tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 03c9c649e6f28e26260d276ce755f785b2435da3 commit: f01eef756655bd5f66bd1e3770da92e31982556d [13/13] uburma: introduce uburma basic types and helper functions config: arm64-randconfig-004-20251226 (https://download.01.org/0day-ci/archive/20251228/202512282153.oGLU3b14-lkp@i...) compiler: aarch64-linux-gcc (GCC) 13.4.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251228/202512282153.oGLU3b14-lkp@i...) 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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202512282153.oGLU3b14-lkp@intel.com/ All warnings (new ones prefixed by >>):

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drivers/ub/urma/uburma/uburma_mmap.c:20:6: warning: no previous prototype for 'uburma_umap_priv_init' [-Wmissing-prototypes] 20 | void uburma_umap_priv_init(struct uburma_umap_priv *priv, | ^~~~~~~~~~~~~~~~~~~~~ drivers/ub/urma/uburma/uburma_mmap.c:33:6: warning: no previous prototype for 'uburma_unmap_vma_pages' [-Wmissing-prototypes] 33 | void uburma_unmap_vma_pages(struct uburma_file *ufile) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/ub/urma/uburma/uburma_mmap.c:169:36: warning: no previous prototype for 'uburma_get_umap_ops' [-Wmissing-prototypes] 169 | const struct vm_operations_struct *uburma_get_umap_ops(void) | ^~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for RESCTRL_FS Depends on [n]: MISC_FILESYSTEMS [=n] && ARCH_HAS_CPU_RESCTRL [=y] Selected by [y]: - ARM64_MPAM [=y] vim +/uburma_umap_priv_init +20 drivers/ub/urma/uburma/uburma_mmap.c 19

20 void uburma_umap_priv_init(struct uburma_umap_priv *priv, 21 struct vm_area_struct *vma) 22 { 23 struct uburma_file *ufile = vma->vm_file->private_data; 24 25 priv->vma = vma; 26 vma->vm_private_data = priv; 27 28 mutex_lock(&ufile->umap_mutex); 29 list_add(&priv->node, &ufile->umaps_list); 30 mutex_unlock(&ufile->umap_mutex); 31 } 32 33 void uburma_unmap_vma_pages(struct uburma_file *ufile) 34 { 35 struct uburma_umap_priv *priv, *next_priv; 36 struct mm_struct *mm; 37 38 if (list_empty(&ufile->umaps_list)) 39 return; 40 41 lockdep_assert_held(&ufile->cleanup_rwsem); 42 while (1) { 43 struct list_head local_list; 44 45 INIT_LIST_HEAD(&local_list); 46 mm = NULL; 47 mutex_lock(&ufile->umap_mutex); 48 list_for_each_entry_safe(priv, next_priv, &ufile->umaps_list, 49 node) { 50 struct mm_struct *curr_mm = priv->vma->vm_mm; 51 52 if (!mm) { 53 if (!mmget_not_zero(curr_mm)) { 54 list_del_init(&priv->node); 55 continue; 56 } 57 mm = curr_mm; 58 list_move_tail(&priv->node, &local_list); 59 } else if (curr_mm == mm) { 60 list_move_tail(&priv->node, &local_list); 61 } 62 } 63 mutex_unlock(&ufile->umap_mutex); 64 65 if (list_empty(&local_list)) { 66 if (mm) 67 mmput(mm); 68 return; 69 } 70 71 mmap_read_lock(mm); 72 73 list_for_each_entry_safe(priv, next_priv, &local_list, node) { 74 struct vm_area_struct *vma = priv->vma; 75 76 list_del_init(&priv->node); 77 if (vma->vm_mm == mm) 78 zap_vma_ptes(vma, vma->vm_start, 79 vma->vm_end - vma->vm_start); 80 } 81 mmap_read_unlock(mm); 82 83 mmput(mm); 84 } 85 } 86 87 static void uburma_umap_open(struct vm_area_struct *vma) 88 { 89 struct uburma_file *ufile = vma->vm_file->private_data; 90 struct uburma_umap_priv *priv; 91 92 if (!down_read_trylock(&ufile->cleanup_rwsem)) 93 goto out_zap; 94 95 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 96 if (!priv) 97 goto out_unlock; 98 99 uburma_umap_priv_init(priv, vma); 100 101 up_read(&ufile->cleanup_rwsem); 102 return; 103 104 out_unlock: 105 up_read(&ufile->cleanup_rwsem); 106 out_zap: 107 vma->vm_private_data = NULL; 108 zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); 109 } 110 111 static void uburma_umap_close(struct vm_area_struct *vma) 112 { 113 struct uburma_file *ufile = vma->vm_file->private_data; 114 struct uburma_umap_priv *priv = vma->vm_private_data; 115 116 if (!priv) 117 return; 118 119 mutex_lock(&ufile->umap_mutex); 120 list_del(&priv->node); 121 mutex_unlock(&ufile->umap_mutex); 122 kfree(priv); 123 vma->vm_private_data = NULL; 124 } 125 126 static vm_fault_t uburma_umap_fault(struct vm_fault *vmf) 127 { 128 struct uburma_file *ufile = vmf->vma->vm_file->private_data; 129 struct uburma_umap_priv *priv = vmf->vma->vm_private_data; 130 struct page *page; 131 132 if (unlikely(!priv)) 133 return VM_FAULT_SIGBUS; 134 135 if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) { 136 vmf->page = ZERO_PAGE(0); 137 get_page(vmf->page); 138 return 0; 139 } 140 141 page = READ_ONCE(ufile->fault_page); 142 if (likely(page)) { 143 vmf->page = page; 144 get_page(vmf->page); 145 return 0; 146 } 147 148 mutex_lock(&ufile->umap_mutex); 149 if (!ufile->fault_page) { 150 ufile->fault_page = alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0); 151 if (!ufile->fault_page) { 152 mutex_unlock(&ufile->umap_mutex); 153 return VM_FAULT_SIGBUS; 154 } 155 } 156 vmf->page = ufile->fault_page; 157 get_page(vmf->page); 158 mutex_unlock(&ufile->umap_mutex); 159 160 return 0; 161 } 162 163 static const struct vm_operations_struct g_urma_umap_ops = { 164 .open = uburma_umap_open, 165 .close = uburma_umap_close, 166 .fault = uburma_umap_fault, 167 }; 168 169 const struct vm_operations_struct *uburma_get_umap_ops(void)

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