[PATCH v1 14/16] mm: rename zap_page_range_single() to zap_vma_range()

@@ -89,7 +89,7 @@ void gmap_helper_discard(struct mm_struct *mm, unsigned long vmaddr, unsigned lo
 		if (!vma)
 			return;
 		if (!is_vm_hugetlb_page(vma))
-			zap_page_range_single(vma, vmaddr, min(end, vma->vm_end) - vmaddr);
+			zap_vma_range(vma, vmaddr, min(end, vma->vm_end) - vmaddr);
 		vmaddr = vma->vm_end;
 	}
 }

@@ -130,7 +130,7 @@ pub(crate) struct ShrinkablePageRange {
     pid: Pid,
     /// The mm for the relevant process.
     mm: ARef<Mm>,
-    /// Used to synchronize calls to `vm_insert_page` and `zap_page_range_single`.
+    /// Used to synchronize calls to `vm_insert_page` and `zap_vma_range`.
     #[pin]
     mm_lock: Mutex<()>,
     /// Spinlock protecting changes to pages.

@@ -719,7 +719,7 @@ fn drop(self: Pin<&mut Self>) {
 
     if let Some(vma) = mmap_read.vma_lookup(vma_addr) {
         let user_page_addr = vma_addr + (page_index << PAGE_SHIFT);
-        vma.zap_page_range_single(user_page_addr, PAGE_SIZE);
+        vma.zap_vma_range(user_page_addr, PAGE_SIZE);
     }
 
     drop(mmap_read);

@@ -1185,7 +1185,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
 	if (vma) {
 		trace_binder_unmap_user_start(alloc, index);
 
-		zap_page_range_single(vma, page_addr, PAGE_SIZE);
+		zap_vma_range(vma, page_addr, PAGE_SIZE);
 
 		trace_binder_unmap_user_end(alloc, index);
 	}

@@ -2835,7 +2835,7 @@ struct page *vm_normal_page_pud(struct vm_area_struct *vma, unsigned long addr,
 
 void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
 		  unsigned long size);
-void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
+void zap_vma_range(struct vm_area_struct *vma, unsigned long address,
 			   unsigned long size);
 /**
  * zap_vma - zap all page table entries in a vma

@@ -2843,7 +2843,7 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
  */
 static inline void zap_vma(struct vm_area_struct *vma)
 {
-	zap_page_range_single(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+	zap_vma_range(vma, vma->vm_start, vma->vm_end - vma->vm_start);
 }
 struct mmu_notifier_range;
 

@@ -656,7 +656,7 @@ static void zap_pages(struct bpf_arena *arena, long uaddr, long page_cnt)
 	guard(mutex)(&arena->lock);
 	/* iterate link list under lock */
 	list_for_each_entry(vml, &arena->vma_list, head)
-		zap_page_range_single(vml->vma, uaddr, PAGE_SIZE * page_cnt);
+		zap_vma_range(vml->vma, uaddr, PAGE_SIZE * page_cnt);
 }
 
 static void arena_free_pages(struct bpf_arena *arena, long uaddr, long page_cnt, bool sleepable)

@@ -7215,7 +7215,7 @@ static int map_range(struct perf_buffer *rb, struct vm_area_struct *vma)
 #ifdef CONFIG_MMU
 	/* Clear any partial mappings on error. */
 	if (err)
-		zap_page_range_single(vma, vma->vm_start, nr_pages * PAGE_SIZE);
+		zap_vma_range(vma, vma->vm_start, nr_pages * PAGE_SIZE);
 #endif
 
 	return err;

@@ -832,7 +832,7 @@ static int madvise_free_single_vma(struct madvise_behavior *madv_behavior)
  * Application no longer needs these pages.  If the pages are dirty,
  * it's OK to just throw them away.  The app will be more careful about
  * data it wants to keep.  Be sure to free swap resources too.  The
- * zap_page_range_single call sets things up for shrink_active_list to actually
+ * zap_vma_range call sets things up for shrink_active_list to actually
  * free these pages later if no one else has touched them in the meantime,
  * although we could add these pages to a global reuse list for
  * shrink_active_list to pick up before reclaiming other pages.

@@ -1191,7 +1191,7 @@ static long madvise_guard_install(struct madvise_behavior *madv_behavior)
 		 * OK some of the range have non-guard pages mapped, zap
 		 * them. This leaves existing guard pages in place.
 		 */
-		zap_page_range_single(vma, range->start, range->end - range->start);
+		zap_vma_range(vma, range->start, range->end - range->start);
 	}
 
 	/*

@@ -2215,14 +2215,14 @@ void zap_vma_range_batched(struct mmu_gather *tlb,
 }
 
 /**
- * zap_page_range_single - remove user pages in a given range
- * @vma: vm_area_struct holding the applicable pages
- * @address: starting address of pages to zap
+ * zap_vma_range - zap all page table entries in a vma range
+ * @vma: the vma covering the range to zap
+ * @address: starting address of the range to zap
  * @size: number of bytes to zap
  *
- * The range must fit into one VMA.
+ * The provided address range must be fully contained within @vma.
  */
-void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
+void zap_vma_range(struct vm_area_struct *vma, unsigned long address,
 		unsigned long size)
 {
 	struct mmu_gather tlb;

@@ -2250,7 +2250,7 @@ void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
 	    		!(vma->vm_flags & VM_PFNMAP))
 		return;
 
-	zap_page_range_single(vma, address, size);
+	zap_vma_range(vma, address, size);
 }
 EXPORT_SYMBOL_GPL(zap_vma_ptes);
 

@@ -3018,7 +3018,7 @@ static int remap_pfn_range_notrack(struct vm_area_struct *vma, unsigned long add
 	 * maintain page reference counts, and callers may free
 	 * pages due to the error. So zap it early.
 	 */
-	zap_page_range_single(vma, addr, size);
+	zap_vma_range(vma, addr, size);
 	return error;
 }
 

@@ -2104,7 +2104,7 @@ static int tcp_zerocopy_vm_insert_batch_error(struct vm_area_struct *vma,
 		maybe_zap_len = total_bytes_to_map -  /* All bytes to map */
 				*length + /* Mapped or pending */
 				(pages_remaining * PAGE_SIZE); /* Failed map. */
-		zap_page_range_single(vma, *address, maybe_zap_len);
+		zap_vma_range(vma, *address, maybe_zap_len);
 		err = 0;
 	}
 

@@ -2112,7 +2112,7 @@ static int tcp_zerocopy_vm_insert_batch_error(struct vm_area_struct *vma,
 		unsigned long leftover_pages = pages_remaining;
 		int bytes_mapped;
 
-		/* We called zap_page_range_single, try to reinsert. */
+		/* We called zap_vma_range, try to reinsert. */
 		err = vm_insert_pages(vma, *address,
 				      pending_pages,
 				      &pages_remaining);

@@ -2269,7 +2269,7 @@ static int tcp_zerocopy_receive(struct sock *sk,
 	total_bytes_to_map = avail_len & ~(PAGE_SIZE - 1);
 	if (total_bytes_to_map) {
 		if (!(zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT))
-			zap_page_range_single(vma, address, total_bytes_to_map);
+			zap_vma_range(vma, address, total_bytes_to_map);
 		zc->length = total_bytes_to_map;
 		zc->recv_skip_hint = 0;
 	} else {

@@ -113,7 +113,7 @@ pub fn end(&self) -> usize {
     /// kernel goes further in freeing unused page tables, but for the purposes of this operation
     /// we must only assume that the leaf level is cleared.
     #[inline]
-    pub fn zap_page_range_single(&self, address: usize, size: usize) {
+    pub fn zap_vma_range(&self, address: usize, size: usize) {
         let (end, did_overflow) = address.overflowing_add(size);
         if did_overflow || address < self.start() || self.end() < end {
             // TODO: call WARN_ONCE once Rust version of it is added

@@ -124,7 +124,7 @@ pub fn zap_page_range_single(&self, address: usize, size: usize) {
         // sufficient for this method call. This method has no requirements on the vma flags. The
         // address range is checked to be within the vma.
         unsafe {
-            bindings::zap_page_range_single(self.as_ptr(), address, size)
+            bindings::zap_vma_range(self.as_ptr(), address, size)
         };
     }