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

fc95ca7284 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>
This commit is contained in:
Alexey Kardashevskiy 2014-08-14 15:03:07 +10:00 committed by Paolo Bonzini
parent 350b8bdd68
commit c04fa5831d
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kvm/book3s_hv_builtin.c
View File

@ -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);