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Date: Sat, 22 Oct 2022 19:00:38 +0800
From: kernel test robot <lkp@...el.com>
To: Lijo Lazar <lijo.lazar@....com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org,
Alex Deucher <alexander.deucher@....com>,
Guchun Chen <guchun.chen@....com>
Subject: [agd5f:drm-next 41/66]
drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:686:3: warning: variable 'data' is
uninitialized when used here
tree: https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head: fb5e487f910e1105019b883e8ed25e36e4bfd657
commit: 7a4fad619819f62fad155d11e602ee3093f75d2c [41/66] drm/amdgpu: Remove ATC L2 access for MMHUB 2.1.x
config: s390-randconfig-r024-20221019
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
git fetch --no-tags agd5f drm-next
git checkout 7a4fad619819f62fad155d11e602ee3093f75d2c
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:24:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:24:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:24:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:686:3: warning: variable 'data' is uninitialized when used here [-Wuninitialized]
data |= MM_ATC_L2_MISC_CG__ENABLE_MASK;
^~~~
drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c:674:10: note: initialize the variable 'data' to silence this warning
int data, data1;
^
= 0
13 warnings generated.
vim +/data +686 drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
671
672 static void mmhub_v2_0_get_clockgating(struct amdgpu_device *adev, u64 *flags)
673 {
674 int data, data1;
675
676 if (amdgpu_sriov_vf(adev))
677 *flags = 0;
678
679 switch (adev->ip_versions[MMHUB_HWIP][0]) {
680 case IP_VERSION(2, 1, 0):
681 case IP_VERSION(2, 1, 1):
682 case IP_VERSION(2, 1, 2):
683 /* There is no ATCL2 in MMHUB for 2.1.x. Keep the status
684 * based on DAGB
685 */
> 686 data |= MM_ATC_L2_MISC_CG__ENABLE_MASK;
687 data1 = RREG32_SOC15(MMHUB, 0, mmDAGB0_CNTL_MISC2_Sienna_Cichlid);
688 break;
689 default:
690 data = RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG);
691 data1 = RREG32_SOC15(MMHUB, 0, mmDAGB0_CNTL_MISC2);
692 break;
693 }
694
695 /* AMD_CG_SUPPORT_MC_MGCG */
696 if ((data & MM_ATC_L2_MISC_CG__ENABLE_MASK) &&
697 !(data1 & (DAGB0_CNTL_MISC2__DISABLE_WRREQ_CG_MASK |
698 DAGB0_CNTL_MISC2__DISABLE_WRRET_CG_MASK |
699 DAGB0_CNTL_MISC2__DISABLE_RDREQ_CG_MASK |
700 DAGB0_CNTL_MISC2__DISABLE_RDRET_CG_MASK |
701 DAGB0_CNTL_MISC2__DISABLE_TLBWR_CG_MASK |
702 DAGB0_CNTL_MISC2__DISABLE_TLBRD_CG_MASK)))
703 *flags |= AMD_CG_SUPPORT_MC_MGCG;
704
705 /* AMD_CG_SUPPORT_MC_LS */
706 if (data & MM_ATC_L2_MISC_CG__MEM_LS_ENABLE_MASK)
707 *flags |= AMD_CG_SUPPORT_MC_LS;
708 }
709
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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