From: Rob Jones <rob.jones@codethink.co.uk>
Date: Thu, 9 Oct 2014 22:28:01 +0000 (-0700)
Subject: mm/vmalloc.c: use seq_open_private() instead of seq_open()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=703394c1005caeccaaf64945c1b6d6cc3af0cd1d;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

mm/vmalloc.c: use seq_open_private() instead of seq_open()

Using seq_open_private() removes boilerplate code from vmalloc_open().

The resultant code is shorter and easier to follow.

However, please note that seq_open_private() call kzalloc() rather than
kmalloc() which may affect timing due to the memory initialisation
overhead.

Signed-off-by: Rob Jones <rob.jones@codethink.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 2b0aa5486092..90520af7f186 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2646,21 +2646,11 @@ static const struct seq_operations vmalloc_op = {
 
 static int vmalloc_open(struct inode *inode, struct file *file)
 {
-	unsigned int *ptr = NULL;
-	int ret;
-
-	if (IS_ENABLED(CONFIG_NUMA)) {
-		ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
-		if (ptr == NULL)
-			return -ENOMEM;
-	}
-	ret = seq_open(file, &vmalloc_op);
-	if (!ret) {
-		struct seq_file *m = file->private_data;
-		m->private = ptr;
-	} else
-		kfree(ptr);
-	return ret;
+	if (IS_ENABLED(CONFIG_NUMA))
+		return seq_open_private(file, &vmalloc_op,
+					nr_node_ids * sizeof(unsigned int));
+	else
+		return seq_open(file, &vmalloc_op);
 }
 
 static const struct file_operations proc_vmalloc_operations = {