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Message-ID: <20061117035240.GA7484@elte.hu>
Date: Fri, 17 Nov 2006 04:52:40 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Linus Torvalds <torvalds@...l.org>
Cc: Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
linux-kernel@...r.kernel.org
Subject: Re: [patch] hotplug CPU: clean up hotcpu_notifier() use
* Linus Torvalds <torvalds@...l.org> wrote:
> > #ifdef CONFIG_HOTPLUG_CPU
> > mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
> > mp->m_icsb_notifier.priority = 0;
> > - register_hotcpu_notifier(&mp->m_icsb_notifier);
> > #endif /* CONFIG_HOTPLUG_CPU */
> > + register_hotcpu_notifier(&mp->m_icsb_notifier);
>
> That's just horrible. Now you "register" that notifier that you've
> never actually even initialized.
yeah - this could only be done cleanly if there was a 'set notifier
parameters and register it' call, but there isnt. Find below the patch
with this bit taken out. (and with the mce_amd.c fix merged in). It
still removes ~25 #ifdef blocks total.
Ingo
---------------------------->
Subject: [patch] hotplug CPU: clean up hotcpu_notifier() use
From: Ingo Molnar <mingo@...e.hu>
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
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/i386/kernel/cpu/mcheck/therm_throt.c | 2 --
arch/i386/kernel/cpuid.c | 2 --
arch/i386/kernel/microcode.c | 2 --
arch/i386/kernel/msr.c | 2 --
arch/ia64/kernel/palinfo.c | 2 --
arch/ia64/kernel/salinfo.c | 2 --
arch/s390/appldata/appldata_base.c | 2 --
arch/x86_64/kernel/mce.c | 2 --
arch/x86_64/kernel/mce_amd.c | 2 --
block/ll_rw_blk.c | 4 ----
drivers/cpufreq/cpufreq.c | 2 --
fs/buffer.c | 2 --
fs/xfs/xfs_mount.c | 4 +---
include/linux/cpu.h | 6 +++---
kernel/cpuset.c | 4 ----
kernel/profile.c | 3 +--
kernel/sched.c | 3 ---
kernel/workqueue.c | 2 --
lib/radix-tree.c | 2 --
mm/page_alloc.c | 4 ----
mm/swap.c | 2 ++
mm/vmscan.c | 2 --
net/core/dev.c | 2 --
net/core/flow.c | 2 --
24 files changed, 7 insertions(+), 55 deletions(-)
Index: linux/arch/i386/kernel/cpu/mcheck/therm_throt.c
===================================================================
--- linux.orig/arch/i386/kernel/cpu/mcheck/therm_throt.c
+++ linux/arch/i386/kernel/cpu/mcheck/therm_throt.c
@@ -115,7 +115,6 @@ static __cpuinit int thermal_throttle_ad
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);
@@ -152,7 +151,6 @@ static struct notifier_block thermal_thr
{
.notifier_call = thermal_throttle_cpu_callback,
};
-#endif /* CONFIG_HOTPLUG_CPU */
static __init int thermal_throttle_init_device(void)
{
Index: linux/arch/i386/kernel/cpuid.c
===================================================================
--- linux.orig/arch/i386/kernel/cpuid.c
+++ linux/arch/i386/kernel/cpuid.c
@@ -167,7 +167,6 @@ static int cpuid_class_device_create(int
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 __cpuinitda
{
.notifier_call = cpuid_class_cpu_callback,
};
-#endif /* !CONFIG_HOTPLUG_CPU */
static int __init cpuid_init(void)
{
Index: linux/arch/i386/kernel/microcode.c
===================================================================
--- linux.orig/arch/i386/kernel/microcode.c
+++ linux/arch/i386/kernel/microcode.c
@@ -703,7 +703,6 @@ static struct sysdev_driver mc_sysdev_dr
.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 *n
static struct notifier_block mc_cpu_notifier = {
.notifier_call = mc_cpu_callback,
};
-#endif
static int __init microcode_init (void)
{
Index: linux/arch/i386/kernel/msr.c
===================================================================
--- linux.orig/arch/i386/kernel/msr.c
+++ linux/arch/i386/kernel/msr.c
@@ -250,7 +250,6 @@ static int msr_class_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 __cpuinitda
{
.notifier_call = msr_class_cpu_callback,
};
-#endif
static int __init msr_init(void)
{
Index: linux/arch/ia64/kernel/palinfo.c
===================================================================
--- linux.orig/arch/ia64/kernel/palinfo.c
+++ linux/arch/ia64/kernel/palinfo.c
@@ -952,7 +952,6 @@ remove_palinfo_proc_entries(unsigned int
}
}
-#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_call = palinfo_cpu_callback,
.priority = 0,
};
-#endif
static int __init
palinfo_init(void)
Index: linux/arch/ia64/kernel/salinfo.c
===================================================================
--- linux.orig/arch/ia64/kernel/salinfo.c
+++ linux/arch/ia64/kernel/salinfo.c
@@ -575,7 +575,6 @@ static struct file_operations salinfo_da
.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_call = salinfo_cpu_callback,
.priority = 0,
};
-#endif /* CONFIG_HOTPLUG_CPU */
static int __init
salinfo_init(void)
Index: linux/arch/s390/appldata/appldata_base.c
===================================================================
--- linux.orig/arch/s390/appldata/appldata_base.c
+++ linux/arch/s390/appldata/appldata_base.c
@@ -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_bloc
static struct notifier_block appldata_nb = {
.notifier_call = appldata_cpu_notify,
};
-#endif
/*
* appldata_init()
Index: linux/arch/x86_64/kernel/mce.c
===================================================================
--- linux.orig/arch/x86_64/kernel/mce.c
+++ linux/arch/x86_64/kernel/mce.c
@@ -641,7 +641,6 @@ static __cpuinit int mce_create_device(u
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 *
static struct notifier_block mce_cpu_notifier = {
.notifier_call = mce_cpu_callback,
};
-#endif
static __init int mce_init_device(void)
{
Index: linux/arch/x86_64/kernel/mce_amd.c
===================================================================
--- linux.orig/arch/x86_64/kernel/mce_amd.c
+++ linux/arch/x86_64/kernel/mce_amd.c
@@ -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
@@ -593,12 +593,14 @@ static void threshold_remove_bank(unsign
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 +655,6 @@ static int threshold_cpu_callback(struct
static struct notifier_block threshold_cpu_notifier = {
.notifier_call = threshold_cpu_callback,
};
-#endif /* CONFIG_HOTPLUG_CPU */
static __init int threshold_init_device(void)
{
Index: linux/block/ll_rw_blk.c
===================================================================
--- linux.orig/block/ll_rw_blk.c
+++ linux/block/ll_rw_blk.c
@@ -3374,8 +3374,6 @@ static void blk_done_softirq(struct soft
}
}
-#ifdef CONFIG_HOTPLUG_CPU
-
static int blk_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
{
@@ -3401,8 +3399,6 @@ static struct notifier_block __devinitda
.notifier_call = blk_cpu_notify,
};
-#endif /* CONFIG_HOTPLUG_CPU */
-
/**
* blk_complete_request - end I/O on a request
* @req: the request being processed
Index: linux/drivers/cpufreq/cpufreq.c
===================================================================
--- linux.orig/drivers/cpufreq/cpufreq.c
+++ linux/drivers/cpufreq/cpufreq.c
@@ -1535,7 +1535,6 @@ int cpufreq_update_policy(unsigned int c
}
EXPORT_SYMBOL(cpufreq_update_policy);
-#ifdef CONFIG_HOTPLUG_CPU
static int cpufreq_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -1575,7 +1574,6 @@ static struct notifier_block __cpuinitda
{
.notifier_call = cpufreq_cpu_callback,
};
-#endif /* CONFIG_HOTPLUG_CPU */
/*********************************************************************
* REGISTER / UNREGISTER CPUFREQ DRIVER *
Index: linux/fs/buffer.c
===================================================================
--- linux.orig/fs/buffer.c
+++ linux/fs/buffer.c
@@ -2972,7 +2972,6 @@ init_buffer_head(void *data, kmem_cache_
}
}
-#ifdef CONFIG_HOTPLUG_CPU
static void buffer_exit_cpu(int cpu)
{
int i;
@@ -2994,7 +2993,6 @@ static int buffer_cpu_notify(struct noti
buffer_exit_cpu((unsigned long)hcpu);
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
void __init buffer_init(void)
{
Index: linux/include/linux/cpu.h
===================================================================
--- linux.orig/include/linux/cpu.h
+++ linux/include/linux/cpu.h
@@ -81,9 +81,9 @@ 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; }
Index: linux/kernel/cpuset.c
===================================================================
--- linux.orig/kernel/cpuset.c
+++ linux/kernel/cpuset.c
@@ -2045,7 +2045,6 @@ 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,
@@ -2109,9 +2108,7 @@ static void common_cpu_mem_hotplug_unplu
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
@@ -2128,7 +2125,6 @@ static int cpuset_handle_cpuhp(struct no
common_cpu_mem_hotplug_unplug();
return 0;
}
-#endif
#ifdef CONFIG_MEMORY_HOTPLUG
/*
Index: linux/kernel/profile.c
===================================================================
--- linux.orig/kernel/profile.c
+++ linux/kernel/profile.c
@@ -298,7 +298,6 @@ out:
put_cpu();
}
-#ifdef CONFIG_HOTPLUG_CPU
static int __devinit profile_cpu_callback(struct notifier_block *info,
unsigned long action, void *__cpu)
{
@@ -351,10 +350,10 @@ static int __devinit profile_cpu_callbac
}
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_hit(int type, void *__pc)
{
Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -6723,8 +6723,6 @@ SYSDEV_ATTR(sched_smt_power_savings, 064
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
@@ -6757,7 +6755,6 @@ static int update_sched_domains(struct n
return NOTIFY_OK;
}
-#endif
void __init sched_init_smp(void)
{
Index: linux/kernel/workqueue.c
===================================================================
--- linux.orig/kernel/workqueue.c
+++ linux/kernel/workqueue.c
@@ -609,7 +609,6 @@ 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)
{
@@ -692,7 +691,6 @@ static int __devinit workqueue_cpu_callb
return NOTIFY_OK;
}
-#endif
void init_workqueues(void)
{
Index: linux/lib/radix-tree.c
===================================================================
--- linux.orig/lib/radix-tree.c
+++ linux/lib/radix-tree.c
@@ -869,7 +869,6 @@ static __init void radix_tree_init_maxin
height_to_maxindex[i] = __maxindex(i);
}
-#ifdef CONFIG_HOTPLUG_CPU
static int radix_tree_callback(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
@@ -889,7 +888,6 @@ static int radix_tree_callback(struct no
}
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
void __init radix_tree_init(void)
{
Index: linux/mm/page_alloc.c
===================================================================
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -700,7 +700,6 @@ 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;
@@ -722,7 +721,6 @@ static void __drain_pages(unsigned int c
}
}
}
-#endif /* CONFIG_PM || CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_PM
@@ -2736,7 +2734,6 @@ void __init free_area_init(unsigned long
__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)
{
@@ -2751,7 +2748,6 @@ static int page_alloc_cpu_notify(struct
}
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
void __init page_alloc_init(void)
{
Index: linux/mm/swap.c
===================================================================
--- linux.orig/mm/swap.c
+++ linux/mm/swap.c
@@ -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
}
Index: linux/mm/vmscan.c
===================================================================
--- linux.orig/mm/vmscan.c
+++ linux/mm/vmscan.c
@@ -1508,7 +1508,6 @@ 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,
@@ -1529,7 +1528,6 @@ static int __devinit cpu_callback(struct
}
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
/*
* This kswapd start function will be called by init and node-hot-add.
Index: linux/net/core/dev.c
===================================================================
--- linux.orig/net/core/dev.c
+++ linux/net/core/dev.c
@@ -3361,7 +3361,6 @@ void unregister_netdev(struct net_device
EXPORT_SYMBOL(unregister_netdev);
-#ifdef CONFIG_HOTPLUG_CPU
static int dev_cpu_callback(struct notifier_block *nfb,
unsigned long action,
void *ocpu)
@@ -3405,7 +3404,6 @@ static int dev_cpu_callback(struct notif
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_NET_DMA
/**
Index: linux/net/core/flow.c
===================================================================
--- linux.orig/net/core/flow.c
+++ linux/net/core/flow.c
@@ -340,7 +340,6 @@ static void __devinit flow_cache_cpu_pre
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 notifie
__flow_cache_shrink((unsigned long)hcpu, 0);
return NOTIFY_OK;
}
-#endif /* CONFIG_HOTPLUG_CPU */
static int __init flow_cache_init(void)
{
-
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