staging: lustre: osc: 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: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/osc/osc_page.c b/drivers/staging/lustre/lustre/osc/osc_page.c
index 537107c..d720b1a 100644 (file)
--- a/drivers/staging/lustre/lustre/osc/osc_page.c
+++ b/drivers/staging/lustre/lustre/osc/osc_page.c
@@ -563,6 +563,7 @@ int osc_lru_shrink(struct client_obd *cli, int target)
        struct cl_object *clobj = NULL;
        struct cl_page **pvec;
        struct osc_page *opg;
+       struct osc_page *temp;
        int maxscan = 0;
        int count = 0;
        int index = 0;
@@ -582,14 +583,12 @@ int osc_lru_shrink(struct client_obd *cli, int target)
        client_obd_list_lock(&cli->cl_lru_list_lock);
        atomic_inc(&cli->cl_lru_shrinkers);
        maxscan = min(target << 1, atomic_read(&cli->cl_lru_in_list));
-       while (!list_empty(&cli->cl_lru_list)) {
+       list_for_each_entry_safe(opg, temp, &cli->cl_lru_list, ops_lru) {
                struct cl_page *page;
 
                if (--maxscan < 0)
                        break;
 
-               opg = list_entry(cli->cl_lru_list.next, struct osc_page,
-                                ops_lru);
                page = cl_page_top(opg->ops_cl.cpl_page);
                if (cl_page_in_use_noref(page)) {
                        list_move_tail(&opg->ops_lru, &cli->cl_lru_list);