add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/openrisc/include/asm/futex.h
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@@ -35,7 +35,8 @@
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 {
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 	int oldval = 0, ret;
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-	pagefault_disable();
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+	if (!access_ok(uaddr, sizeof(u32)))
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+		return -EFAULT;
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 	switch (op) {
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 	case FUTEX_OP_SET:
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@@ -57,8 +58,6 @@
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 		ret = -ENOSYS;
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 	}
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-	pagefault_enable();
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-
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 	if (!ret)
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 		*oval = oldval;
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@@ -72,7 +71,7 @@
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 	int ret = 0;
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 	u32 prev;
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-	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
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+	if (!access_ok(uaddr, sizeof(u32)))
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 		return -EFAULT;
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 	__asm__ __volatile__ (				\