add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/openrisc/mm/fault.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * OpenRISC fault.c
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  *
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@@ -8,17 +9,13 @@
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  * Modifications for the OpenRISC architecture:
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  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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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/mm.h>
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 #include <linux/interrupt.h>
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 #include <linux/extable.h>
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 #include <linux/sched/signal.h>
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+#include <linux/perf_event.h>
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 #include <linux/uaccess.h>
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 #include <asm/siginfo.h>
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@@ -54,7 +51,7 @@
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 	struct vm_area_struct *vma;
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 	int si_code;
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 	vm_fault_t fault;
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-	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
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+	unsigned int flags = FAULT_FLAG_DEFAULT;
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 	tsk = current;
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..
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@@ -107,8 +104,10 @@
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 	if (in_interrupt() || !mm)
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 		goto no_context;
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+	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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+
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 retry:
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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, address);
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 	if (!vma)
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@@ -163,9 +162,9 @@
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 	 * the fault.
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 	 */
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-	fault = handle_mm_fault(vma, address, flags);
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+	fault = handle_mm_fault(vma, address, flags, regs);
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-	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
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+	if (fault_signal_pending(fault, regs))
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 		return;
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 	if (unlikely(fault & VM_FAULT_ERROR)) {
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@@ -180,15 +179,10 @@
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 	if (flags & FAULT_FLAG_ALLOW_RETRY) {
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 		/*RGD modeled on Cris */
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-		if (fault & VM_FAULT_MAJOR)
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-			tsk->maj_flt++;
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-		else
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-			tsk->min_flt++;
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 		if (fault & VM_FAULT_RETRY) {
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-			flags &= ~FAULT_FLAG_ALLOW_RETRY;
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 			flags |= FAULT_FLAG_TRIED;
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-			 /* No need to up_read(&mm->mmap_sem) as we would
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+			 /* No need to mmap_read_unlock(mm) as we would
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 			 * have already released it in __lock_page_or_retry
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 			 * in mm/filemap.c.
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 			 */
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@@ -197,7 +191,7 @@
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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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 	return;
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 	/*
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@@ -206,14 +200,14 @@
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 	 */
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 bad_area:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 bad_area_nosemaphore:
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 	/* User mode accesses just cause a SIGSEGV */
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 	if (user_mode(regs)) {
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-		force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
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+		force_sig_fault(SIGSEGV, si_code, (void __user *)address);
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 		return;
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 	}
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@@ -265,20 +259,20 @@
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 	__asm__ __volatile__("l.nop 42");
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 	__asm__ __volatile__("l.nop 1");
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	if (!user_mode(regs))
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 		goto no_context;
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 	pagefault_out_of_memory();
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 	return;
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 do_sigbus:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	/*
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 	 * Send a sigbus, regardless of whether we were in kernel
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 	 * or user mode.
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 	 */
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-	force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
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+	force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
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 	/* Kernel mode? Handle exceptions or die */
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 	if (!user_mode(regs))
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@@ -300,6 +294,7 @@
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 		int offset = pgd_index(address);
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 		pgd_t *pgd, *pgd_k;
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+		p4d_t *p4d, *p4d_k;
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 		pud_t *pud, *pud_k;
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 		pmd_t *pmd, *pmd_k;
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 		pte_t *pte_k;
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@@ -326,8 +321,13 @@
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 		 * it exists.
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 		 */
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-		pud = pud_offset(pgd, address);
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-		pud_k = pud_offset(pgd_k, address);
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+		p4d = p4d_offset(pgd, address);
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+		p4d_k = p4d_offset(pgd_k, address);
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+		if (!p4d_present(*p4d_k))
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+			goto no_context;
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+
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+		pud = pud_offset(p4d, address);
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+		pud_k = pud_offset(p4d_k, address);
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 		if (!pud_present(*pud_k))
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 			goto no_context;
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