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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nds32/mm/alignment.c
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@@ -289,13 +289,13 @@
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 		unaligned_addr += shift;
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 	if (load) {
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-		if (!access_ok(VERIFY_READ, (void *)unaligned_addr, len))
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+		if (!access_ok((void *)unaligned_addr, len))
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 			return -EACCES;
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 		get_data(unaligned_addr, &target_val, len);
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 		*idx_to_addr(regs, target_idx) = target_val;
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 	} else {
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-		if (!access_ok(VERIFY_WRITE, (void *)unaligned_addr, len))
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+		if (!access_ok((void *)unaligned_addr, len))
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 			return -EACCES;
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 		target_val = *idx_to_addr(regs, target_idx);
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 		set_data((void *)unaligned_addr, target_val, len);
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@@ -479,7 +479,7 @@
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 	if (load) {
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-		if (!access_ok(VERIFY_READ, (void *)unaligned_addr, len))
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+		if (!access_ok((void *)unaligned_addr, len))
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 			return -EACCES;
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 		get_data(unaligned_addr, &target_val, len);
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@@ -491,7 +491,7 @@
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 			*idx_to_addr(regs, RT(inst)) = target_val;
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 	} else {
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-		if (!access_ok(VERIFY_WRITE, (void *)unaligned_addr, len))
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+		if (!access_ok((void *)unaligned_addr, len))
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 			return -EACCES;
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 		target_val = *idx_to_addr(regs, RT(inst));
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@@ -512,7 +512,7 @@
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 {
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 	unsigned long inst;
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 	int ret = -EFAULT;
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-	mm_segment_t seg = get_fs();
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+	mm_segment_t seg;
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 	inst = get_inst(regs->ipc);
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..
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@@ -520,13 +520,12 @@
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 	      "Faulting addr: 0x%08lx, pc: 0x%08lx [inst: 0x%08lx ]\n", addr,
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 	      regs->ipc, inst);
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-	set_fs(USER_DS);
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-
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+	seg = force_uaccess_begin();
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 	if (inst & NDS32_16BIT_INSTRUCTION)
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 		ret = do_16((inst >> 16) & 0xffff, regs);
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 	else
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 		ret = do_32(inst, regs);
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-	set_fs(seg);
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+	force_uaccess_end(seg);
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 	return ret;
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 }