add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm/kernel/swp_emulate.c
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@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  linux/arch/arm/kernel/swp_emulate.c
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  *
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  *  Copyright (C) 2009 ARM Limited
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  *  __user_* functions adapted from include/asm/uaccess.h
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  *
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  *  Implements emulation of the SWP/SWPB instructions using load-exclusive and
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  *  store-exclusive for processors that have them disabled (or future ones that
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@@ -98,22 +95,20 @@
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  */
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 static void set_segfault(struct pt_regs *regs, unsigned long addr)
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 {
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-	siginfo_t info;
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+	int si_code;
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-	clear_siginfo(&info);
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-	down_read(&current->mm->mmap_sem);
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+	mmap_read_lock(current->mm);
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 	if (find_vma(current->mm, addr) == NULL)
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-		info.si_code = SEGV_MAPERR;
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+		si_code = SEGV_MAPERR;
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 	else
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-		info.si_code = SEGV_ACCERR;
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-	up_read(&current->mm->mmap_sem);
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-
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-	info.si_signo = SIGSEGV;
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-	info.si_errno = 0;
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-	info.si_addr  = (void *) instruction_pointer(regs);
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+		si_code = SEGV_ACCERR;
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+	mmap_read_unlock(current->mm);
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 	pr_debug("SWP{B} emulation: access caused memory abort!\n");
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-	arm_notify_die("Illegal memory access", regs, &info, 0, 0);
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+	arm_notify_die("Illegal memory access", regs,
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+		       SIGSEGV, si_code,
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+		       (void __user *)instruction_pointer(regs),
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+		       0, 0);
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 	abtcounter++;
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 }
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@@ -200,7 +195,7 @@
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 		 destreg, EXTRACT_REG_NUM(instr, RT2_OFFSET), data);
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 	/* Check access in reasonable access range for both SWP and SWPB */
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-	if (!access_ok(VERIFY_WRITE, (address & ~3), 4)) {
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+	if (!access_ok((void __user *)(address & ~3), 4)) {
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 		pr_debug("SWP{B} emulation: access to %p not allowed!\n",
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 			 (void *)address);
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 		res = -EFAULT;