Re: [PATCH v6 07/10] proc: flush task dcache entries from all procfs instances

[J Freyensee <why2jjj.linux@xxxxxxxxx>]

snip

.

.

.

>   
> +#ifdef CONFIG_PROC_FS
> +static inline void pidns_proc_lock(struct pid_namespace *pid_ns)
> +{
> +	down_write(&pid_ns->rw_proc_mounts);
> +}
> +
> +static inline void pidns_proc_unlock(struct pid_namespace *pid_ns)
> +{
> +	up_write(&pid_ns->rw_proc_mounts);
> +}
> +
> +static inline void pidns_proc_lock_shared(struct pid_namespace *pid_ns)
> +{
> +	down_read(&pid_ns->rw_proc_mounts);
> +}
> +
> +static inline void pidns_proc_unlock_shared(struct pid_namespace *pid_ns)
> +{
> +	up_read(&pid_ns->rw_proc_mounts);
> +}
> +#else /* !CONFIG_PROC_FS */
> +
Apologies for my newbie question. I couldn't help but notice all these 
function calls are assuming that the parameter struct pid_namespace 
*pid_ns will never be NULL.  Is that a good assumption?

I don't have the background in this code to answer on my own, but I 
thought I'd raise the question.

Thanks,
Jay