[JFFS2] Remove number of pointer dereferences in fs/jffs2/summary.c

Reduce the nr.  of pointer dereferences in fs/jffs2/summary.c

Benefits:
 - micro speed optimization due to fewer pointer derefs
 - generated code is slightly smaller
 - better readability

(The first two sound like a compiler problem but I'll go with the third. dwmw2).

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/fs/jffs2/summary.c b/fs/jffs2/summary.c
index 3240d62..7b0ed77 100644 (file)
--- a/fs/jffs2/summary.c
+++ b/fs/jffs2/summary.c
@@ -581,16 +581,17 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
        wpage = c->summary->sum_buf;
 
        while (c->summary->sum_num) {
+               temp = c->summary->sum_list_head;
 
-               switch (je16_to_cpu(c->summary->sum_list_head->u.nodetype)) {
+               switch (je16_to_cpu(temp->u.nodetype)) {
                        case JFFS2_NODETYPE_INODE: {
                                struct jffs2_sum_inode_flash *sino_ptr = wpage;
 
-                               sino_ptr->nodetype = c->summary->sum_list_head->i.nodetype;
-                               sino_ptr->inode = c->summary->sum_list_head->i.inode;
-                               sino_ptr->version = c->summary->sum_list_head->i.version;
-                               sino_ptr->offset = c->summary->sum_list_head->i.offset;
-                               sino_ptr->totlen = c->summary->sum_list_head->i.totlen;
+                               sino_ptr->nodetype = temp->i.nodetype;
+                               sino_ptr->inode = temp->i.inode;
+                               sino_ptr->version = temp->i.version;
+                               sino_ptr->offset = temp->i.offset;
+                               sino_ptr->totlen = temp->i.totlen;
 
                                wpage += JFFS2_SUMMARY_INODE_SIZE;
 
@@ -600,19 +601,19 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
                        case JFFS2_NODETYPE_DIRENT: {
                                struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 
-                               sdrnt_ptr->nodetype = c->summary->sum_list_head->d.nodetype;
-                               sdrnt_ptr->totlen = c->summary->sum_list_head->d.totlen;
-                               sdrnt_ptr->offset = c->summary->sum_list_head->d.offset;
-                               sdrnt_ptr->pino = c->summary->sum_list_head->d.pino;
-                               sdrnt_ptr->version = c->summary->sum_list_head->d.version;
-                               sdrnt_ptr->ino = c->summary->sum_list_head->d.ino;
-                               sdrnt_ptr->nsize = c->summary->sum_list_head->d.nsize;
-                               sdrnt_ptr->type = c->summary->sum_list_head->d.type;
+                               sdrnt_ptr->nodetype = temp->d.nodetype;
+                               sdrnt_ptr->totlen = temp->d.totlen;
+                               sdrnt_ptr->offset = temp->d.offset;
+                               sdrnt_ptr->pino = temp->d.pino;
+                               sdrnt_ptr->version = temp->d.version;
+                               sdrnt_ptr->ino = temp->d.ino;
+                               sdrnt_ptr->nsize = temp->d.nsize;
+                               sdrnt_ptr->type = temp->d.type;
 
-                               memcpy(sdrnt_ptr->name, c->summary->sum_list_head->d.name,
-                                                       c->summary->sum_list_head->d.nsize);
+                               memcpy(sdrnt_ptr->name, temp->d.name,
+                                                       temp->d.nsize);
 
-                               wpage += JFFS2_SUMMARY_DIRENT_SIZE(c->summary->sum_list_head->d.nsize);
+                               wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 
                                break;
                        }
@@ -622,8 +623,7 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
                        }
                }
 
-               temp = c->summary->sum_list_head;
-               c->summary->sum_list_head = c->summary->sum_list_head->u.next;
+               c->summary->sum_list_head = temp->u.next;
                kfree(temp);
 
                c->summary->sum_num--;