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[PATCH] hotplug CPU: clean up hotcpu_notifier() use

Browse source 
There was lots of #ifdef noise in the kernel due to hotcpu_notifier(fn,
prio) not correctly marking 'fn' as used in the !HOTPLUG_CPU case, and thus
generating compiler warnings of unused symbols, hence forcing people to add
#ifdefs.

the compiler can skip truly unused functions just fine:

    text    data     bss     dec     hex filename
 1624412  728710 3674856 6027978  5bfaca vmlinux.before
 1624412  728710 3674856 6027978  5bfaca vmlinux.after

[akpm@osdl.org: topology.c fix]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-12-06 20:38:17 -08:00 committed by Linus Torvalds
parent a38a44c1a9
commit 0231606785
25 changed files with 8 additions and 56 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/i386/kernel/cpu/mcheck/therm_throt.c
View file

@ -116,7 +116,6 @@ static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
return sysfs_create_group(&sys_dev->kobj, &thermal_throttle_attr_group);
}
#ifdef CONFIG_HOTPLUG_CPU
static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
{
return sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
@ -153,7 +152,6 @@ static struct notifier_block thermal_throttle_cpu_notifier =
{
.notifier_call = thermal_throttle_cpu_callback,
};
#endif /* CONFIG_HOTPLUG_CPU */
static __init int thermal_throttle_init_device(void)
{

2
arch/i386/kernel/cpuid.c
View file

@ -167,7 +167,6 @@ static int cpuid_device_create(int i)
return err;
}
#ifdef CONFIG_HOTPLUG_CPU
static int cpuid_class_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
@ -187,7 +186,6 @@ static struct notifier_block __cpuinitdata cpuid_class_cpu_notifier =
{
.notifier_call = cpuid_class_cpu_callback,
};
#endif /* !CONFIG_HOTPLUG_CPU */
static int __init cpuid_init(void)
{

2
arch/i386/kernel/microcode.c
View file

@ -703,7 +703,6 @@ static struct sysdev_driver mc_sysdev_driver = {
.resume = mc_sysdev_resume,
};
#ifdef CONFIG_HOTPLUG_CPU
static __cpuinit int
mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
{
@ -726,7 +725,6 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
static struct notifier_block mc_cpu_notifier = {
.notifier_call = mc_cpu_callback,
};
#endif
static int __init microcode_init (void)
{

2
arch/i386/kernel/msr.c
View file

@ -250,7 +250,6 @@ static int msr_device_create(int i)
return err;
}
#ifdef CONFIG_HOTPLUG_CPU
static int msr_class_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@ -271,7 +270,6 @@ static struct notifier_block __cpuinitdata msr_class_cpu_notifier =
{
.notifier_call = msr_class_cpu_callback,
};
#endif
static int __init msr_init(void)
{

2
arch/ia64/kernel/palinfo.c
View file

@ -952,7 +952,6 @@ remove_palinfo_proc_entries(unsigned int hcpu)
}
}
#ifdef CONFIG_HOTPLUG_CPU
static int palinfo_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@ -974,7 +973,6 @@ static struct notifier_block palinfo_cpu_notifier =
.notifier_call = palinfo_cpu_callback,
.priority = 0,
};
#endif
static int __init
palinfo_init(void)

2
arch/ia64/kernel/salinfo.c
View file

@ -575,7 +575,6 @@ static struct file_operations salinfo_data_fops = {
.write = salinfo_log_write,
};
#ifdef CONFIG_HOTPLUG_CPU
static int __devinit
salinfo_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
{
@ -620,7 +619,6 @@ static struct notifier_block salinfo_cpu_notifier =
.notifier_call = salinfo_cpu_callback,
.priority = 0,
};
#endif /* CONFIG_HOTPLUG_CPU */
static int __init
salinfo_init(void)

2
arch/s390/appldata/appldata_base.c
View file

@ -561,7 +561,6 @@ appldata_offline_cpu(int cpu)
spin_unlock(&appldata_timer_lock);
}
#ifdef CONFIG_HOTPLUG_CPU
static int __cpuinit
appldata_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
@ -582,7 +581,6 @@ appldata_cpu_notify(struct notifier_block *self,
static struct notifier_block appldata_nb = {
.notifier_call = appldata_cpu_notify,
};
#endif
/*
* appldata_init()

2
arch/x86_64/kernel/mce.c
View file

@ -641,7 +641,6 @@ static __cpuinit int mce_create_device(unsigned int cpu)
return err;
}
#ifdef CONFIG_HOTPLUG_CPU
static void mce_remove_device(unsigned int cpu)
{
int i;
@ -674,7 +673,6 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
static struct notifier_block mce_cpu_notifier = {
.notifier_call = mce_cpu_callback,
};
#endif
static __init int mce_init_device(void)
{

4
arch/x86_64/kernel/mce_amd.c
View file

@ -551,7 +551,6 @@ out:
return err;
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* let's be hotplug friendly.
* in case of multiple core processors, the first core always takes ownership
@ -594,12 +593,14 @@ static void threshold_remove_bank(unsigned int cpu, int bank)
sprintf(name, "threshold_bank%i", bank);
#ifdef CONFIG_SMP
/* sibling symlink */
if (shared_bank[bank] && b->blocks->cpu != cpu) {
sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
per_cpu(threshold_banks, cpu)[bank] = NULL;
return;
}
#endif
/* remove all sibling symlinks before unregistering */
for_each_cpu_mask(i, b->cpus) {
@ -656,7 +657,6 @@ static int threshold_cpu_callback(struct notifier_block *nfb,
static struct notifier_block threshold_cpu_notifier = {
.notifier_call = threshold_cpu_callback,
};
#endif /* CONFIG_HOTPLUG_CPU */
static __init int threshold_init_device(void)
{

2
arch/x86_64/kernel/vsyscall.c
View file

@ -275,7 +275,6 @@ static void __cpuinit cpu_vsyscall_init(void *arg)
vsyscall_set_cpu(raw_smp_processor_id());
}
#ifdef CONFIG_HOTPLUG_CPU
static int __cpuinit
cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg)
{
@ -284,7 +283,6 @@ cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg)
smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 0, 1);
return NOTIFY_DONE;
}
#endif
static void __init map_vsyscall(void)
{

4
block/ll_rw_blk.c
View file

@ -3459,8 +3459,6 @@ static void blk_done_softirq(struct softirq_action *h)
}
}
#ifdef CONFIG_HOTPLUG_CPU
static int blk_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
{
@ -3486,8 +3484,6 @@ static struct notifier_block __devinitdata blk_cpu_notifier = {
.notifier_call = blk_cpu_notify,
};
#endif /* CONFIG_HOTPLUG_CPU */
/**
* blk_complete_request - end I/O on a request
* @req: the request being processed

2
drivers/base/topology.c
View file

@ -108,7 +108,6 @@ static int __cpuinit topology_add_dev(unsigned int cpu)
return rc;
}
#ifdef CONFIG_HOTPLUG_CPU
static void __cpuinit topology_remove_dev(unsigned int cpu)
{
struct sys_device *sys_dev = get_cpu_sysdev(cpu);
@ -136,7 +135,6 @@ static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
}
return rc ? NOTIFY_BAD : NOTIFY_OK;
}
#endif
static int __cpuinit topology_sysfs_init(void)
{

2
drivers/cpufreq/cpufreq.c
View file

@ -1537,7 +1537,6 @@ int cpufreq_update_policy(unsigned int cpu)
}
EXPORT_SYMBOL(cpufreq_update_policy);
#ifdef CONFIG_HOTPLUG_CPU
static int cpufreq_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@ -1577,7 +1576,6 @@ static struct notifier_block __cpuinitdata cpufreq_cpu_notifier =
{
.notifier_call = cpufreq_cpu_callback,
};
#endif /* CONFIG_HOTPLUG_CPU */
/*********************************************************************
* REGISTER / UNREGISTER CPUFREQ DRIVER *

2
fs/buffer.c
View file

@ -2972,7 +2972,6 @@ init_buffer_head(void *data, struct kmem_cache *cachep, unsigned long flags)
}
}
#ifdef CONFIG_HOTPLUG_CPU
static void buffer_exit_cpu(int cpu)
{
int i;
@ -2994,7 +2993,6 @@ static int buffer_cpu_notify(struct notifier_block *self,
buffer_exit_cpu((unsigned long)hcpu);
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
void __init buffer_init(void)
{

6
include/linux/cpu.h
View file

@ -89,9 +89,9 @@ int cpu_down(unsigned int cpu);
#define lock_cpu_hotplug() do { } while (0)
#define unlock_cpu_hotplug() do { } while (0)
#define lock_cpu_hotplug_interruptible() 0
#define hotcpu_notifier(fn, pri) do { } while (0)
#define register_hotcpu_notifier(nb) do { } while (0)
#define unregister_hotcpu_notifier(nb) do { } while (0)
#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
#define register_hotcpu_notifier(nb) do { (void)(nb); } while (0)
#define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
static inline int cpu_is_offline(int cpu) { return 0; }

4
kernel/cpuset.c
View file

@ -2044,7 +2044,6 @@ out:
return err;
}
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_MEMORY_HOTPLUG)
/*
* If common_cpu_mem_hotplug_unplug(), below, unplugs any CPUs
* or memory nodes, we need to walk over the cpuset hierarchy,
@ -2108,9 +2107,7 @@ static void common_cpu_mem_hotplug_unplug(void)
mutex_unlock(&callback_mutex);
mutex_unlock(&manage_mutex);
}
#endif
#ifdef CONFIG_HOTPLUG_CPU
/*
* The top_cpuset tracks what CPUs and Memory Nodes are online,
* period. This is necessary in order to make cpusets transparent
@ -2127,7 +2124,6 @@ static int cpuset_handle_cpuhp(struct notifier_block *nb,
common_cpu_mem_hotplug_unplug();
return 0;
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
/*

3
kernel/profile.c
View file

@ -319,7 +319,6 @@ out:
put_cpu();
}
#ifdef CONFIG_HOTPLUG_CPU
static int __devinit profile_cpu_callback(struct notifier_block *info,
unsigned long action, void *__cpu)
{
@ -372,10 +371,10 @@ static int __devinit profile_cpu_callback(struct notifier_block *info,
}
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
#else /* !CONFIG_SMP */
#define profile_flip_buffers() do { } while (0)
#define profile_discard_flip_buffers() do { } while (0)
#define profile_cpu_callback NULL
void profile_hits(int type, void *__pc, unsigned int nr_hits)
{

3
kernel/sched.c
View file

@ -6740,8 +6740,6 @@ SYSDEV_ATTR(sched_smt_power_savings, 0644, sched_smt_power_savings_show,
sched_smt_power_savings_store);
#endif
#ifdef CONFIG_HOTPLUG_CPU
/*
* Force a reinitialization of the sched domains hierarchy. The domains
* and groups cannot be updated in place without racing with the balancing
@ -6774,7 +6772,6 @@ static int update_sched_domains(struct notifier_block *nfb,
return NOTIFY_OK;
}
#endif
void __init sched_init_smp(void)
{

2
kernel/workqueue.c
View file

@ -655,7 +655,6 @@ int current_is_keventd(void)
}
#ifdef CONFIG_HOTPLUG_CPU
/* Take the work from this (downed) CPU. */
static void take_over_work(struct workqueue_struct *wq, unsigned int cpu)
{
@ -738,7 +737,6 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
return NOTIFY_OK;
}
#endif
void init_workqueues(void)
{

2
lib/radix-tree.c
View file

@ -996,7 +996,6 @@ static __init void radix_tree_init_maxindex(void)
height_to_maxindex[i] = __maxindex(i);
}
#ifdef CONFIG_HOTPLUG_CPU
static int radix_tree_callback(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
@ -1016,7 +1015,6 @@ static int radix_tree_callback(struct notifier_block *nfb,
}
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
void __init radix_tree_init(void)
{

4
mm/page_alloc.c
View file

@ -701,7 +701,6 @@ void drain_node_pages(int nodeid)
}
#endif
#if defined(CONFIG_PM) || defined(CONFIG_HOTPLUG_CPU)
static void __drain_pages(unsigned int cpu)
{
unsigned long flags;
@ -723,7 +722,6 @@ static void __drain_pages(unsigned int cpu)
}
}
}
#endif /* CONFIG_PM || CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_PM
@ -2907,7 +2905,6 @@ void __init free_area_init(unsigned long *zones_size)
__pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL);
}
#ifdef CONFIG_HOTPLUG_CPU
static int page_alloc_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
@ -2922,7 +2919,6 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
}
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
void __init page_alloc_init(void)
{

2
mm/swap.c
View file

@ -514,5 +514,7 @@ void __init swap_setup(void)
* Right now other parts of the system means that we
* _really_ don't want to cluster much more
*/
#ifdef CONFIG_HOTPLUG_CPU
hotcpu_notifier(cpu_swap_callback, 0);
#endif
}

2
mm/vmscan.c
View file

@ -1513,7 +1513,6 @@ out:
}
#endif
#ifdef CONFIG_HOTPLUG_CPU
/* It's optimal to keep kswapds on the same CPUs as their memory, but
not required for correctness. So if the last cpu in a node goes
away, we get changed to run anywhere: as the first one comes back,
@ -1534,7 +1533,6 @@ static int __devinit cpu_callback(struct notifier_block *nfb,
}
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
/*
* This kswapd start function will be called by init and node-hot-add.

2
net/core/dev.c
View file

@ -3340,7 +3340,6 @@ void unregister_netdev(struct net_device *dev)
EXPORT_SYMBOL(unregister_netdev);
#ifdef CONFIG_HOTPLUG_CPU
static int dev_cpu_callback(struct notifier_block *nfb,
unsigned long action,
void *ocpu)
@ -3384,7 +3383,6 @@ static int dev_cpu_callback(struct notifier_block *nfb,
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_NET_DMA
/**

2
net/core/flow.c
View file

@ -340,7 +340,6 @@ static void __devinit flow_cache_cpu_prepare(int cpu)
tasklet_init(tasklet, flow_cache_flush_tasklet, 0);
}
#ifdef CONFIG_HOTPLUG_CPU
static int flow_cache_cpu(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
@ -349,7 +348,6 @@ static int flow_cache_cpu(struct notifier_block *nfb,
__flow_cache_shrink((unsigned long)hcpu, 0);
return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */
static int __init flow_cache_init(void)
{