From: Oleg Drokin <green@namesys.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
William Lee Irwin III <wli@holomorphy.com>,
linux-kernel@vger.kernel.org
Subject: Re: [patch] generic-pidhash-2.5.36-D4, BK-curr
Date: Fri, 20 Sep 2002 15:43:47 +0400 [thread overview]
Message-ID: <20020920154347.A12399@namesys.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0209201139290.1261-100000@localhost.localdomain>
Hello!
On Fri, Sep 20, 2002 at 11:40:16AM +0200, Ingo Molnar 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.
But this is not safe for arches that provides SMP but does not provide
cmpxchg in hadware, right?
I mean it is only safe to use such spinlock-based function if
all other places read and write this value via special functions that are
also taking this spinlock.
Do you think we can count on this?
Bye,
Oleg
next prev parent reply other threads:[~2002-09-20 11:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44.0209182101150.27697-100000@localhost.localdomain>
2002-09-19 2:54 ` [patch] generic-pidhash-2.5.36-D4, BK-curr Ingo Molnar
2002-09-19 6:10 ` Linus Torvalds
2002-09-19 9:25 ` Ingo Molnar
2002-09-19 10:59 ` William Lee Irwin III
2002-09-19 15:12 ` Linus Torvalds
2002-09-19 15:21 ` Ingo Molnar
2002-09-19 16:35 ` Andries Brouwer
2002-09-19 16:43 ` Linus Torvalds
2002-09-19 18:54 ` Miquel van Smoorenburg
2002-09-19 19:10 ` Kai Henningsen
2002-09-19 20:32 ` Linus Torvalds
2002-09-19 22:29 ` Miquel van Smoorenburg
2002-09-19 19:38 ` [patch] generic-pidhash-2.5.36-J2, BK-curr Ingo Molnar
2002-09-19 20:21 ` Christoph Hellwig
2002-09-19 23:32 ` Dave Jones
2002-09-19 23:46 ` Ingo Molnar
2002-09-19 21:31 ` Linus Torvalds
2002-09-19 21:39 ` Ingo Molnar
2002-09-20 8:27 ` [patch] generic-pidhash-2.5.36-D4, BK-curr Oleg Drokin
2002-09-20 9:40 ` Ingo Molnar
2002-09-20 11:43 ` Oleg Drokin [this message]
2002-09-20 12:15 ` Russell King
2002-09-20 16:34 ` Ingo Molnar
2002-09-20 17:11 ` Andrew Morton
2002-09-20 13:03 Hanumanthu. H
-- strict thread matches above, loose matches on Subject: below --
2002-09-20 13:12 Hanumanthu. H
2002-09-20 13:09 ` Oleg Drokin
2002-09-20 16:47 ` Ingo Molnar
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