Re: [PATCH 03/12] PCI: dwc: Add unroll iATU space support to the regions disable method

From: kernel test robot <lkp@intel.com>
To: "Serge Semin" <Sergey.Semin@baikalelectronics.ru>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
	"Bjorn Helgaas" <helgaas@kernel.org>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Kishon Vijay Abraham I" <kishon@ti.com>
Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org,
	Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
	Frank Li <Frank.Li@nxp.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/12] PCI: dwc: Add unroll iATU space support to the regions disable method
Date: Tue, 29 Mar 2022 05:34:53 +0800	[thread overview]
Message-ID: <202203290527.iS9iplnr-lkp@intel.com> (raw)
In-Reply-To: <20220324012524.16784-4-Sergey.Semin@baikalelectronics.ru>

Hi Serge,

I love your patch! Perhaps something to improve:

[auto build test WARNING on helgaas-pci/next]
[also build test WARNING on v5.17 next-20220328]
[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/intel-lab-lkp/linux/commits/Serge-Semin/PCI-dwc-Various-fixes-and-cleanups/20220328-231112
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: x86_64-randconfig-a013-20220328 (https://download.01.org/0day-ci/archive/20220329/202203290527.iS9iplnr-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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
        # https://github.com/intel-lab-lkp/linux/commit/fb5c4386b8af12124d1e7b48bd7f538c12d85100
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Serge-Semin/PCI-dwc-Various-fixes-and-cleanups/20220328-231112
        git checkout fb5c4386b8af12124d1e7b48bd7f538c12d85100
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/pci/controller/dwc/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/dwc/pcie-designware.c:508:14: warning: result of comparison of constant 2147483648 with expression of type 'int' is always false [-Wtautological-constant-out-of-range-compare]
                   if (region == PCIE_ATU_REGION_INBOUND) {
                       ~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.

vim +/int +508 drivers/pci/controller/dwc/pcie-designware.c

   490	
   491	void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
   492				 enum dw_pcie_region_type type)
   493	{
   494		int region;
   495	
   496		switch (type) {
   497		case DW_PCIE_REGION_INBOUND:
   498			region = PCIE_ATU_REGION_INBOUND;
   499			break;
   500		case DW_PCIE_REGION_OUTBOUND:
   501			region = PCIE_ATU_REGION_OUTBOUND;
   502			break;
   503		default:
   504			return;
   505		}
   506	
   507		if (pci->iatu_unroll_enabled) {
 > 508			if (region == PCIE_ATU_REGION_INBOUND) {
   509				dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
   510							 ~(u32)PCIE_ATU_ENABLE);
   511			} else {
   512				dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
   513							 ~(u32)PCIE_ATU_ENABLE);
   514			}
   515		} else {
   516			dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index);
   517			dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~(u32)PCIE_ATU_ENABLE);
   518		}
   519	}
   520	

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