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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/parisc/include/asm/futex.h
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@@ -16,7 +16,7 @@
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 _futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags)
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 {
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 	extern u32 lws_lock_start[];
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-	long index = ((long)uaddr & 0xf0) >> 2;
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+	long index = ((long)uaddr & 0x7f8) >> 1;
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 	arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
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 	local_irq_save(*flags);
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 	arch_spin_lock(s);
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@@ -26,7 +26,7 @@
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 _futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags)
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 {
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 	extern u32 lws_lock_start[];
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-	long index = ((long)uaddr & 0xf0) >> 2;
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+	long index = ((long)uaddr & 0x7f8) >> 1;
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 	arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
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 	arch_spin_unlock(s);
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 	local_irq_restore(*flags);
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@@ -40,7 +40,6 @@
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 	u32 tmp;
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 	_futex_spin_lock_irqsave(uaddr, &flags);
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-	pagefault_disable();
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 	ret = -EFAULT;
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 	if (unlikely(get_user(oldval, uaddr) != 0))
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@@ -73,7 +72,6 @@
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 		ret = -EFAULT;
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 out_pagefault_enable:
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-	pagefault_enable();
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 	_futex_spin_unlock_irqrestore(uaddr, &flags);
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 	if (!ret)
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@@ -95,7 +93,7 @@
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 	if (uaccess_kernel() && !uaddr)
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 		return -EFAULT;
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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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 	/* HPPA has no cmpxchg in hardware and therefore the