On Wed, 6 Dec 2006, Matthew Wilcox wrote:
> It's just been pointed out to me that the parisc one isn't safe.
>
> <dhowells> imagine variable X is set to 3
> <dhowells> CPU A issues cmpxchg(&X, 3, 5)
> <dhowells> you'd expect that to change X to 5
> <dhowells> but what if CPU B assigns 6 to X between cmpxchg reading X
> and it setting X?
The same could happen with a regular cmpxchg. Cmpxchg changes it to 5 and
then other cpu performs a store before the next instruction.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
