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Message-ID: <7986a0a9-79c7-46b9-8227-ebf8835ef08f@vivo.com>
Date: Wed, 31 Jul 2024 21:42:55 +0800
From: zhiguojiang <justinjiang@...o.com>
To: kernel test robot <lkp@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
Will Deacon <will@...nel.org>, "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
Nick Piggin <npiggin@...nel.dk>, Peter Zijlstra <peterz@...radead.org>,
Arnd Bergmann <arnd@...db.de>, Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>,
Shakeel Butt <shakeel.butt@...ux.dev>, Muchun Song <muchun.song@...ux.dev>,
linux-arch@...r.kernel.org, cgroups@...r.kernel.org,
Barry Song <21cnbao@...il.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Linux Memory Management List <linux-mm@...ck.org>, opensource.kernel@...o.com
Subject: Re: [PATCH 2/2] mm: tlb: add tlb swap entries batch async release
在 2024/7/31 17:55, kernel test robot 写道:
> [Some people who received this message don't often get email from lkp@...el.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>
> Hi Zhiguo,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on akpm-mm/mm-everything]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Zhiguo-Jiang/mm-move-task_is_dying-to-h-headfile/20240730-215136
> base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link: https://lore.kernel.org/r/20240730114426.511-3-justinjiang%40vivo.com
> patch subject: [PATCH 2/2] mm: tlb: add tlb swap entries batch async release
> config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20240731/202407311703.8q8sDQ2p-lkp@intel.com/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project ccae7b461be339e717d02f99ac857cf0bc7d17fc)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240731/202407311703.8q8sDQ2p-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/202407311703.8q8sDQ2p-lkp@intel.com/
Hi,
I have fixed the arch s390 config compilation warning in v2. Please
kindly help to test again.
https://lore.kernel.org/linux-mm/20240731133318.527-1-justinjiang@vivo.com/T/#t
Thanks
> All error/warnings (new ones prefixed by >>):
>
> In file included from arch/s390/mm/init.c:17:
> In file included from include/linux/ptrace.h:10:
> In file included from include/linux/pid_namespace.h:7:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from arch/s390/mm/init.c:25:
> In file included from include/linux/memblock.h:13:
> In file included from arch/s390/include/asm/dma.h:5:
> In file included from include/linux/io.h:14:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 548 | val = __raw_readb(PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 561 | 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'
> 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
> | ^
> include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
> 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
> | ^
> In file included from arch/s390/mm/init.c:25:
> In file included from include/linux/memblock.h:13:
> In file included from arch/s390/include/asm/dma.h:5:
> In file included from include/linux/io.h:14:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 574 | 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'
> 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
> | ^
> include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
> 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
> | ^
> In file included from arch/s390/mm/init.c:25:
> In file included from include/linux/memblock.h:13:
> In file included from arch/s390/include/asm/dma.h:5:
> In file included from include/linux/io.h:14:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 585 | __raw_writeb(value, PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 693 | readsb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 701 | readsw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 709 | readsl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 718 | writesb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 727 | writesw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 736 | writesl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> In file included from arch/s390/mm/init.c:42:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> 14 warnings generated.
> --
> In file included from arch/s390/mm/pgtable.c:11:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from arch/s390/mm/pgtable.c:22:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> 2 warnings generated.
> --
> In file included from mm/memory.c:44:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from mm/memory.c:45:
> include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~ ^ ~~~
> include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 49 | NR_ZONE_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~~~~~~ ^ ~~~
> In file included from mm/memory.c:84:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 548 | val = __raw_readb(PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 561 | 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'
> 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
> | ^
> include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
> 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
> | ^
> In file included from mm/memory.c:84:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 574 | 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'
> 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
> | ^
> include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
> 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
> | ^
> In file included from mm/memory.c:84:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 585 | __raw_writeb(value, PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 693 | readsb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 701 | readsw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 709 | readsl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 718 | writesb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 727 | writesw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 736 | writesl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> In file included from mm/memory.c:88:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> 16 warnings generated.
> --
> In file included from mm/mmap.c:14:
> In file included from include/linux/backing-dev.h:15:
> In file included from include/linux/device.h:32:
> In file included from include/linux/device/driver.h:21:
> In file included from include/linux/module.h:19:
> In file included from include/linux/elf.h:6:
> In file included from arch/s390/include/asm/elf.h:181:
> In file included from arch/s390/include/asm/mmu_context.h:11:
> In file included from arch/s390/include/asm/pgalloc.h:18:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from mm/mmap.c:16:
> include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~ ^ ~~~
> include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 49 | NR_ZONE_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~~~~~~ ^ ~~~
> In file included from mm/mmap.c:53:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> 4 warnings generated.
> --
> In file included from mm/mremap.c:11:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from mm/mremap.c:12:
> include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~ ^ ~~~
> include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 49 | NR_ZONE_LRU_BASE + lru, nr_pages);
> | ~~~~~~~~~~~~~~~~ ^ ~~~
> In file included from mm/mremap.c:30:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> mm/mremap.c:228:20: warning: unused function 'arch_supports_page_table_move' [-Wunused-function]
> 228 | static inline bool arch_supports_page_table_move(void)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> mm/mremap.c:227:39: note: expanded from macro 'arch_supports_page_table_move'
> 227 | #define arch_supports_page_table_move arch_supports_page_table_move
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 5 warnings generated.
> --
> In file included from kernel/sched/core.c:10:
> In file included from include/linux/highmem.h:10:
> In file included from include/linux/mm.h:2234:
> include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
> 514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
> | ~~~~~~~~~~~ ^ ~~~
> In file included from kernel/sched/core.c:34:
> In file included from include/linux/sched/isolation.h:7:
> In file included from include/linux/tick.h:8:
> In file included from include/linux/clockchips.h:14:
> In file included from include/linux/clocksource.h:22:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 548 | val = __raw_readb(PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 561 | 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'
> 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
> | ^
> include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
> 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
> | ^
> In file included from kernel/sched/core.c:34:
> In file included from include/linux/sched/isolation.h:7:
> In file included from include/linux/tick.h:8:
> In file included from include/linux/clockchips.h:14:
> In file included from include/linux/clocksource.h:22:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 574 | 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'
> 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
> | ^
> include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
> 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
> | ^
> In file included from kernel/sched/core.c:34:
> In file included from include/linux/sched/isolation.h:7:
> In file included from include/linux/tick.h:8:
> In file included from include/linux/clockchips.h:14:
> In file included from include/linux/clocksource.h:22:
> In file included from arch/s390/include/asm/io.h:93:
> include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 585 | __raw_writeb(value, PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 693 | readsb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 701 | readsw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 709 | readsl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 718 | writesb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 727 | writesw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 736 | writesl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> In file included from kernel/sched/core.c:80:
> In file included from arch/s390/include/asm/tlb.h:39:
>>> include/asm-generic/tlb.h:327:6: warning: no previous prototype for function '__tlb_remove_swap_entries' [-Wmissing-prototypes]
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> include/asm-generic/tlb.h:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> 327 | bool __tlb_remove_swap_entries(struct mmu_gather *tlb,
> | ^
> | static
> kernel/sched/core.c:6330:20: warning: unused function 'sched_core_cpu_deactivate' [-Wunused-function]
> 6330 | static inline void sched_core_cpu_deactivate(unsigned int cpu) {}
> | ^~~~~~~~~~~~~~~~~~~~~~~~~
> 15 warnings generated.
> ..
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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