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Message-ID: <202505081548.9HldF62Y-lkp@intel.com>
Date: Thu, 8 May 2025 15:44:10 +0800
From: kernel test robot <lkp@...el.com>
To: Dan Williams <dan.j.williams@...el.com>, linux-cxl@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
Jonathan Cameron <jonathan.cameron@...wei.com>,
Dave Jiang <dave.jiang@...el.com>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH 6/7] cxl/region: Introduce CLASS(cxl_decoder_detach...)
consolidate multiple paths
Hi Dan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on b4432656b36e5cc1d50a1f2dc15357543add530e]
url: https://github.com/intel-lab-lkp/linux/commits/Dan-Williams/cleanup-Introduce-DEFINE_ACQUIRE-a-CLASS-for-conditional-locking/20250507-152728
base: b4432656b36e5cc1d50a1f2dc15357543add530e
patch link: https://lore.kernel.org/r/20250507072145.3614298-7-dan.j.williams%40intel.com
patch subject: [PATCH 6/7] cxl/region: Introduce CLASS(cxl_decoder_detach...) consolidate multiple paths
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20250508/202505081548.9HldF62Y-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250508/202505081548.9HldF62Y-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/202505081548.9HldF62Y-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/cxl/core/port.c:9:
In file included from include/linux/pci.h:38:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:549:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
549 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:567:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
567 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/cxl/core/port.c:9:
In file included from include/linux/pci.h:38:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:585:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/cxl/core/port.c:9:
In file included from include/linux/pci.h:38:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:601:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
601 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:616:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
616 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:631:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
631 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:724:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
724 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:737:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
737 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:750:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
750 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:764:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
764 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:778:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
778 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:792:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
792 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
In file included from drivers/cxl/core/port.c:17:
>> drivers/cxl/core/core.h:64:1: warning: non-void function does not return a value [-Wreturn-type]
64 | }
| ^
13 warnings generated.
vim +64 drivers/cxl/core/core.h
79ed8367834ee8 Dan Williams 2025-05-07 28
79ed8367834ee8 Dan Williams 2025-05-07 29 struct cxl_region *cxl_decoder_detach(struct cxl_region *cxlr,
79ed8367834ee8 Dan Williams 2025-05-07 30 struct cxl_endpoint_decoder *cxled,
79ed8367834ee8 Dan Williams 2025-05-07 31 int pos, enum cxl_detach_mode mode);
79ed8367834ee8 Dan Williams 2025-05-07 32
779dd20cfb56c5 Ben Widawsky 2021-06-08 33 #define CXL_REGION_ATTR(x) (&dev_attr_##x.attr)
8d48817df6ac20 Dan Williams 2021-06-15 34 #define CXL_REGION_TYPE(x) (&cxl_region_type)
779dd20cfb56c5 Ben Widawsky 2021-06-08 35 #define SET_CXL_REGION_ATTR(x) (&dev_attr_##x.attr),
04ad63f086d1a9 Dan Williams 2022-01-11 36 #define CXL_PMEM_REGION_TYPE(x) (&cxl_pmem_region_type)
09d09e04d2fcf8 Dan Williams 2023-02-10 37 #define CXL_DAX_REGION_TYPE(x) (&cxl_dax_region_type)
8d48817df6ac20 Dan Williams 2021-06-15 38 int cxl_region_init(void);
8d48817df6ac20 Dan Williams 2021-06-15 39 void cxl_region_exit(void);
f0832a58639691 Alison Schofield 2023-04-18 40 int cxl_get_poison_by_endpoint(struct cxl_port *port);
b98d042698a325 Alison Schofield 2024-04-30 41 struct cxl_region *cxl_dpa_to_region(const struct cxl_memdev *cxlmd, u64 dpa);
9aa5f6235e16ac Alison Schofield 2024-07-02 42 u64 cxl_dpa_to_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd,
86954ff5032d9d Alison Schofield 2024-04-30 43 u64 dpa);
b98d042698a325 Alison Schofield 2024-04-30 44
779dd20cfb56c5 Ben Widawsky 2021-06-08 45 #else
9aa5f6235e16ac Alison Schofield 2024-07-02 46 static inline u64 cxl_dpa_to_hpa(struct cxl_region *cxlr,
9aa5f6235e16ac Alison Schofield 2024-07-02 47 const struct cxl_memdev *cxlmd, u64 dpa)
86954ff5032d9d Alison Schofield 2024-04-30 48 {
86954ff5032d9d Alison Schofield 2024-04-30 49 return ULLONG_MAX;
86954ff5032d9d Alison Schofield 2024-04-30 50 }
b98d042698a325 Alison Schofield 2024-04-30 51 static inline
b98d042698a325 Alison Schofield 2024-04-30 52 struct cxl_region *cxl_dpa_to_region(const struct cxl_memdev *cxlmd, u64 dpa)
b98d042698a325 Alison Schofield 2024-04-30 53 {
b98d042698a325 Alison Schofield 2024-04-30 54 return NULL;
b98d042698a325 Alison Schofield 2024-04-30 55 }
f0832a58639691 Alison Schofield 2023-04-18 56 static inline int cxl_get_poison_by_endpoint(struct cxl_port *port)
f0832a58639691 Alison Schofield 2023-04-18 57 {
f0832a58639691 Alison Schofield 2023-04-18 58 return 0;
f0832a58639691 Alison Schofield 2023-04-18 59 }
79ed8367834ee8 Dan Williams 2025-05-07 60 static inline struct cxl_region *
79ed8367834ee8 Dan Williams 2025-05-07 61 cxl_decoder_detach(struct cxl_region *cxlr, struct cxl_endpoint_decoder *cxled,
79ed8367834ee8 Dan Williams 2025-05-07 62 int pos, enum cxl_detach_mode mode)
b9686e8c8e39d4 Dan Williams 2022-06-04 63 {
b9686e8c8e39d4 Dan Williams 2022-06-04 @64 }
8d48817df6ac20 Dan Williams 2021-06-15 65 static inline int cxl_region_init(void)
8d48817df6ac20 Dan Williams 2021-06-15 66 {
8d48817df6ac20 Dan Williams 2021-06-15 67 return 0;
8d48817df6ac20 Dan Williams 2021-06-15 68 }
8d48817df6ac20 Dan Williams 2021-06-15 69 static inline void cxl_region_exit(void)
8d48817df6ac20 Dan Williams 2021-06-15 70 {
8d48817df6ac20 Dan Williams 2021-06-15 71 }
779dd20cfb56c5 Ben Widawsky 2021-06-08 72 #define CXL_REGION_ATTR(x) NULL
8d48817df6ac20 Dan Williams 2021-06-15 73 #define CXL_REGION_TYPE(x) NULL
779dd20cfb56c5 Ben Widawsky 2021-06-08 74 #define SET_CXL_REGION_ATTR(x)
04ad63f086d1a9 Dan Williams 2022-01-11 75 #define CXL_PMEM_REGION_TYPE(x) NULL
09d09e04d2fcf8 Dan Williams 2023-02-10 76 #define CXL_DAX_REGION_TYPE(x) NULL
779dd20cfb56c5 Ben Widawsky 2021-06-08 77 #endif
779dd20cfb56c5 Ben Widawsky 2021-06-08 78
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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