Eric Lee / smarc-ti-linux-kernel

Download as
Browse Code ยป

Commit d87aae2f3c8e90bd0fe03f5309b4d066b712b8ec

Authored by Al Viro
1 parent 4a55c1017b
Exists in master and in 20 other branches dlt-processor-sdk-linux-03.00.00.04, newt-ti-linux-3.12.y, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.12.10, smarc-ti-linux-3.12.y, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.12.y, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

switch the protection of percpu_counter list to spinlock 

... making percpu_counter_destroy() non-blocking

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Showing 1 changed file with 7 additions and 7 deletions Side-by-side Diff

lib/percpu_counter.c
Diff comments   View file @ d87aae2
... ... @@ -12,7 +12,7 @@
12 12  
13 13 #ifdef CONFIG_HOTPLUG_CPU
14 14 static LIST_HEAD(percpu_counters);
15   -static DEFINE_MUTEX(percpu_counters_lock);
  15 +static DEFINE_SPINLOCK(percpu_counters_lock);
16 16 #endif
17 17  
18 18 #ifdef CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER
19 19  
... ... @@ -123,9 +123,9 @@
123 123  
124 124 #ifdef CONFIG_HOTPLUG_CPU
125 125 INIT_LIST_HEAD(&fbc->list);
126   - mutex_lock(&percpu_counters_lock);
  126 + spin_lock(&percpu_counters_lock);
127 127 list_add(&fbc->list, &percpu_counters);
128   - mutex_unlock(&percpu_counters_lock);
  128 + spin_unlock(&percpu_counters_lock);
129 129 #endif
130 130 return 0;
131 131 }
132 132  
... ... @@ -139,9 +139,9 @@
139 139 debug_percpu_counter_deactivate(fbc);
140 140  
141 141 #ifdef CONFIG_HOTPLUG_CPU
142   - mutex_lock(&percpu_counters_lock);
  142 + spin_lock(&percpu_counters_lock);
143 143 list_del(&fbc->list);
144   - mutex_unlock(&percpu_counters_lock);
  144 + spin_unlock(&percpu_counters_lock);
145 145 #endif
146 146 free_percpu(fbc->counters);
147 147 fbc->counters = NULL;
... ... @@ -170,7 +170,7 @@
170 170 return NOTIFY_OK;
171 171  
172 172 cpu = (unsigned long)hcpu;
173   - mutex_lock(&percpu_counters_lock);
  173 + spin_lock(&percpu_counters_lock);
174 174 list_for_each_entry(fbc, &percpu_counters, list) {
175 175 s32 *pcount;
176 176 unsigned long flags;
... ... @@ -181,7 +181,7 @@
181 181 *pcount = 0;
182 182 raw_spin_unlock_irqrestore(&fbc->lock, flags);
183 183 }
184   - mutex_unlock(&percpu_counters_lock);
  184 + spin_unlock(&percpu_counters_lock);
185 185 #endif
186 186 return NOTIFY_OK;
187 187 }