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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/infiniband/hw/hfi1/user_pages.c
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@@ -91,9 +91,7 @@
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 	/* Convert to number of pages */
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 	size = DIV_ROUND_UP(size, PAGE_SIZE);
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-	down_read(&mm->mmap_sem);
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-	pinned = mm->pinned_vm;
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-	up_read(&mm->mmap_sem);
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+	pinned = atomic64_read(&mm->pinned_vm);
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 	/* First, check the absolute limit against all pinned pages. */
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 	if (pinned + npages >= ulimit && !can_lock)
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@@ -106,14 +104,13 @@
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 			    bool writable, struct page **pages)
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 {
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 	int ret;
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+	unsigned int gup_flags = FOLL_LONGTERM | (writable ? FOLL_WRITE : 0);
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-	ret = get_user_pages_fast(vaddr, npages, writable, pages);
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+	ret = pin_user_pages_fast(vaddr, npages, gup_flags, pages);
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 	if (ret < 0)
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 		return ret;
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-	down_write(&mm->mmap_sem);
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-	mm->pinned_vm += ret;
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-	up_write(&mm->mmap_sem);
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+	atomic64_add(ret, &mm->pinned_vm);
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 	return ret;
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 }
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@@ -121,17 +118,9 @@
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 void hfi1_release_user_pages(struct mm_struct *mm, struct page **p,
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 			     size_t npages, bool dirty)
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 {
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-	size_t i;
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-
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-	for (i = 0; i < npages; i++) {
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-		if (dirty)
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-			set_page_dirty_lock(p[i]);
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-		put_page(p[i]);
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-	}
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+	unpin_user_pages_dirty_lock(p, npages, dirty);
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 	if (mm) { /* during close after signal, mm can be NULL */
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-		down_write(&mm->mmap_sem);
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-		mm->pinned_vm -= npages;
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-		up_write(&mm->mmap_sem);
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+		atomic64_sub(npages, &mm->pinned_vm);
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 	}
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 }