export RK_PA3

hc

2024-02-19 151fecfb72a0d602dfe79790602ef64b4e241574

 kernel/mm/msync.c
..
..
@@ -57,7 +57,7 @@
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 	 * If the interval [start,end) covers some unmapped address ranges,
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 	 * just ignore them, but return -ENOMEM at the end.
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 	 */
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	vma = find_vma(mm, start);
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 	for (;;) {
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 		struct file *file;
..
..
@@ -88,12 +88,12 @@
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 		if ((flags & MS_SYNC) && file &&
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 				(vma->vm_flags & VM_SHARED)) {
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 			get_file(file);
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-			up_read(&mm->mmap_sem);
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+			mmap_read_unlock(mm);
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 			error = vfs_fsync_range(file, fstart, fend, 1);
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 			fput(file);
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 			if (error || start >= end)
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 				goto out;
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-			down_read(&mm->mmap_sem);
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+			mmap_read_lock(mm);
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 			vma = find_vma(mm, start);
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 		} else {
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 			if (start >= end) {
..
..
@@ -104,7 +104,7 @@
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 		}
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 	}
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 out_unlock:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 out:
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 	return error ? : unmapped_error;
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 }