tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 719136e5c24768ebdf80b9daa53facebbdd377c3 commit: 825ebc8e4bf948e5ab9a7e34f882f57285328204 [8222/8507] fs/proc/task_mmu: hide unused pagemap_scan_backout_range() function config: um-allyesconfig (https://download.01.org/0day-ci/archive/20230929/202309291010.EtzzK0Fp-lkp@xxxxxxxxx/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/20230929/202309291010.EtzzK0Fp-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/202309291010.EtzzK0Fp-lkp@xxxxxxxxx/ Note: the linux-next/master HEAD 719136e5c24768ebdf80b9daa53facebbdd377c3 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:2153:8: error: implicit declaration of function 'pagemap_scan_is_interesting_page' is invalid in C99 [-Werror,-Wimplicit-function-declaration] if (!pagemap_scan_is_interesting_page(categories, p)) ^ fs/proc/task_mmu.c:2153:8: note: did you mean 'pagemap_scan_is_interesting_vma'? fs/proc/task_mmu.c:1972:13: note: 'pagemap_scan_is_interesting_vma' declared here static bool pagemap_scan_is_interesting_vma(unsigned long categories, ^ fs/proc/task_mmu.c:2249:15: error: implicit declaration of function 'pagemap_scan_is_interesting_page' is invalid in C99 [-Werror,-Wimplicit-function-declaration] if (!vma || !pagemap_scan_is_interesting_page(p->cur_vma_category, p)) ^ 12 warnings and 2 errors generated. vim +/pagemap_scan_is_interesting_page +2153 fs/proc/task_mmu.c fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2121 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2122 static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2123 unsigned long end, struct mm_walk *walk) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2124 { fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2125 struct pagemap_scan_private *p = walk->private; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2126 struct vm_area_struct *vma = walk->vma; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2127 unsigned long addr, flush_end = 0; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2128 pte_t *pte, *start_pte; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2129 spinlock_t *ptl; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2130 int ret; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2131 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2132 arch_enter_lazy_mmu_mode(); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2133 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2134 ret = pagemap_scan_thp_entry(pmd, start, end, walk); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2135 if (ret != -ENOENT) { fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2136 arch_leave_lazy_mmu_mode(); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2137 return ret; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2138 } fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2139 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2140 ret = 0; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2141 start_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, start, &ptl); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2142 if (!pte) { fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2143 arch_leave_lazy_mmu_mode(); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2144 walk->action = ACTION_AGAIN; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2145 return 0; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2146 } fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2147 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2148 for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2149 unsigned long categories = p->cur_vma_category | fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2150 pagemap_page_category(p, vma, addr, ptep_get(pte)); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2151 unsigned long next = addr + PAGE_SIZE; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2152 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 @2153 if (!pagemap_scan_is_interesting_page(categories, p)) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2154 continue; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2155 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2156 ret = pagemap_scan_output(categories, p, addr, &next); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2157 if (next == addr) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2158 break; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2159 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2160 if (~p->arg.flags & PM_SCAN_WP_MATCHING) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2161 continue; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2162 if (~categories & PAGE_IS_WRITTEN) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2163 continue; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2164 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2165 make_uffd_wp_pte(vma, addr, pte); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2166 if (!flush_end) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2167 start = addr; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2168 flush_end = next; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2169 } fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2170 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2171 if (flush_end) fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2172 flush_tlb_range(vma, start, addr); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2173 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2174 pte_unmap_unlock(start_pte, ptl); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2175 arch_leave_lazy_mmu_mode(); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2176 fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2177 cond_resched(); fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2178 return ret; fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2179 } fef1d15288b455 Muhammad Usama Anjum 2023-08-21 2180 :::::: The code at line 2153 was first introduced by commit :::::: fef1d15288b455d957cdee6ebf8118b525872bde fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs :::::: TO: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx> :::::: CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
