From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>,
Kernel@smtp1.linux-foundation.org,
Zdenek@smtp1.linux-foundation.org,
development list <linux-kernel@vger.kernel.org>,
Kabelac <zdenek.kabelac@gmail.com>,
pm list <linux-pm@lists.linux-foundation.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
davem@davemloft.net, Pierre Ossman <drzeus-mmc@drzeus.cx>
Subject: Re: [patch] Re: using long instead of atomic_t when only set/read is required
Date: Mon, 3 Mar 2008 17:33:40 +0000 [thread overview]
Message-ID: <20080303173340.55a38c6b@core> (raw)
In-Reply-To: <200803040416.33937.nickpiggin@yahoo.com.au>
> Are you sure gcc doesn't? Or is it just "C"?
gcc doesn't
> Linux wouldn't work today if gcc did something non-atomic there
> (presuming you're talking about naturally aligned pointers/ints).
> It is widely used and accepted.
Yes and we've had tty layer traces in the past clearly showing it isn't
always safe, especially if any math is involved anywhere near the
assignment. That may be why pointer flipping happens to work.
Alan
next prev parent reply other threads:[~2008-03-03 17:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080225090316.GA420@elf.ucw.cz>
2008-02-25 14:46 ` using long instead of atomic_t when only set/read is required (was Re: [Bug 10030] Suspend doesn't work when SD card is inserted) Alan Stern
[not found] ` <Pine.LNX.4.44L0.0802250943410.3549-100000@iolanthe.rowland.org>
2008-03-03 12:08 ` [patch] Re: using long instead of atomic_t when only set/read is required Pavel Machek
[not found] ` <20080303120842.GA28369@elf.ucw.cz>
2008-03-03 15:42 ` Alan Stern
2008-03-03 15:48 ` Alan Cox
[not found] ` <Pine.LNX.4.44L0.0803031023550.3611-100000@iolanthe.rowland.org>
2008-03-03 15:53 ` Alan Cox
[not found] ` <20080303155330.39e45ad4@core>
2008-03-03 17:11 ` Alan Stern
2008-03-03 17:16 ` Nick Piggin
2008-03-03 17:31 ` Paul E. McKenney
2008-03-03 17:33 ` Alan Cox [this message]
2008-03-03 17:22 ` Paul E. McKenney
[not found] ` <20080303154831.22a4eb14@core>
2008-03-03 17:24 ` Pavel Machek
2008-03-03 20:27 ` Rafael J. Wysocki
[not found] ` <200803032127.30761.rjw@sisk.pl>
2008-03-03 21:12 ` Paul E. McKenney
2008-03-03 22:23 ` Linus Torvalds
[not found] <Pine.LNX.4.44L0.0803031207120.3611-100000@iolanthe.rowland.org>
2008-03-03 17:26 ` Linus Torvalds
2008-03-03 17:44 ` Pavel Machek
2008-03-06 15:58 ` Mark Lord
[not found] ` <47D014A6.9090300@rtr.ca>
2008-03-06 16:11 ` Linus Torvalds
[not found] ` <alpine.LFD.1.00.0803060807120.12253@woody.linux-foundation.org>
2008-03-06 16:27 ` Mark Lord
[not found] <20080303174422.GB13869@elf.ucw.cz>
2008-03-03 19:27 ` Alan Stern
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