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Re: [PATCH] I/O helpers rework

To: rsandifo@redhat.com
Subject: Re: [PATCH] I/O helpers rework
From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Fri, 14 Jan 2005 10:52:27 +0900 (JST)
Cc: macro@mips.com, ralf@linux-mips.org, linux-mips@linux-mips.org, macro@linux-mips.org
In-reply-to: <87k6qh2e6j.fsf@redhat.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <874qhltcyv.fsf@redhat.com> <Pine.LNX.4.61.0501131824350.21179@perivale.mips.com> <87k6qh2e6j.fsf@redhat.com>
Sender: linux-mips-bounce@linux-mips.org
>>>>> On Thu, 13 Jan 2005 21:48:36 +0000, Richard Sandiford 
>>>>> <rsandifo@redhat.com> said:
rsandifo> You can't dereference it, obviously, just like you can't
rsandifo> deference a normal "void *".  But you can assign it to any
rsandifo> "volatile T *" without an explicit cast.  I assumed that's
rsandifo> what was happening in this case?

Assigning "void *" to "volatile T *" is not a problem.  Compiler warns
if you assigned "volatile T *" to "void *".

The warnings I mentioned before are:

/usr/src/linux/drivers/scsi/aic7xxx/aic7xxx_osm.h: In function `ahc_inb':
/usr/src/linux/drivers/scsi/aic7xxx/aic7xxx_osm.h:589: warning: passing arg 1 
of `readb' discards qualifiers from pointer target type

---
Atsushi Nemoto

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