linux-kernel - Re: arch/s390/lib/uaccess

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Date:	Mon, 15 Apr 2013 07:48:14 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: arch/s390/lib/uaccess_pt.c: Missing breaks: ?

On Sat, Apr 13, 2013 at 11:06:14PM -0700, Joe Perches wrote:
> Hello Heiko.
> 
> Commit ea81531d ("s390/uaccess: fix page table walk")
> added this code.  It looks like it should have break;
> for each case.

Hi Joe,

no, the fallthrough is on purpose for each case statement.

> 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:

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