powerpc/mm/hash: Pull hash constants into hash__alloc_context_id()

The min and max context id values used in alloc_context_id() are
currently the right values for use on hash, and happen to also be safe
for use on radix.

But we need to change that in a subsequent patch, so make the min/max
ids parameters and pull the hash values into hsah__alloc_context_id().

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 650a498..981c3b0 100644 (file)
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -30,17 +30,16 @@
 static DEFINE_SPINLOCK(mmu_context_lock);
 static DEFINE_IDA(mmu_context_ida);
 
-static int __init_new_context(void)
+static int alloc_context_id(int min_id, int max_id)
 {
-       int index;
-       int err;
+       int index, err;
 
 again:
        if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL))
                return -ENOMEM;
 
        spin_lock(&mmu_context_lock);
-       err = ida_get_new_above(&mmu_context_ida, 1, &index);
+       err = ida_get_new_above(&mmu_context_ida, min_id, &index);
        spin_unlock(&mmu_context_lock);
 
        if (err == -EAGAIN)
@@ -48,7 +47,7 @@ again:
        else if (err)
                return err;
 
-       if (index > MAX_USER_CONTEXT) {
+       if (index > max_id) {
                spin_lock(&mmu_context_lock);
                ida_remove(&mmu_context_ida, index);
                spin_unlock(&mmu_context_lock);
@@ -60,7 +59,7 @@ again:
 
 int hash__alloc_context_id(void)
 {
-       return __init_new_context();
+       return alloc_context_id(1, MAX_USER_CONTEXT);
 }
 EXPORT_SYMBOL_GPL(hash__alloc_context_id);
 
@@ -80,7 +79,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
        int index;
 
-       index = __init_new_context();
+       index = hash__alloc_context_id();
        if (index < 0)
                return index;