Re: [PATCH -next] nfsd: use DEFINE_SPINLOCK() for spinlock

[Chuck Lever]

Hello-

> On Jul 25, 2020, at 4:56 AM, Qinglang Miao <miaoqinglang@xxxxxxxxxx> wrote:
> 
> nfsd_drc_lock can be initialized automatically with
> DEFINE_SPINLOCK() rather than explicitly calling spin_lock_init().
> 
> Signed-off-by: Qinglang Miao <miaoqinglang@xxxxxxxxxx>

Thanks for your patch.

I am quite honestly on the fence about this one. It doesn't
seem to make a difference behaviorally or in terms of code
legibility.

A broader clean-up that moves set_max_drc and those global
variables into nfs4state.c might be better, but again, there
isn't much to justify such a change.

Bruce, any thoughts?


> ---
> fs/nfsd/nfssvc.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> index b603dfcdd..20f0a27fe 100644
> --- a/fs/nfsd/nfssvc.c
> +++ b/fs/nfsd/nfssvc.c
> @@ -88,7 +88,7 @@ DEFINE_MUTEX(nfsd_mutex);
>  * version 4.1 DRC caches.
>  * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
>  */
> -spinlock_t	nfsd_drc_lock;
> +DEFINE_SPINLOCK(nfsd_drc_lock);
> unsigned long	nfsd_drc_max_mem;
> unsigned long	nfsd_drc_mem_used;
> 
> @@ -568,7 +568,6 @@ static void set_max_drc(void)
> 	nfsd_drc_max_mem = (nr_free_buffer_pages()
> 					>> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
> 	nfsd_drc_mem_used = 0;
> -	spin_lock_init(&nfsd_drc_lock);
> 	dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
> }
> 
> -- 
> 2.25.1
> 

--
Chuck Lever