enable tun/tap/iptables

hc

2024-05-10 ee930fffee469d076998274a2ca55e13dc1efb67

 kernel/drivers/misc/cxl/cxllib.c
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@@ -1,10 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2017 IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #include <linux/hugetlb.h>
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@@ -211,7 +207,7 @@
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 	struct vm_area_struct *vma = NULL;
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 	int rc = 0;
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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, addr);
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 	if (!vma) {
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@@ -222,7 +218,7 @@
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 	*vma_start = vma->vm_start;
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 	*vma_end = vma->vm_end;
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 out:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return rc;
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 }
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..
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@@ -249,9 +245,8 @@
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 	     dar += page_size) {
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 		if (dar < vma_start || dar >= vma_end) {
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 			/*
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-			 * We don't hold the mm->mmap_sem semaphore
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-			 * while iterating, since the semaphore is
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-			 * required by one of the lower-level page
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+			 * We don't hold mm->mmap_lock while iterating, since
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+			 * the lock is required by one of the lower-level page
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 			 * fault processing functions and it could
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 			 * create a deadlock.
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 			 *