On Thu, 2010-03-04 at 17:28 +0000, Will Deacon wrote:
> I took a quick look at the code in kernel/kgdb.c and adding the following
> memory barrier appears to resolve the issue:
>
> diff --git a/kernel/kgdb.c b/kernel/kgdb.c
> index 761fdd2..1308381 100644
> --- a/kernel/kgdb.c
> +++ b/kernel/kgdb.c
> @@ -1537,6 +1537,7 @@ acquirelock:
> * Wait till all the CPUs have quit
> * from the debugger.
> */
> + smp_wmb();
> for_each_online_cpu(i) {
> while (atomic_read(&cpu_in_kgdb[i]))
> cpu_relax();
Shouldn't this be smp_rmb()?
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