Re: [PATCH 2/2] build: convert NR_CPUS to Kconfig

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 08/01/16 23:17, Doug Goldstein wrote:
> diff --git a/xen/common/spinlock.c b/xen/common/spinlock.c
> index 7f89694..9207179 100644
> --- a/xen/common/spinlock.c
> +++ b/xen/common/spinlock.c
> @@ -246,7 +246,7 @@ int _spin_trylock_recursive(spinlock_t *lock)
>      unsigned int cpu = smp_processor_id();
>  
>      /* Don't allow overflow of recurse_cpu field. */
> -    BUILD_BUG_ON(NR_CPUS > 0xfffu);
> +    BUILD_BUG_ON(CONFIG_NR_CPUS > 0xfffu);
>  
>      check_lock(&lock->debug);
>  

Talking of recursive spinlocks, this check has a fencepost error.

I have submitted a cleanup patch, subject "xen/spinlock: Use mnemonics
for recursive spinlock sentinel values", which also fixes this bug.

It is going to conflict with this change.  I don't mind rebasing,
depending on which patch gets accepted first.

Everything else looks fine.  Reviewed-by: Andrew Cooper
<andrew.cooper3@citrix.com>