diff options
Diffstat (limited to 'arch/arm/kernel/swp_emulate.c')
| -rw-r--r-- | arch/arm/kernel/swp_emulate.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c index 76f6e6a9736c..fdce83c95acb 100644 --- a/arch/arm/kernel/swp_emulate.c +++ b/arch/arm/kernel/swp_emulate.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/kernel/swp_emulate.c * * Copyright (C) 2009 ARM Limited * __user_* functions adapted from include/asm/uaccess.h * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * Implements emulation of the SWP/SWPB instructions using load-exclusive and * store-exclusive for processors that have them disabled (or future ones that * might not implement them). @@ -37,6 +34,7 @@ */ #define __user_swpX_asm(data, addr, res, temp, B) \ __asm__ __volatile__( \ + ".arch armv7-a\n" \ "0: ldrex"B" %2, [%3]\n" \ "1: strex"B" %0, %1, [%3]\n" \ " cmp %0, #0\n" \ @@ -100,12 +98,12 @@ static void set_segfault(struct pt_regs *regs, unsigned long addr) { int si_code; - down_read(¤t->mm->mmap_sem); + mmap_read_lock(current->mm); if (find_vma(current->mm, addr) == NULL) si_code = SEGV_MAPERR; else si_code = SEGV_ACCERR; - up_read(¤t->mm->mmap_sem); + mmap_read_unlock(current->mm); pr_debug("SWP{B} emulation: access caused memory abort!\n"); arm_notify_die("Illegal memory access", regs, @@ -198,7 +196,7 @@ static int swp_handler(struct pt_regs *regs, unsigned int instr) destreg, EXTRACT_REG_NUM(instr, RT2_OFFSET), data); /* Check access in reasonable access range for both SWP and SWPB */ - if (!access_ok((address & ~3), 4)) { + if (!access_ok((void __user *)(address & ~3), 4)) { pr_debug("SWP{B} emulation: access to %p not allowed!\n", (void *)address); res = -EFAULT; |