linux-kernel - Re: [osd-dev] [PATCH 6/8] exofs: super_operations and file_system

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Date:	Wed, 01 Apr 2009 11:05:21 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Benny Halevy <bhalevy@...asas.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jeff Garzik <jeff@...zik.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Avishay Traeger <avishay@...il.com>,
	open-osd <osd-dev@...n-osd.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Evgeniy Polyakov <zbr@...emap.net>
Subject: Re: [osd-dev] [PATCH 6/8] exofs: super_operations and	file_system_type

On 03/31/2009 09:52 PM, Benny Halevy wrote:
> On Mar. 31, 2009, 11:04 +0300, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> ~0 is signed 0xffffffff.
>>
>> When assigning to a u64 it gets signed extended to signed
>> 0xffffffffffffffff and then converted to unsigned 0xffffffffffffffff.
> 
> Right (I think, I'm not sure in what order)
> 
>> I think.  Just as with plain old "-1".  Perhaps using plain old "-1"
>> would be clearer here.
> 
> or maybe ~0ULL or ~(uint64_t)0 to be extremely anal about it.
> 
> Benny
> 

There is only one right way => ULLONG_MAX. Takes care of the human factor
too. (BTW that one is defined (~0ULL))

Thanks
Boaz

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