sparse pointer use of zero as null

Get rid of sparse related warnings from places that use integer as NULL
pointer.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 11 insertions, 10 deletions

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 65c290470664..5d9fec0b7ebd 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -217,7 +217,7 @@ static int journal_start_thread(journal_t *journal)
         if (IS_ERR(t))
                 return PTR_ERR(t);
 
-        wait_event(journal->j_wait_done_commit, journal->j_task != 0);
+        wait_event(journal->j_wait_done_commit, journal->j_task != NULL);
         return 0;
 }
 
@@ -229,7 +229,8 @@ static void journal_kill_thread(journal_t *journal)
         while (journal->j_task) {
                 wake_up(&journal->j_wait_commit);
                 spin_unlock(&journal->j_state_lock);
-                wait_event(journal->j_wait_done_commit, journal->j_task == 0);
+                wait_event(journal->j_wait_done_commit,
+                                journal->j_task == NULL);
                 spin_lock(&journal->j_state_lock);
         }
         spin_unlock(&journal->j_state_lock);
@@ -1651,14 +1652,14 @@ static struct journal_head *journal_alloc_journal_head(void)
         atomic_inc(&nr_journal_heads);
 #endif
         ret = kmem_cache_alloc(journal_head_cache, GFP_NOFS);
-        if (ret == 0) {
+        if (ret == NULL) {
                 jbd_debug(1, "out of memory for journal_head\n");
                 if (time_after(jiffies, last_warning + 5*HZ)) {
                         printk(KERN_NOTICE "ENOMEM in %s, retrying.\n",
                                __FUNCTION__);
                         last_warning = jiffies;
                 }
-                while (ret == 0) {
+                while (ret == NULL) {
                         yield();
                         ret = kmem_cache_alloc(journal_head_cache, GFP_NOFS);
                 }
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 0282deb8ff2d..9841b1e5af03 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -1172,7 +1172,7 @@ int journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
         }
 
         /* That test should have eliminated the following case: */
-        J_ASSERT_JH(jh, jh->b_frozen_data == 0);
+        J_ASSERT_JH(jh, jh->b_frozen_data == NULL);
 
         JBUFFER_TRACE(jh, "file as BJ_Metadata");
         spin_lock(&journal->j_list_lock);
@@ -1522,7 +1522,7 @@ static void __journal_temp_unlink_buffer(struct journal_head *jh)
 
         J_ASSERT_JH(jh, jh->b_jlist < BJ_Types);
         if (jh->b_jlist != BJ_None)
-                J_ASSERT_JH(jh, transaction != 0);
+                J_ASSERT_JH(jh, transaction != NULL);
 
         switch (jh->b_jlist) {
         case BJ_None:
@@ -1591,11 +1591,11 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
         if (buffer_locked(bh) || buffer_dirty(bh))
                 goto out;
 
-        if (jh->b_next_transaction != 0)
+        if (jh->b_next_transaction != NULL)
                 goto out;
 
         spin_lock(&journal->j_list_lock);
-        if (jh->b_transaction != 0 && jh->b_cp_transaction == 0) {
+        if (jh->b_transaction != NULL && jh->b_cp_transaction == NULL) {
                 if (jh->b_jlist == BJ_SyncData || jh->b_jlist == BJ_Locked) {
                         /* A written-back ordered data buffer */
                         JBUFFER_TRACE(jh, "release data");
@@ -1603,7 +1603,7 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
                         journal_remove_journal_head(bh);
                         __brelse(bh);
                 }
-        } else if (jh->b_cp_transaction != 0 && jh->b_transaction == 0) {
+        } else if (jh->b_cp_transaction != NULL && jh->b_transaction == NULL) {
                 /* written-back checkpointed metadata buffer */
                 if (jh->b_jlist == BJ_None) {
                         JBUFFER_TRACE(jh, "remove from checkpoint list");
@@ -1963,7 +1963,7 @@ void __journal_file_buffer(struct journal_head *jh,
 
         J_ASSERT_JH(jh, jh->b_jlist < BJ_Types);
         J_ASSERT_JH(jh, jh->b_transaction == transaction ||
-                                jh->b_transaction == 0);
+                                jh->b_transaction == NULL);
 
         if (jh->b_transaction && jh->b_jlist == jlist)
                 return;