Re: [patch] generic-pidhash-2.5.36-D4, BK-curr

From: Ingo Molnar (
Date: Fri Sep 20 2002 - 04:40:16 EST

On Fri, 20 Sep 2002, Oleg Drokin wrote:

> > + if (cmpxchg(&map->page, NULL, page))
> > + free_page(page);
> Note that this piece breaks compilation for every arch that does not
> have cmpxchg implementation.
> This is the case with x86 (with CONFIG_X86_CMPXCHG undefined, e.g. i386),
> ARM, CRIS, m68k, MIPS, MIPS64, PARISC, s390, SH, sparc32, UML (for x86).

we need a cmpxchg() function in the generic library, using a spinlock.
Then every architecture can enhance the implementation if it wishes to.


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