Hi Andrii, kernel test robot noticed the following build errors: [auto build test ERROR on tip/perf/core] url: https://github.com/intel-lab-lkp/linux/commits/Andrii-Nakryiko/mm-introduce-mmap_lock_speculation_-start-end/20241002-065354 base: tip/perf/core patch link: https://lore.kernel.org/r/20241001225207.2215639-6-andrii%40kernel.org patch subject: [PATCH v2 tip/perf/core 5/5] uprobes: add speculative lockless VMA-to-inode-to-uprobe resolution config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20241005/202410050745.2Nuvusy4-lkp@xxxxxxxxx/config) compiler: loongarch64-linux-gcc (GCC) 14.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241005/202410050745.2Nuvusy4-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/202410050745.2Nuvusy4-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): kernel/events/uprobes.c: In function 'find_active_uprobe_speculative': >> kernel/events/uprobes.c:2098:46: error: passing argument 2 of 'mmap_lock_speculation_start' from incompatible pointer type [-Wincompatible-pointer-types] 2098 | if (!mmap_lock_speculation_start(mm, &seq)) | ^~~~ | | | long int * In file included from include/linux/mm.h:16, from arch/loongarch/include/asm/cacheflush.h:8, from include/linux/cacheflush.h:5, from include/linux/highmem.h:8, from kernel/events/uprobes.c:13: include/linux/mmap_lock.h:126:75: note: expected 'int *' but argument is of type 'long int *' 126 | static inline bool mmap_lock_speculation_start(struct mm_struct *mm, int *seq) { return false; } | ~~~~~^~~ vim +/mmap_lock_speculation_start +2098 kernel/events/uprobes.c 2086 2087 static struct uprobe *find_active_uprobe_speculative(unsigned long bp_vaddr) 2088 { 2089 struct mm_struct *mm = current->mm; 2090 struct uprobe *uprobe = NULL; 2091 struct vm_area_struct *vma; 2092 struct file *vm_file; 2093 loff_t offset; 2094 long seq; 2095 2096 guard(rcu)(); 2097 > 2098 if (!mmap_lock_speculation_start(mm, &seq)) 2099 return NULL; 2100 2101 vma = vma_lookup(mm, bp_vaddr); 2102 if (!vma) 2103 return NULL; 2104 2105 /* vm_file memory can be reused for another instance of struct file, 2106 * but can't be freed from under us, so it's safe to read fields from 2107 * it, even if the values are some garbage values; ultimately 2108 * find_uprobe_rcu() + mmap_lock_speculation_end() check will ensure 2109 * that whatever we speculatively found is correct 2110 */ 2111 vm_file = READ_ONCE(vma->vm_file); 2112 if (!vm_file) 2113 return NULL; 2114 2115 offset = (loff_t)(vma->vm_pgoff << PAGE_SHIFT) + (bp_vaddr - vma->vm_start); 2116 uprobe = find_uprobe_rcu(vm_file->f_inode, offset); 2117 if (!uprobe) 2118 return NULL; 2119 2120 /* now double check that nothing about MM changed */ 2121 if (!mmap_lock_speculation_end(mm, seq)) 2122 return NULL; 2123 2124 return uprobe; 2125 } 2126 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
