linux-kernel - Re: [PATCH] bcachefs: Use snprintf() instead of scnprintf() when appropriate

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Date:   Tue, 19 Sep 2023 09:17:27 -0400
From:   Brian Foster <bfoster@...hat.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-bcachefs@...r.kernel.org
Subject: Re: [PATCH] bcachefs: Use snprintf() instead of scnprintf() when
 appropriate

On Sat, Sep 16, 2023 at 09:30:19AM +0200, Christophe JAILLET wrote:
> snprintf() and scnprintf() are the same, except for the returned value.
> When this value is not used, it is more logical to use snprintf() which is
> slightly simpler.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---

Seems reasonable:

Reviewed-by: Brian Foster <bfoster@...hat.com>

>  fs/bcachefs/super.c | 2 +-
>  fs/bcachefs/tests.c | 2 +-
>  fs/bcachefs/trace.h | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
> index 2990eed85adf..773ea93e44c1 100644
> --- a/fs/bcachefs/super.c
> +++ b/fs/bcachefs/super.c
> @@ -1180,7 +1180,7 @@ static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
>  {
>  	ca->dev_idx = dev_idx;
>  	__set_bit(ca->dev_idx, ca->self.d);
> -	scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
> +	snprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
>  
>  	ca->fs = c;
>  	rcu_assign_pointer(c->devs[ca->dev_idx], ca);
> diff --git a/fs/bcachefs/tests.c b/fs/bcachefs/tests.c
> index c907b3e00176..72f9bf186f9c 100644
> --- a/fs/bcachefs/tests.c
> +++ b/fs/bcachefs/tests.c
> @@ -926,7 +926,7 @@ int bch2_btree_perf_test(struct bch_fs *c, const char *testname,
>  
>  	time = j.finish - j.start;
>  
> -	scnprintf(name_buf, sizeof(name_buf), "%s:", testname);
> +	snprintf(name_buf, sizeof(name_buf), "%s:", testname);
>  	prt_human_readable_u64(&nr_buf, nr);
>  	prt_human_readable_u64(&per_sec_buf, div64_u64(nr * NSEC_PER_SEC, time));
>  	printk(KERN_INFO "%-12s %s with %u threads in %5llu sec, %5llu nsec per iter, %5s per sec\n",
> diff --git a/fs/bcachefs/trace.h b/fs/bcachefs/trace.h
> index 19264492151b..da303dd4b71c 100644
> --- a/fs/bcachefs/trace.h
> +++ b/fs/bcachefs/trace.h
> @@ -450,7 +450,7 @@ TRACE_EVENT(btree_path_relock_fail,
>  			c = six_lock_counts(&path->l[level].b->c.lock);
>  			__entry->read_count	= c.n[SIX_LOCK_read];
>  			__entry->intent_count	= c.n[SIX_LOCK_intent];
> -			scnprintf(__entry->node, sizeof(__entry->node), "%px", b);
> +			snprintf(__entry->node, sizeof(__entry->node), "%px", b);
>  		}
>  		__entry->iter_lock_seq		= path->l[level].lock_seq;
>  		__entry->node_lock_seq		= is_btree_node(path, level)
> -- 
> 2.34.1
>