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Date: Sat, 9 Dec 2000 06:42:38 -0800
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From: "David S. Miller" <davem@redhat.com>
To: kernel@tekno-soft.it
CC: rasmus@jaquet.dk, torvalds@transmeta.com, linux-kernel@vger.kernel.org
In-Reply-To: <4.3.2.7.2.20001209152806.00c8e7b0@mail.tekno-soft.it> (message
	from Roberto Fichera on Sat, 09 Dec 2000 15:48:05 +0100)
Subject: Re: [PATCH] mm->rss is modified without page_table_lock held
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 <4.3.2.7.2.20001209111347.00c829f0@mail.tekno-soft.it> <4.3.2.7.2.20001209152806.00c8e7b0@mail.tekno-soft.it>
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   Date: Sat, 09 Dec 2000 15:48:05 +0100
   From: Roberto Fichera <kernel@tekno-soft.it>

   >atomic_t does not guarentee a large enough range necessary for mm->rss

   If we haven't some atomic_t that can be negative we could define atomic_t 
   as unsigned long for all arch,
   this is sufficient to fitting all the range for the mm->rss.

32-bit Sparc has unsigned long as 32-bit, and the top 8 bits of the
atomic_t are used for a spinlock, thus a 27-bit atomic_t, there
is not enough precision.

Later,
David S. Miller
davem@redhat.com
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