linux-kernel - Re: [PATCH 4/4] asm-generic: uaccess: fix access

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Date:	Tue, 16 Jun 2009 06:34:34 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] asm-generic: uaccess: fix access_ok() prototype

On Sun, Jun 14, 2009 at 16:17, Arnd Bergmann wrote:
> On Sunday 14 June 2009, Mike Frysinger wrote:
>> @@ -37,14 +37,14 @@ static inline void set_fs(mm_segment_t fs)
>>  #define VERIFY_READ    0
>>  #define VERIFY_WRITE   1
>>
>> -#define access_ok(type, addr, size) __access_ok((unsigned long)(addr),(size))
>> +#define access_ok(type, addr, size) __access_ok((addr), (size))
>>
>>  /*
>>   * The architecture should really override this if possible, at least
>
> Upon actually testing this change, it turns out that this causes more
> trouble because of having to pass down pointers that may have 'const'
> or 'volatile' modifiers. I'm sure there is a way to do this correctly,
> but most architectures seem to cope well with 'unsigned long' here,
> and your patch 3/4 solves the original problem nicely.

yeah, i ended up making the Blackfin access_ok replacement cast the
first argument to an unsigned long to avoid those warnings ;).  i
guess we can just leave this alone for a rainy day ...
-mike
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