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McKenney" CC: Boqun Feng tree: https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git srcu.2025.02.04a head: 3f3deb5de0d5b93457c54a784f55fa82c0e17148 commit: 660b0e66d9927f84f59027602de07bb07754b8f7 [12/19] srcu: Add SRCU-fast readers :::::: branch date: 9 days ago :::::: commit date: 9 days ago config: arm64-randconfig-r073-20250214 (https://download.01.org/0day-ci/archive/20250214/202502141906.jAZQbTVd-lkp@intel.com/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202502141906.jAZQbTVd-lkp@intel.com/ smatch warnings: mm/msync.c:90 __do_sys_msync() warn: comparison of a potentially tagged address (__do_sys_msync, -2, __UNIQUE_ID_x_663) mm/msync.c:90 __do_sys_msync() warn: comparison of a potentially tagged address (__do_sys_msync, -2, __UNIQUE_ID_x_663) vim +90 mm/msync.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 17 ^1da177e4c3f41 Linus Torvalds 2005-04-16 18 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 19 * MS_SYNC syncs the entire file - including mappings. ^1da177e4c3f41 Linus Torvalds 2005-04-16 20 * 204ec841fbea3e Peter Zijlstra 2006-09-25 21 * MS_ASYNC does not start I/O (it used to, up to 2.5.67). 204ec841fbea3e Peter Zijlstra 2006-09-25 22 * Nor does it marks the relevant pages dirty (it used to up to 2.6.17). 204ec841fbea3e Peter Zijlstra 2006-09-25 23 * Now it doesn't do anything, since dirty pages are properly tracked. 204ec841fbea3e Peter Zijlstra 2006-09-25 24 * 204ec841fbea3e Peter Zijlstra 2006-09-25 25 * The application may now run fsync() to ^1da177e4c3f41 Linus Torvalds 2005-04-16 26 * write out the dirty pages and wait on the writeout and check the result. ^1da177e4c3f41 Linus Torvalds 2005-04-16 27 * Or the application may run fadvise(FADV_DONTNEED) against the fd to start ^1da177e4c3f41 Linus Torvalds 2005-04-16 28 * async writeout immediately. 16538c40776b8b Amos Waterland 2006-03-24 29 * So by _not_ starting I/O in MS_ASYNC we provide complete flexibility to ^1da177e4c3f41 Linus Torvalds 2005-04-16 30 * applications. ^1da177e4c3f41 Linus Torvalds 2005-04-16 31 */ 6a6160a7b5c27b Heiko Carstens 2009-01-14 32 SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) ^1da177e4c3f41 Linus Torvalds 2005-04-16 33 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 34 unsigned long end; 204ec841fbea3e Peter Zijlstra 2006-09-25 35 struct mm_struct *mm = current->mm; ^1da177e4c3f41 Linus Torvalds 2005-04-16 36 struct vm_area_struct *vma; 676758bdb7bfca Andrew Morton 2006-03-24 37 int unmapped_error = 0; 676758bdb7bfca Andrew Morton 2006-03-24 38 int error = -EINVAL; ^1da177e4c3f41 Linus Torvalds 2005-04-16 39 057d3389108eda Andrey Konovalov 2019-09-25 40 start = untagged_addr(start); 057d3389108eda Andrey Konovalov 2019-09-25 41 ^1da177e4c3f41 Linus Torvalds 2005-04-16 42 if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 43 goto out; b0d61c7e56815b Alexander Kuleshov 2015-11-05 44 if (offset_in_page(start)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 45 goto out; ^1da177e4c3f41 Linus Torvalds 2005-04-16 46 if ((flags & MS_ASYNC) && (flags & MS_SYNC)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 47 goto out; ^1da177e4c3f41 Linus Torvalds 2005-04-16 48 error = -ENOMEM; ^1da177e4c3f41 Linus Torvalds 2005-04-16 49 len = (len + ~PAGE_MASK) & PAGE_MASK; ^1da177e4c3f41 Linus Torvalds 2005-04-16 50 end = start + len; ^1da177e4c3f41 Linus Torvalds 2005-04-16 51 if (end < start) ^1da177e4c3f41 Linus Torvalds 2005-04-16 52 goto out; ^1da177e4c3f41 Linus Torvalds 2005-04-16 53 error = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 54 if (end == start) ^1da177e4c3f41 Linus Torvalds 2005-04-16 55 goto out; ^1da177e4c3f41 Linus Torvalds 2005-04-16 56 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 57 * If the interval [start,end) covers some unmapped address ranges, f6899bc03cbadc Nikita Ermakov 2021-04-29 58 * just ignore them, but return -ENOMEM at the end. Besides, if the f6899bc03cbadc Nikita Ermakov 2021-04-29 59 * flag is MS_ASYNC (w/o MS_INVALIDATE) the result would be -ENOMEM f6899bc03cbadc Nikita Ermakov 2021-04-29 60 * anyway and there is nothing left to do, so return immediately. ^1da177e4c3f41 Linus Torvalds 2005-04-16 61 */ d8ed45c5dcd455 Michel Lespinasse 2020-06-08 62 mmap_read_lock(mm); 204ec841fbea3e Peter Zijlstra 2006-09-25 63 vma = find_vma(mm, start); 204ec841fbea3e Peter Zijlstra 2006-09-25 64 for (;;) { 9c50823eebf7c2 Andrew Morton 2006-03-24 65 struct file *file; 7fc34a62ca4434 Matthew Wilcox 2014-06-04 66 loff_t fstart, fend; 9c50823eebf7c2 Andrew Morton 2006-03-24 67 204ec841fbea3e Peter Zijlstra 2006-09-25 68 /* Still start < end. */ 204ec841fbea3e Peter Zijlstra 2006-09-25 69 error = -ENOMEM; 204ec841fbea3e Peter Zijlstra 2006-09-25 70 if (!vma) 204ec841fbea3e Peter Zijlstra 2006-09-25 71 goto out_unlock; ^1da177e4c3f41 Linus Torvalds 2005-04-16 72 /* Here start < vma->vm_end. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 73 if (start < vma->vm_start) { f6899bc03cbadc Nikita Ermakov 2021-04-29 74 if (flags == MS_ASYNC) f6899bc03cbadc Nikita Ermakov 2021-04-29 75 goto out_unlock; ^1da177e4c3f41 Linus Torvalds 2005-04-16 76 start = vma->vm_start; 204ec841fbea3e Peter Zijlstra 2006-09-25 77 if (start >= end) 9c50823eebf7c2 Andrew Morton 2006-03-24 78 goto out_unlock; 204ec841fbea3e Peter Zijlstra 2006-09-25 79 unmapped_error = -ENOMEM; ^1da177e4c3f41 Linus Torvalds 2005-04-16 80 } 204ec841fbea3e Peter Zijlstra 2006-09-25 81 /* Here vma->vm_start <= start < vma->vm_end. */ 204ec841fbea3e Peter Zijlstra 2006-09-25 82 if ((flags & MS_INVALIDATE) && 204ec841fbea3e Peter Zijlstra 2006-09-25 83 (vma->vm_flags & VM_LOCKED)) { 204ec841fbea3e Peter Zijlstra 2006-09-25 84 error = -EBUSY; 9c50823eebf7c2 Andrew Morton 2006-03-24 85 goto out_unlock; 9c50823eebf7c2 Andrew Morton 2006-03-24 86 } 9c50823eebf7c2 Andrew Morton 2006-03-24 87 file = vma->vm_file; 496a8e68654a5f Namjae Jeon 2014-07-02 88 fstart = (start - vma->vm_start) + 496a8e68654a5f Namjae Jeon 2014-07-02 89 ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 7fc34a62ca4434 Matthew Wilcox 2014-06-04 @90 fend = fstart + (min(end, vma->vm_end) - start) - 1; :::::: The code at line 90 was first introduced by commit :::::: 7fc34a62ca4434a79c68e23e70ed26111b7a4cf8 mm/msync.c: sync only the requested range in msync() :::::: TO: Matthew Wilcox :::::: CC: Linus Torvalds -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki