tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e3f80d3eae76c3557b3c9b5938ad01c0e6cf25ec commit: 5233d9beb1a81c08d8155b62df5e9635ee99ee27 [11986/12208] proc/ksm: add ksm stats to /proc/pid/smaps config: um-allyesconfig (https://download.01.org/0day-ci/archive/20230823/202308232225.dKxD5VzA-lkp@xxxxxxxxx/config) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1) reproduce: (https://download.01.org/0day-ci/archive/20230823/202308232225.dKxD5VzA-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202308232225.dKxD5VzA-lkp@xxxxxxxxx/ Note: the linux-next/master HEAD e3f80d3eae76c3557b3c9b5938ad01c0e6cf25ec builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): In file included from fs/proc/task_mmu.c:3: In file included from include/linux/mm_inline.h:7: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: 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: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 fs/proc/task_mmu.c:3: In file included from include/linux/mm_inline.h:7: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: 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: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 fs/proc/task_mmu.c:3: In file included from include/linux/mm_inline.h:7: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: 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: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); ~~~~~~~~~~ ^ >> fs/proc/task_mmu.c:457:33: error: implicit declaration of function 'is_ksm_zero_pte' is invalid in C99 [-Werror,-Wimplicit-function-declaration] if (PageKsm(page) && (!pte || !is_ksm_zero_pte(*pte))) ^ 12 warnings and 1 error generated. vim +/is_ksm_zero_pte +457 fs/proc/task_mmu.c 439 440 static void smaps_account(struct mem_size_stats *mss, pte_t *pte, 441 struct page *page, bool compound, bool young, bool dirty, 442 bool locked, bool migration) 443 { 444 int i, nr = compound ? compound_nr(page) : 1; 445 unsigned long size = nr * PAGE_SIZE; 446 447 /* 448 * First accumulate quantities that depend only on |size| and the type 449 * of the compound page. 450 */ 451 if (PageAnon(page)) { 452 mss->anonymous += size; 453 if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) 454 mss->lazyfree += size; 455 } 456 > 457 if (PageKsm(page) && (!pte || !is_ksm_zero_pte(*pte))) 458 mss->ksm += size; 459 460 mss->resident += size; 461 /* Accumulate the size in pages that have been accessed. */ 462 if (young || page_is_young(page) || PageReferenced(page)) 463 mss->referenced += size; 464 465 /* 466 * Then accumulate quantities that may depend on sharing, or that may 467 * differ page-by-page. 468 * 469 * page_count(page) == 1 guarantees the page is mapped exactly once. 470 * If any subpage of the compound page mapped with PTE it would elevate 471 * page_count(). 472 * 473 * The page_mapcount() is called to get a snapshot of the mapcount. 474 * Without holding the page lock this snapshot can be slightly wrong as 475 * we cannot always read the mapcount atomically. It is not safe to 476 * call page_mapcount() even with PTL held if the page is not mapped, 477 * especially for migration entries. Treat regular migration entries 478 * as mapcount == 1. 479 */ 480 if ((page_count(page) == 1) || migration) { 481 smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty, 482 locked, true); 483 return; 484 } 485 for (i = 0; i < nr; i++, page++) { 486 int mapcount = page_mapcount(page); 487 unsigned long pss = PAGE_SIZE << PSS_SHIFT; 488 if (mapcount >= 2) 489 pss /= mapcount; 490 smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked, 491 mapcount < 2); 492 } 493 } 494 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
