linux-kernel - arch/s390/lib/uaccess

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Message-ID: <1365919574.1878.13.camel@joe-AO722>
Date:	Sat, 13 Apr 2013 23:06:14 -0700
From:	Joe Perches <joe@...ches.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: arch/s390/lib/uaccess_pt.c: Missing breaks: ?

Hello Heiko.

Commit ea81531d ("s390/uaccess: fix page table walk")
added this code.  It looks like it should have break;
for each case.

------------

static unsigned long follow_table(struct mm_struct *mm,
				  unsigned long address, int write)
{
	unsigned long *table = (unsigned long *)__pa(mm->pgd);

	switch (mm->context.asce_bits & _ASCE_TYPE_MASK) {
	case _ASCE_TYPE_REGION1:
		table = table + ((address >> 53) & 0x7ff);
		if (unlikely(*table & _REGION_ENTRY_INV))
			return -0x39UL;
		table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
	case _ASCE_TYPE_REGION2:
		table = table + ((address >> 42) & 0x7ff);
		if (unlikely(*table & _REGION_ENTRY_INV))
			return -0x3aUL;
		table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
	case _ASCE_TYPE_REGION3:
		table = table + ((address >> 31) & 0x7ff);
		if (unlikely(*table & _REGION_ENTRY_INV))
			return -0x3bUL;
		table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
	case _ASCE_TYPE_SEGMENT:
		table = table + ((address >> 20) & 0x7ff);
		if (unlikely(*table & _SEGMENT_ENTRY_INV))
			return -0x10UL;
		if (unlikely(*table & _SEGMENT_ENTRY_LARGE)) {
			if (write && (*table & _SEGMENT_ENTRY_RO))
				return -0x04UL;
			return (*table & _SEGMENT_ENTRY_ORIGIN_LARGE) +
				(address & ~_SEGMENT_ENTRY_ORIGIN_LARGE);
		}
		table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
	}


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