Messages in this thread |  | | Date | Sat, 09 Dec 2000 16:07:03 +0100 | From | Roberto Fichera <> | Subject | Re: [PATCH] mm->rss is modified without page_table_lock held |
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At 06.42 09/12/00 -0800, David S. Miller wrote:
> 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.
8 bits for a spinlock ? What kind of use we have here ? All arch except Sparc32 don't have this trick.
Roberto Fichera.
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