40amd.com
patch subject: [PATCH v3 2/4] cxl: Update Soft Reserved resources upon region creation
config: hexagon-randconfig-001-20250404 (https://download.01.org/0day-ci/archive/20250404/202504042103.wFCRBR7K-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250404/202504042103.wFCRBR7K-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/202504042103.wFCRBR7K-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/cxl/core/suspend.c:7:
>> drivers/cxl/cxlpci.h:126:2: error: call to undeclared function 'pcie_capability_read_word'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           pcie_capability_read_word(pdev, PCI_EXP_LNKSTA2, &lnksta2);
           ^
   1 error generated.


vim +/pcie_capability_read_word +126 drivers/cxl/cxlpci.h

e0c818e00443ce Robert Richter 2024-02-16  116  
4d07a05397c8c1 Dave Jiang     2023-12-21  117  /*
4d07a05397c8c1 Dave Jiang     2023-12-21  118   * CXL v3.0 6.2.3 Table 6-4
4d07a05397c8c1 Dave Jiang     2023-12-21  119   * The table indicates that if PCIe Flit Mode is set, then CXL is in 256B flits
4d07a05397c8c1 Dave Jiang     2023-12-21  120   * mode, otherwise it's 68B flits mode.
4d07a05397c8c1 Dave Jiang     2023-12-21  121   */
4d07a05397c8c1 Dave Jiang     2023-12-21  122  static inline bool cxl_pci_flit_256(struct pci_dev *pdev)
4d07a05397c8c1 Dave Jiang     2023-12-21  123  {
4d07a05397c8c1 Dave Jiang     2023-12-21  124  	u16 lnksta2;
4d07a05397c8c1 Dave Jiang     2023-12-21  125  
4d07a05397c8c1 Dave Jiang     2023-12-21 @126  	pcie_capability_read_word(pdev, PCI_EXP_LNKSTA2, &lnksta2);
4d07a05397c8c1 Dave Jiang     2023-12-21  127  	return lnksta2 & PCI_EXP_LNKSTA2_FLIT;
4d07a05397c8c1 Dave Jiang     2023-12-21  128  }
4d07a05397c8c1 Dave Jiang     2023-12-21  129  

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