[PATCH v6 07/19] powerpc/mm/hash: Abstract context id allocation for KVM

[Michael Ellerman]

KVM wants to be able to allocate an MMU context id, which it does
currently by calling __init_new_context().

We're about to rework that code, so provide a wrapper for KVM so it
can not worry about the details.

Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
---
 arch/powerpc/include/asm/mmu_context.h |  2 +-
 arch/powerpc/kvm/book3s_64_mmu_host.c  |  2 +-
 arch/powerpc/mm/mmu_context_book3s64.c | 10 ++++++++--
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/mmu_context.h 
b/arch/powerpc/include/asm/mmu_context.h
index b9e3f0aca261..7d721101ec78 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -51,7 +51,7 @@ static inline void switch_mmu_context(struct mm_struct *prev,
        return switch_slb(tsk, next);
 }
 
-extern int __init_new_context(void);
+extern int hash__alloc_context_id(void);
 extern void __destroy_context(int context_id);
 static inline void mmu_context_init(void) { }
 #else
diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c 
b/arch/powerpc/kvm/book3s_64_mmu_host.c
index a587e8f4fd26..b35f44c98d1f 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -390,7 +390,7 @@ int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
        struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
        int err;
 
-       err = __init_new_context();
+       err = hash__alloc_context_id();
        if (err < 0)
                return -1;
        vcpu3s->context_id[0] = err;
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c 
b/arch/powerpc/mm/mmu_context_book3s64.c
index 73bf6e14c3aa..650a498b1de9 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -30,7 +30,7 @@
 static DEFINE_SPINLOCK(mmu_context_lock);
 static DEFINE_IDA(mmu_context_ida);
 
-int __init_new_context(void)
+static int __init_new_context(void)
 {
        int index;
        int err;
@@ -57,7 +57,13 @@ int __init_new_context(void)
 
        return index;
 }
-EXPORT_SYMBOL_GPL(__init_new_context);
+
+int hash__alloc_context_id(void)
+{
+       return __init_new_context();
+}
+EXPORT_SYMBOL_GPL(hash__alloc_context_id);
+
 static int radix__init_new_context(struct mm_struct *mm, int index)
 {
        unsigned long rts_field;
-- 
2.7.4