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Message-Id: <161A0175-C77B-4252-9D1E-22FEC7EEADE9@oracle.com>
Date: Fri, 31 Jul 2020 08:30:52 -0400
From: Chuck Lever <chuck.lever@...cle.com>
To: Qinglang Miao <miaoqinglang@...wei.com>,
Bruce Fields <bfields@...ldses.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] nfsd: use DEFINE_SPINLOCK() for spinlock
Hello-
> On Jul 25, 2020, at 4:56 AM, Qinglang Miao <miaoqinglang@...wei.com> wrote:
>
> nfsd_drc_lock can be initialized automatically with
> DEFINE_SPINLOCK() rather than explicitly calling spin_lock_init().
>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
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
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