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sparc64: Make itc_sync_lock raw 

One more place where we must not be able
to be preempted or to be interrupted in RT.

Always actually disable interrupts during
synchronization cycle.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2014-04-17 00:45:24 +04:00 committed by David S. Miller
parent aa3449ee9c
commit 49b6c01f4c
1 changed files with 3 additions and 3 deletions
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6
arch/sparc/kernel/smp_64.c
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@ -149,7 +149,7 @@ void cpu_panic(void)
#define NUM_ROUNDS 64 /* magic value */ #define NUM_ROUNDS 64 /* magic value */
#define NUM_ITERS 5 /* likewise */ #define NUM_ITERS 5 /* likewise */
static DEFINE_SPINLOCK(itc_sync_lock); static DEFINE_RAW_SPINLOCK(itc_sync_lock);
static unsigned long go[SLAVE + 1]; static unsigned long go[SLAVE + 1];
#define DEBUG_TICK_SYNC 0 #define DEBUG_TICK_SYNC 0
@ -257,7 +257,7 @@ static void smp_synchronize_one_tick(int cpu)
go[MASTER] = 0; go[MASTER] = 0;
membar_safe("#StoreLoad"); membar_safe("#StoreLoad");
spin_lock_irqsave(&itc_sync_lock, flags); raw_spin_lock_irqsave(&itc_sync_lock, flags);
{ {
for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) { for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
while (!go[MASTER]) while (!go[MASTER])
@ -268,7 +268,7 @@ static void smp_synchronize_one_tick(int cpu)
membar_safe("#StoreLoad"); membar_safe("#StoreLoad");
} }
} }
spin_unlock_irqrestore(&itc_sync_lock, flags); raw_spin_unlock_irqrestore(&itc_sync_lock, flags);
} }
#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU) #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)