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Date: Fri, 15 Sep 2023 08:10:56 +0000
From: Justin He <Justin.He@....com>
To: kernel test robot <lkp@...el.com>, Christoph Hellwig <hch@....de>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Robin Murphy <Robin.Murphy@....com>,
"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
CC: "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
"oe-kbuild-all@...ts.linux.dev" <oe-kbuild-all@...ts.linux.dev>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
nd <nd@....com>
Subject: RE: [PATCH] dma-mapping: fix dma_addressing_limited if dma_range_map
is scanned
> -----Original Message-----
> From: kernel test robot <lkp@...el.com>
> Sent: Wednesday, September 13, 2023 2:28 AM
> To: Justin He <Justin.He@....com>; Christoph Hellwig <hch@....de>; Marek
> Szyprowski <m.szyprowski@...sung.com>; Robin Murphy
> <Robin.Murphy@....com>; iommu@...ts.linux.dev
> Cc: llvm@...ts.linux.dev; oe-kbuild-all@...ts.linux.dev;
> linux-kernel@...r.kernel.org; Justin He <Justin.He@....com>
> Subject: Re: [PATCH] dma-mapping: fix dma_addressing_limited if
> dma_range_map is scanned
>
> Hi Jia,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v6.6-rc1 next-20230912] [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/Jia-He/dma-mapping-fix-dma_
> addressing_limited-if-dma_range_map-is-scanned/20230912-164126
> base: linus/master
> patch link:
> https://lore.kernel.org/r/20230912084002.2168-1-justin.he%40arm.com
> patch subject: [PATCH] dma-mapping: fix dma_addressing_limited if
> dma_range_map is scanned
> config: um-allyesconfig
> (https://download.01.org/0day-ci/archive/20230913/202309130234.COIfUg9
> W-lkp@...el.com/config)
> compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git
> f28c006a5895fc0e329fe15fead81e37457cb1d1)
> reproduce (this is a W=1 build):
> (https://download.01.org/0day-ci/archive/20230913/202309130234.COIfUg9
> W-lkp@...el.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/202309130234.COIfUg9W-lkp@intel.
> | com/
>
> All errors (new ones prefixed by >>):
>
> In file included from init/main.c:21:
> In file included from include/linux/syscalls.h:90:
> In file included from include/trace/syscall.h:7:
> In file included from include/linux/trace_events.h:9:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:37:51: note: expanded from
> macro '__le16_to_cpu'
> #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
> ^
> In file included from init/main.c:21:
> In file included from include/linux/syscalls.h:90:
> In file included from include/trace/syscall.h:7:
> In file included from include/linux/trace_events.h:9:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:35:51: note: expanded from
> macro '__le32_to_cpu'
> #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
> ^
> In file included from init/main.c:21:
> In file included from include/linux/syscalls.h:90:
> In file included from include/trace/syscall.h:7:
> In file included from include/linux/trace_events.h:9:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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);
> ~~~~~~~~~~ ^
> In file included from init/main.c:102:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:28:
> >> include/linux/dma-mapping.h:483:10: error: implicit declaration of
> >> function 'all_ram_in_dma_range_map' is invalid in C99
> >> [-Werror,-Wimplicit-function-declaration]
> return !all_ram_in_dma_range_map(dev);
Seems I need to define a stub when DMA Kconfig is disabled.
Thanks
--
Cheers,
Justin (Jia He)
> ^
> 12 warnings and 1 error generated.
> --
> In file included from arch/um/os-Linux/drivers/ethertap_kern.c:10:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:37:51: note: expanded from
> macro '__le16_to_cpu'
> #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
> ^
> In file included from arch/um/os-Linux/drivers/ethertap_kern.c:10:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:35:51: note: expanded from
> macro '__le32_to_cpu'
> #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
> ^
> In file included from arch/um/os-Linux/drivers/ethertap_kern.c:10:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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);
> ~~~~~~~~~~ ^
> In file included from arch/um/os-Linux/drivers/ethertap_kern.c:10:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:28:
> >> include/linux/dma-mapping.h:483:10: error: implicit declaration of
> >> function 'all_ram_in_dma_range_map' is invalid in C99
> >> [-Werror,-Wimplicit-function-declaration]
> return !all_ram_in_dma_range_map(dev);
> ^
> arch/um/os-Linux/drivers/ethertap_kern.c:66:5: warning: no previous
> prototype for function 'ethertap_setup' [-Wmissing-prototypes]
> int ethertap_setup(char *str, char **mac_out, void *data)
> ^
> arch/um/os-Linux/drivers/ethertap_kern.c:66:1: note: declare 'static' if the
> function is not intended to be used outside of this translation unit
> int ethertap_setup(char *str, char **mac_out, void *data)
> ^
> static
> 13 warnings and 1 error generated.
> --
> In file included from arch/um/os-Linux/drivers/tuntap_kern.c:6:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:37:51: note: expanded from
> macro '__le16_to_cpu'
> #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
> ^
> In file included from arch/um/os-Linux/drivers/tuntap_kern.c:6:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:35:51: note: expanded from
> macro '__le32_to_cpu'
> #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
> ^
> In file included from arch/um/os-Linux/drivers/tuntap_kern.c:6:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:17:
> In file included from include/linux/bvec.h:10:
> In file included from include/linux/highmem.h:12:
> 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:13:
> In file included from arch/um/include/asm/io.h:24:
> 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);
> ~~~~~~~~~~ ^
> In file included from arch/um/os-Linux/drivers/tuntap_kern.c:6:
> In file included from include/linux/netdevice.h:38:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:28:
> >> include/linux/dma-mapping.h:483:10: error: implicit declaration of
> >> function 'all_ram_in_dma_range_map' is invalid in C99
> >> [-Werror,-Wimplicit-function-declaration]
> return !all_ram_in_dma_range_map(dev);
> ^
> arch/um/os-Linux/drivers/tuntap_kern.c:56:5: warning: no previous
> prototype for function 'tuntap_setup' [-Wmissing-prototypes]
> int tuntap_setup(char *str, char **mac_out, void *data)
> ^
> arch/um/os-Linux/drivers/tuntap_kern.c:56:1: note: declare 'static' if the
> function is not intended to be used outside of this translation unit
> int tuntap_setup(char *str, char **mac_out, void *data)
> ^
> static
> 13 warnings and 1 error generated.
> --
> In file included from net/ipv4/route.c:67:
> In file included from include/linux/memblock.h:13:
> In file included from arch/um/include/asm/dma.h:5:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:37:51: note: expanded from
> macro '__le16_to_cpu'
> #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
> ^
> In file included from net/ipv4/route.c:67:
> In file included from include/linux/memblock.h:13:
> In file included from arch/um/include/asm/dma.h:5:
> In file included from arch/um/include/asm/io.h:24:
> 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/little_endian.h:35:51: note: expanded from
> macro '__le32_to_cpu'
> #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
> ^
> In file included from net/ipv4/route.c:67:
> In file included from include/linux/memblock.h:13:
> In file included from arch/um/include/asm/dma.h:5:
> In file included from arch/um/include/asm/io.h:24:
> 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);
> ~~~~~~~~~~ ^
> In file included from net/ipv4/route.c:71:
> In file included from include/linux/inet.h:42:
> In file included from include/net/net_namespace.h:43:
> In file included from include/linux/skbuff.h:28:
> >> include/linux/dma-mapping.h:483:10: error: implicit declaration of
> >> function 'all_ram_in_dma_range_map' is invalid in C99
> >> [-Werror,-Wimplicit-function-declaration]
> return !all_ram_in_dma_range_map(dev);
> ^
> net/ipv4/route.c:880:6: warning: variable 'log_martians' set but not used
> [-Wunused-but-set-variable]
> int log_martians;
> ^
> 13 warnings and 1 error generated.
> ..
>
>
> vim +/all_ram_in_dma_range_map +483 include/linux/dma-mapping.h
>
> 468
> 469 /**
> 470 * dma_addressing_limited - return if the device is addressing
> limited
> 471 * @dev: device to check
> 472 *
> 473 * Return %true if the devices DMA mask is too small to address all
> memory in
> 474 * the system, else %false. Lack of addressing bits is the prime
> reason for
> 475 * bounce buffering, but might not be the only one.
> 476 */
> 477 static inline bool dma_addressing_limited(struct device *dev)
> 478 {
> 479 if (min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
> 480 dma_get_required_mask(dev))
> 481 return true;
> 482
> > 483 return !all_ram_in_dma_range_map(dev);
> 484 }
> 485
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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