powerpc: Convert context_lock to raw_spinlock

context_lock needs to be a real spinlock in RT. Convert it to
raw_spinlock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 1044a634b6d0a475d5978aecc8c37115f8c49abd..dbc692145ecb1aea313fc64992010519c73f1c28 100644 (file)
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -56,7 +56,7 @@ static unsigned int next_context, nr_free_contexts;
 static unsigned long *context_map;
 static unsigned long *stale_map[NR_CPUS];
 static struct mm_struct **context_mm;
-static DEFINE_SPINLOCK(context_lock);
+static DEFINE_RAW_SPINLOCK(context_lock);
 
 #define CTX_MAP_SIZE   \
        (sizeof(unsigned long) * (last_context / BITS_PER_LONG + 1))
@@ -121,9 +121,9 @@ static unsigned int steal_context_smp(unsigned int id)
        /* This will happen if you have more CPUs than available contexts,
         * all we can do here is wait a bit and try again
         */
-       spin_unlock(&context_lock);
+       raw_spin_unlock(&context_lock);
        cpu_relax();
-       spin_lock(&context_lock);
+       raw_spin_lock(&context_lock);
 
        /* This will cause the caller to try again */
        return MMU_NO_CONTEXT;
@@ -194,7 +194,7 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
        unsigned long *map;
 
        /* No lockless fast path .. yet */
-       spin_lock(&context_lock);
+       raw_spin_lock(&context_lock);
 
        pr_hard("[%d] activating context for mm @%p, active=%d, id=%d",
                cpu, next, next->context.active, next->context.id);
@@ -278,7 +278,7 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
        /* Flick the MMU and release lock */
        pr_hardcont(" -> %d\n", id);
        set_context(id, next->pgd);
-       spin_unlock(&context_lock);
+       raw_spin_unlock(&context_lock);
 }
 
 /*
@@ -307,7 +307,7 @@ void destroy_context(struct mm_struct *mm)
 
        WARN_ON(mm->context.active != 0);
 
-       spin_lock_irqsave(&context_lock, flags);
+       raw_spin_lock_irqsave(&context_lock, flags);
        id = mm->context.id;
        if (id != MMU_NO_CONTEXT) {
                __clear_bit(id, context_map);
@@ -318,7 +318,7 @@ void destroy_context(struct mm_struct *mm)
                context_mm[id] = NULL;
                nr_free_contexts++;
        }
-       spin_unlock_irqrestore(&context_lock, flags);
+       raw_spin_unlock_irqrestore(&context_lock, flags);
 }
 
 #ifdef CONFIG_SMP