linux-kernel - [PATCH v6 02/11] dmapool: use sysfs

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Message-ID: <6c627beb-eb61-5baa-484a-e35567f05e89@cybernetics.com>
Date:   Tue, 7 Jun 2022 14:40:27 -0400
From:   Tony Battersby <tonyb@...ernetics.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     iommu@...ts.linux-foundation.org, kernel-team@...com,
        Matthew Wilcox <willy@...radead.org>,
        Keith Busch <kbusch@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Tony Lindgren <tony@...mide.com>
Subject: [PATCH v6 02/11] dmapool: use sysfs_emit() instead of scnprintf()

Use sysfs_emit instead of scnprintf, snprintf or sprintf.

Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
---

Changes since v5:
This patch was not in v5.

 mm/dmapool.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index 0f89de408cbe..1829291f5d70 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -64,18 +64,11 @@ static DEFINE_MUTEX(pools_reg_lock);
 
 static ssize_t pools_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
-	unsigned temp;
-	unsigned size;
-	char *next;
+	int size;
 	struct dma_page *page;
 	struct dma_pool *pool;
 
-	next = buf;
-	size = PAGE_SIZE;
-
-	temp = scnprintf(next, size, "poolinfo - 0.1\n");
-	size -= temp;
-	next += temp;
+	size = sysfs_emit(buf, "poolinfo - 0.1\n");
 
 	mutex_lock(&pools_lock);
 	list_for_each_entry(pool, &dev->dma_pools, pools) {
@@ -90,16 +83,14 @@ static ssize_t pools_show(struct device *dev, struct device_attribute *attr, cha
 		spin_unlock_irq(&pool->lock);
 
 		/* per-pool info, no real statistics yet */
-		temp = scnprintf(next, size, "%-16s %4u %4zu %4zu %2u\n",
-				 pool->name, blocks,
-				 pages * (pool->allocation / pool->size),
-				 pool->size, pages);
-		size -= temp;
-		next += temp;
+		size += sysfs_emit_at(buf, size, "%-16s %4u %4zu %4zu %2u\n",
+				      pool->name, blocks,
+				      pages * (pool->allocation / pool->size),
+				      pool->size, pages);
 	}
 	mutex_unlock(&pools_lock);
 
-	return PAGE_SIZE - size;
+	return size;
 }
 
 static DEVICE_ATTR_RO(pools);
-- 
2.25.1