sparse: fix pointer/integer confusion

I don't think we're in K&R any more, Toto.

If you want a NULL pointer, use NULL. Don't use an integer.

Most of the users really didn't seem to know the proper type.

arch/ppc64/kernel/dma.c

@@ -43,7 +43,7 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 	if (dev->bus == &vio_bus_type)
 		return vio_alloc_consistent(to_vio_dev(dev), size, dma_handle);
 	BUG();
-	return 0;
+	return NULL;
 }
 EXPORT_SYMBOL(dma_alloc_coherent);
 

arch/ppc64/kernel/ioctl32.c

@@ -29,7 +29,7 @@
 #define CODE
 #include "compat_ioctl.c"
 
-#define HANDLE_IOCTL(cmd,handler) { cmd, (ioctl_trans_handler_t)handler, 0 },
+#define HANDLE_IOCTL(cmd,handler) { cmd, (ioctl_trans_handler_t)handler, NULL },
 #define COMPATIBLE_IOCTL(cmd) HANDLE_IOCTL(cmd,sys_ioctl)
 
 #define IOCTL_TABLE_START \

arch/ppc64/kernel/irq.c

@@ -855,7 +855,7 @@ void init_irq_proc (void)
 	int i;
 
 	/* create /proc/irq */
-	root_irq_dir = proc_mkdir("irq", 0);
+	root_irq_dir = proc_mkdir("irq", NULL);
 
 	/* create /proc/irq/prof_cpu_mask */
 	entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);

arch/ppc64/kernel/traps.c

@@ -285,7 +285,7 @@ UnknownException(struct pt_regs *regs)
 	info.si_signo = SIGTRAP;
 	info.si_errno = 0;
 	info.si_code = 0;
-	info.si_addr = 0;
+	info.si_addr = NULL;
 	_exception(SIGTRAP, &info, regs);	
 }
 

fs/binfmt_script.c

@@ -50,7 +50,7 @@ static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)
 	if (*cp == '\0') 
 		return -ENOEXEC; /* No interpreter name found */
 	i_name = cp;
-	i_arg = 0;
+	i_arg = NULL;
 	for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++)
 		/* nothing */ ;
 	while ((*cp == ' ') || (*cp == '\t'))

fs/buffer.c

@@ -1420,7 +1420,7 @@ struct bh_lru {
 	struct buffer_head *bhs[BH_LRU_SIZE];
 };
 
-static DEFINE_PER_CPU(struct bh_lru, bh_lrus) = {{0}};
+static DEFINE_PER_CPU(struct bh_lru, bh_lrus) = {{ NULL }};
 
 #ifdef CONFIG_SMP
 #define bh_lru_lock()	local_irq_disable()
@@ -2487,7 +2487,7 @@ int nobh_prepare_write(struct page *page, unsigned from, unsigned to,
 			}
 			bh->b_state = map_bh.b_state;
 			atomic_set(&bh->b_count, 0);
-			bh->b_this_page = 0;
+			bh->b_this_page = NULL;
 			bh->b_page = page;
 			bh->b_blocknr = map_bh.b_blocknr;
 			bh->b_size = blocksize;

fs/compat.c

@@ -269,7 +269,7 @@ static void ioctl32_insert_translation(struct ioctl_trans *trans)
 		t = ioctl32_hash_table[hash];
 		while (t->next)
 			t = t->next;
-		trans->next = 0;
+		trans->next = NULL;
 		t->next = trans;
 	}
 }

fs/compat_ioctl.c

@@ -788,7 +788,7 @@ static int routing_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 			ret |= copy_from_user (devname, compat_ptr(rtdev), 15);
 			r4.rt_dev = devname; devname[15] = 0;
 		} else
-			r4.rt_dev = 0;
+			r4.rt_dev = NULL;
 
 		r = (void *) &r4;
 	}

fs/file.c

@@ -159,7 +159,7 @@ void free_fdset(fd_set *array, int num)
  */
 int expand_fdset(struct files_struct *files, int nr)
 {
-	fd_set *new_openset = 0, *new_execset = 0;
+	fd_set *new_openset = NULL, *new_execset = NULL;
 	int error, nfds = 0;
 
 	error = -EMFILE;

fs/locks.c

@@ -177,7 +177,7 @@ void locks_init_lock(struct file_lock *fl)
 	init_waitqueue_head(&fl->fl_wait);
 	fl->fl_next = NULL;
 	fl->fl_fasync = NULL;
-	fl->fl_owner = 0;
+	fl->fl_owner = NULL;
 	fl->fl_pid = 0;
 	fl->fl_file = NULL;
 	fl->fl_flags = 0;

fs/namespace.c

@@ -400,7 +400,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
 		down_write(&sb->s_umount);
 		if (!(sb->s_flags & MS_RDONLY)) {
 			lock_kernel();
-			retval = do_remount_sb(sb, MS_RDONLY, 0, 0);
+			retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);
 			unlock_kernel();
 		}
 		up_write(&sb->s_umount);

include/linux/hugetlb.h

@@ -75,7 +75,7 @@ static inline unsigned long hugetlb_total_pages(void)
 #define hugetlb_report_meminfo(buf)		0
 #define hugetlb_report_node_meminfo(n, buf)	0
 #define mark_mm_hugetlb(mm, vma)		do { } while (0)
-#define follow_huge_pmd(mm, addr, pmd, write)	0
+#define follow_huge_pmd(mm, addr, pmd, write)	NULL
 #define is_aligned_hugepage_range(addr, len)	0
 #define prepare_hugepage_range(addr, len)	(-EINVAL)
 #define pmd_huge(x)	0

init/do_mounts_initrd.c

@@ -58,7 +58,7 @@ static void __init handle_initrd(void)
 
 	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
 	if (pid > 0) {
-		while (pid != sys_wait4(-1, &i, 0, 0))
+		while (pid != sys_wait4(-1, &i, 0, NULL))
 			yield();
 	}
 

kernel/dma.c

@@ -58,14 +58,7 @@ struct dma_chan {
 };
 
 static struct dma_chan dma_chan_busy[MAX_DMA_CHANNELS] = {
-	{ 0, 0 },
-	{ 0, 0 },
-	{ 0, 0 },
-	{ 0, 0 },
-	{ 1, "cascade" },
-	{ 0, 0 },
-	{ 0, 0 },
-	{ 0, 0 }
+	[4] = { 1, "cascade" },
 };
 
 

kernel/itimer.c

@@ -134,7 +134,7 @@ asmlinkage long sys_setitimer(int which,
 	} else
 		memset((char *) &set_buffer, 0, sizeof(set_buffer));
 
-	error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : 0);
+	error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
 	if (error || !ovalue)
 		return error;
 

kernel/posix-timers.c

@@ -210,7 +210,7 @@ static __init int init_posix_timers(void)
 	register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
 
 	posix_timers_cache = kmem_cache_create("posix_timers_cache",
-					sizeof (struct k_itimer), 0, 0, 0, 0);
+					sizeof (struct k_itimer), 0, 0, NULL, NULL);
 	idr_init(&posix_timers_id);
 
 	return 0;
@@ -399,7 +399,7 @@ static struct k_itimer * alloc_posix_timer(void)
 	memset(tmr, 0, sizeof (struct k_itimer));
 	if (unlikely(!(tmr->sigq = sigqueue_alloc()))) {
 		kmem_cache_free(posix_timers_cache, tmr);
-		tmr = 0;
+		tmr = NULL;
 	}
 	return tmr;
 }
@@ -431,7 +431,7 @@ sys_timer_create(clockid_t which_clock,
 	int error = 0;
 	struct k_itimer *new_timer = NULL;
 	int new_timer_id;
-	struct task_struct *process = 0;
+	struct task_struct *process = NULL;
 	unsigned long flags;
 	sigevent_t event;
 	int it_id_set = IT_ID_NOT_SET;
@@ -521,7 +521,7 @@ sys_timer_create(clockid_t which_clock,
 				get_task_struct(process);
 			} else {
 				spin_unlock_irqrestore(&process->sighand->siglock, flags);
-				process = 0;
+				process = NULL;
 			}
 		}
 		read_unlock(&tasklist_lock);

kernel/signal.c

@@ -264,7 +264,7 @@ next_signal(struct sigpending *pending, sigset_t *mask)
 
 static struct sigqueue *__sigqueue_alloc(void)
 {
-	struct sigqueue *q = 0;
+	struct sigqueue *q = NULL;
 
 	if (atomic_read(&current->user->sigpending) <
 			current->rlim[RLIMIT_SIGPENDING].rlim_cur)
@@ -272,7 +272,7 @@ static struct sigqueue *__sigqueue_alloc(void)
 	if (q) {
 		INIT_LIST_HEAD(&q->list);
 		q->flags = 0;
-		q->lock = 0;
+		q->lock = NULL;
 		q->user = get_uid(current->user);
 		atomic_inc(&q->user->sigpending);
 	}
@@ -454,7 +454,7 @@ unblock_all_signals(void)
 
 static inline int collect_signal(int sig, struct sigpending *list, siginfo_t *info)
 {
-	struct sigqueue *q, *first = 0;
+	struct sigqueue *q, *first = NULL;
 	int still_pending = 0;
 
 	if (unlikely(!sigismember(&list->signal, sig)))

mm/memory.c

@@ -669,7 +669,7 @@ follow_page(struct mm_struct *mm, unsigned long address, int write)
 static inline struct page *get_page_map(struct page *page)
 {
 	if (!pfn_valid(page_to_pfn(page)))
-		return 0;
+		return NULL;
 	return page;
 }
 
@@ -1805,7 +1805,7 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
 #ifdef AT_SYSINFO_EHDR
 	return &gate_vma;
 #else
-	return 0;
+	return NULL;
 #endif
 }
 

mm/slab.c

@@ -474,7 +474,7 @@ struct cache_names {
 static struct cache_names __initdata cache_names[] = {
 #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" },
 #include <linux/kmalloc_sizes.h>
-	{ 0, }
+	{ NULL, }
 #undef CACHE
 };
 

mm/swapfile.c

@@ -1293,7 +1293,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
 	int i, prev;
 	int error;
 	static int least_priority;
-	union swap_header *swap_header = 0;
+	union swap_header *swap_header = NULL;
 	int swap_header_version;
 	int nr_good_pages = 0;
 	unsigned long maxpages = 1;