linux-kernel - [PATCH 4/5] staging: lustre: llite: Use list_for_each_entry

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Date:   Sun,  5 Mar 2017 22:36:49 +0530
From:   simran singhal <singhalsimran0@...il.com>
To:     oleg.drokin@...el.com
Cc:     andreas.dilger@...el.com, jsimmons@...radead.org,
        gregkh@...uxfoundation.org, lustre-devel@...ts.lustre.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: [PATCH 4/5] staging: lustre: llite: Use list_for_each_entry_safe

Doubly linked lists which are  iterated  using list_empty
and list_entry macros have been replaced with list_for_each_entry_safe
macro.
This makes the iteration simpler and more readable.

This patch replaces the while loop containing list_empty and list_entry
with list_for_each_entry_safe.

This was done with Coccinelle.

@@
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry_safe;
@@

T *I1;
+ T *tmp;
...
- while (list_empty(&E1) == 0)
+ list_for_each_entry_safe (I1, tmp, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...
}

Signed-off-by: simran singhal <singhalsimran0@...il.com>
---
 drivers/staging/lustre/lustre/llite/statahead.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
index fb7c315..d1287b2 100644
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -860,6 +860,7 @@ static int ll_agl_thread(void *arg)
 	struct inode	     *dir    = d_inode(parent);
 	struct ll_inode_info     *plli   = ll_i2info(dir);
 	struct ll_inode_info     *clli;
+	struct ll_inode_info *tmp;
 	struct ll_sb_info	*sbi    = ll_i2sbi(dir);
 	struct ll_statahead_info *sai;
 	struct ptlrpc_thread *thread;
@@ -909,9 +910,7 @@ static int ll_agl_thread(void *arg)
 
 	spin_lock(&plli->lli_agl_lock);
 	sai->sai_agl_valid = 0;
-	while (!list_empty(&sai->sai_agls)) {
-		clli = list_entry(sai->sai_agls.next,
-				  struct ll_inode_info, lli_agl_list);
+	list_for_each_entry_safe(clli, tmp, &sai->sai_agls, lli_agl_list) {
 		list_del_init(&clli->lli_agl_list);
 		spin_unlock(&plli->lli_agl_lock);
 		clli->lli_agl_index = 0;
-- 
2.7.4