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>

20 files changed, 34 insertions, 33 deletions

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index cf7a47b35e10..585541ca1a7e 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -172,7 +172,7 @@ time_t __vsyscall(1) vtime(time_t *t)
         if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
                 return time_syscall(t);
 
-        vgettimeofday(&tv, 0);
+        vgettimeofday(&tv, NULL);
         result = tv.tv_sec;
         if (t)
                 *t = result;
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 026439e05afe..c7501058d07d 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -882,7 +882,7 @@ unsigned long ata_pci_default_filter(struct ata_device *adev, unsigned long xfer
         /* Filter out DMA modes if the device has been configured by
            the BIOS as PIO only */
 
-        if (adev->link->ap->ioaddr.bmdma_addr == 0)
+        if (adev->link->ap->ioaddr.bmdma_addr == NULL)
                 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
         return xfer_mask;
 }
diff --git a/drivers/base/dmapool.c b/drivers/base/dmapool.c
index fbae8674e491..5beddc322e6f 100644
--- a/drivers/base/dmapool.c
+++ b/drivers/base/dmapool.c
@@ -366,7 +366,7 @@ dma_pool_free (struct dma_pool *pool, void *vaddr, dma_addr_t dma)
         unsigned long           flags;
         int                     map, block;
 
-        if ((page = pool_find_page (pool, dma)) == 0) {
+        if ((page = pool_find_page(pool, dma)) == NULL) {
                 if (pool->dev)
                         dev_err(pool->dev, "dma_pool_free %s, %p/%lx (bad dma)\n",
                                 pool->name, vaddr, (unsigned long) dma);
diff --git a/drivers/char/random.c b/drivers/char/random.c
index af274e5a25ee..1756b1f7cb72 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -649,7 +649,7 @@ EXPORT_SYMBOL_GPL(add_input_randomness);
 
 void add_interrupt_randomness(int irq)
 {
-        if (irq >= NR_IRQS || irq_timer_state[irq] == 0)
+        if (irq >= NR_IRQS || irq_timer_state[irq] == NULL)
                 return;
 
         DEBUG_ENT("irq event %d\n", irq);
diff --git a/fs/autofs/waitq.c b/fs/autofs/waitq.c
index 19a9cafb5ddf..be46805972f0 100644
--- a/fs/autofs/waitq.c
+++ b/fs/autofs/waitq.c
@@ -182,7 +182,7 @@ int autofs_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_toke
 {
         struct autofs_wait_queue *wq, **wql;
 
-        for ( wql = &sbi->queues ; (wq = *wql) != 0 ; wql = &wq->next ) {
+        for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
                 if ( wq->wait_queue_token == wait_queue_token )
                         break;
         }
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 0d041a9cb348..1fe28e4754c2 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -376,7 +376,7 @@ int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_tok
         struct autofs_wait_queue *wq, **wql;
 
         mutex_lock(&sbi->wq_mutex);
-        for (wql = &sbi->queues ; (wq = *wql) != 0 ; wql = &wq->next) {
+        for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
                 if (wq->wait_queue_token == wait_queue_token)
                         break;
         }
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 6dacd39bf048..a4284ccac1f9 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -3001,7 +3001,7 @@ static int __init init_sys32_ioctl(void)
         int i;
 
         for (i = 0; i < ARRAY_SIZE(ioctl_start); i++) {
-                if (ioctl_start[i].next != 0) {
+                if (ioctl_start[i].next) {
                         printk("ioctl translation %d bad\n",i);
                         return -1;
                 }
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 77b9953624f4..de6189291954 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -463,7 +463,7 @@ static void ep_free(struct eventpoll *ep)
          * holding "epmutex" we can be sure that no file cleanup code will hit
          * us during this operation. So we can avoid the lock on "ep->lock".
          */
-        while ((rbp = rb_first(&ep->rbr)) != 0) {
+        while ((rbp = rb_first(&ep->rbr)) != NULL) {
                 epi = rb_entry(rbp, struct epitem, rbn);
                 ep_remove(ep, epi);
         }
diff --git a/fs/ext3/fsync.c b/fs/ext3/fsync.c
index dd1fd3c0fc05..a588e23841d4 100644
--- a/fs/ext3/fsync.c
+++ b/fs/ext3/fsync.c
@@ -47,7 +47,7 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
         struct inode *inode = dentry->d_inode;
         int ret = 0;
 
-        J_ASSERT(ext3_journal_current_handle() == 0);
+        J_ASSERT(ext3_journal_current_handle() == NULL);
 
         /*
          * data=writeback:
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 2f2b6864db10..3dec003b773e 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1028,7 +1028,7 @@ struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode,
                 }
                 if (buffer_new(&dummy)) {
                         J_ASSERT(create != 0);
-                        J_ASSERT(handle != 0);
+                        J_ASSERT(handle != NULL);
 
                         /*
                          * Now that we do not always journal data, we should
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;
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
index e7905816c4ca..64965e1c21c4 100644
--- a/fs/nls/nls_base.c
+++ b/fs/nls/nls_base.c
@@ -111,7 +111,7 @@ utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
         int c, nc;
         const struct utf8_table *t;
   
-        if (s == 0)
+        if (!s)
                 return 0;
   
         l = wc;
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index ed652f40f075..3ac5904d1b12 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -57,7 +57,7 @@ identify_ramdisk_image(int fd, int start_block)
         unsigned char *buf;
 
         buf = kmalloc(size, GFP_KERNEL);
-        if (buf == 0)
+        if (!buf)
                 return -1;
 
         minixsb = (struct minix_super_block *) buf;
@@ -407,12 +407,12 @@ static int __init crd_load(int in_fd, int out_fd)
         crd_infd = in_fd;
         crd_outfd = out_fd;
         inbuf = kmalloc(INBUFSIZ, GFP_KERNEL);
-        if (inbuf == 0) {
+        if (!inbuf) {
                 printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n");
                 return -1;
         }
         window = kmalloc(WSIZE, GFP_KERNEL);
-        if (window == 0) {
+        if (!window) {
                 printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n");
                 kfree(inbuf);
                 return -1;
diff --git a/kernel/futex.c b/kernel/futex.c
index d725676d84f3..e45a65e41686 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -293,7 +293,7 @@ EXPORT_SYMBOL_GPL(get_futex_key_refs);
  */
 void drop_futex_key_refs(union futex_key *key)
 {
-        if (key->both.ptr == 0)
+        if (!key->both.ptr)
                 return;
         switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
                 case FUT_OFF_INODE:
@@ -1046,7 +1046,7 @@ static int unqueue_me(struct futex_q *q)
  retry:
         lock_ptr = q->lock_ptr;
         barrier();
-        if (lock_ptr != 0) {
+        if (lock_ptr != NULL) {
                 spin_lock(lock_ptr);
                 /*
                  * q->lock_ptr can change between reading it and
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 7885269b0da2..e9f1b4ea504d 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -785,7 +785,7 @@ static int kimage_load_normal_segment(struct kimage *image,
                 size_t uchunk, mchunk;
 
                 page = kimage_alloc_page(image, GFP_HIGHUSER, maddr);
-                if (page == 0) {
+                if (!page) {
                         result  = -ENOMEM;
                         goto out;
                 }
@@ -844,7 +844,7 @@ static int kimage_load_crash_segment(struct kimage *image,
                 size_t uchunk, mchunk;
 
                 page = pfn_to_page(maddr >> PAGE_SHIFT);
-                if (page == 0) {
+                if (!page) {
                         result  = -ENOMEM;
                         goto out;
                 }
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ae2959bb59cb..034617f8cdb2 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1020,7 +1020,7 @@ static long region_chg(struct list_head *head, long f, long t)
          * size such that we can guarentee to record the reservation. */
         if (&rg->link == head || t < rg->from) {
                 nrg = kmalloc(sizeof(*nrg), GFP_KERNEL);
-                if (nrg == 0)
+                if (!nrg)
                         return -ENOMEM;
                 nrg->from = f;
                 nrg->to   = f;
diff --git a/mm/mremap.c b/mm/mremap.c
index 8ea5c2412c6e..08e3c7f2bd15 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -291,7 +291,7 @@ unsigned long do_mremap(unsigned long addr,
                 if ((addr <= new_addr) && (addr+old_len) > new_addr)
                         goto out;
 
-                ret = security_file_mmap(0, 0, 0, 0, new_addr, 1);
+                ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1);
                 if (ret)
                         goto out;
 
@@ -399,7 +399,7 @@ unsigned long do_mremap(unsigned long addr,
                                 goto out;
                         }
 
-                        ret = security_file_mmap(0, 0, 0, 0, new_addr, 1);
+                        ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1);
                         if (ret)
                                 goto out;
                 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e1471385d001..cb474cc99645 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1282,7 +1282,7 @@ out:
          */
         if (priority < 0)
                 priority = 0;
-        for (i = 0; zones[i] != 0; i++) {
+        for (i = 0; zones[i] != NULL; i++) {
                 struct zone *zone = zones[i];
 
                 if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index cb008d9f0a82..36a191e7004e 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -448,7 +448,7 @@ int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
         if (dst) {
                 struct dst_entry *dst_test;
 
-                for (dst_test = dst; dst_test != 0;
+                for (dst_test = dst; dst_test != NULL;
                      dst_test = dst_test->child) {
                         struct xfrm_state *x = dst_test->xfrm;