PC, KVM, CMA: Fix regression caused by wrong get_order() use

fc95ca7284bc54953165cba76c3228bd2cdb9591 claims that there is no
functional change but this is not true as it calls get_order() (which
takes bytes) where it should have called order_base_2() and the kernel
stops on VM_BUG_ON().

This replaces get_order() with order_base_2() (round-up version of ilog2).

Suggested-by: Paul Mackerras <paulus@samba.org>
Cc: Alexander Graf <agraf@suse.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 329d7fd..b9615ba 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -101,7 +101,7 @@ struct kvm_rma_info *kvm_alloc_rma()
        ri = kmalloc(sizeof(struct kvm_rma_info), GFP_KERNEL);
        if (!ri)
                return NULL;
-       page = cma_alloc(kvm_cma, kvm_rma_pages, get_order(kvm_rma_pages));
+       page = cma_alloc(kvm_cma, kvm_rma_pages, order_base_2(kvm_rma_pages));
        if (!page)
                goto err_out;
        atomic_set(&ri->use_count, 1);
@@ -135,12 +135,12 @@ struct page *kvm_alloc_hpt(unsigned long nr_pages)
 {
        unsigned long align_pages = HPT_ALIGN_PAGES;
 
-       VM_BUG_ON(get_order(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
+       VM_BUG_ON(order_base_2(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
 
        /* Old CPUs require HPT aligned on a multiple of its size */
        if (!cpu_has_feature(CPU_FTR_ARCH_206))
                align_pages = nr_pages;
-       return cma_alloc(kvm_cma, nr_pages, get_order(align_pages));
+       return cma_alloc(kvm_cma, nr_pages, order_base_2(align_pages));
 }
 EXPORT_SYMBOL_GPL(kvm_alloc_hpt);