Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 25 Feb 2003 14:31:48 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: atomic_t (24 bits???) |
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On Tue, 25 Feb 2003, Daniel Jacobowitz wrote:
> On Tue, Feb 25, 2003 at 02:11:11PM -0500, Richard B. Johnson wrote: > > > > In ../linux/include/asm/atomic.h, for versions 2.4.18 and > > above as far as I've checked, there are repeated warnings > > "Note that the guaranteed useful range of an atomic_t is > > only 24 bits." > > > > I fail to see any reason why as atomic_t is typdefed to a > > volatile int which, on ix86 seems to be 32 bits. > > > > Does anybody know if this is just some old comments from a > > previous atomic_t type of, perhaps, char[3]? > > There are other platforms where you can't reliably use the whole word. > Some ARM atomic_t implementations are like this, although I don't know > if the one in the kernel is. > > -- > Daniel Jacobowitz > MontaVista Software Debian GNU/Linux Developer > Okay. Thanks.
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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