add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/misc/cxl/fault.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 2014 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/workqueue.h>
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@@ -168,7 +164,7 @@
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 		if (dsisr & CXL_PSL_DSISR_An_S)
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 			access |= _PAGE_WRITE;
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-		if (!mm && (REGION_ID(dar) != USER_REGION_ID))
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+		if (!mm && (get_region_id(dar) != USER_REGION_ID))
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 			access |= _PAGE_PRIVILEGED;
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 		if (dsisr & DSISR_NOHPTE)
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@@ -325,7 +321,7 @@
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 		return;
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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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 	for (vma = mm->mmap; vma; vma = vma->vm_next) {
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 		for (ea = vma->vm_start; ea < vma->vm_end;
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 				ea = next_segment(ea, slb.vsid)) {
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@@ -340,7 +336,7 @@
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 			last_esid = slb.esid;
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 		}
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 	}
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	mmput(mm);
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 }