linux-kernel - Re: [PATCH] asm-generic: uaccess: fix up local access

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Date:	Sat, 13 Jun 2009 11:59:50 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] asm-generic: uaccess: fix up local access_ok() usage

On Sat, Jun 13, 2009 at 10:30, Mike Frysinger wrote:
> There's no reason that I can see to use the short __access_ok() form
> directly when the access_ok() is clearer in intent and for more people,
> expands to the same C code (i.e. always specify the first field -- access
> type).  Not all no-mmu systems lack memory protection, so the read/write
> could feasibly be checked.

hmm, and it also fixes the crazy amount of warnings you get otherwise
because the access_ok() expansion includes an unsigned long cast:
  CC [M]  fs/smbfs/request.o
In file included from
/usr/local/src/linux/linux-2.6/arch/blackfin/include/asm/uaccess.h:17,
                 from include/net/checksum.h:26,
                 from include/linux/skbuff.h:28,
                 from include/linux/ip.h:109,
                 from include/net/ip.h:27,
                 from fs/smbfs/smbiod.c:23:
include/asm-generic/uaccess.h: In function ‘copy_from_user’:
include/asm-generic/uaccess.h:247: warning: passing argument 1 of
‘_access_ok’ makes integer from pointer without a cast
include/asm-generic/uaccess.h: In function ‘copy_to_user’:
include/asm-generic/uaccess.h:257: warning: passing argument 1 of
‘_access_ok’ makes integer from pointer without a cast
include/asm-generic/uaccess.h: In function ‘strncpy_from_user’:
include/asm-generic/uaccess.h:281: warning: passing argument 1 of
‘_access_ok’ makes integer from pointer without a cast
include/asm-generic/uaccess.h: In function ‘clear_user’:
include/asm-generic/uaccess.h:319: warning: passing argument 1 of
‘_access_ok’ makes integer from pointer without a cast
-mike
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