From: Mike Rapoport <r...@linux.ibm.com>

The memory size calculation in kvm_cma_reserve() traverses memblock.memory
rather than simply call memblock_phys_mem_size(). The comment in that
function suggests that at some point there should have been call to
memblock_analyze() before memblock_phys_mem_size() could be used.
As of now, there is no memblock_analyze() at all and
memblock_phys_mem_size() can be used as soon as cold-plug memory is
registerd with memblock.

Replace loop over memblock.memory with a call to memblock_phys_mem_size().

Signed-off-by: Mike Rapoport <r...@linux.ibm.com>
---
 arch/powerpc/kvm/book3s_hv_builtin.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c 
b/arch/powerpc/kvm/book3s_hv_builtin.c
index 7cd3cf3d366b..56ab0d28de2a 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -95,22 +95,15 @@ EXPORT_SYMBOL_GPL(kvm_free_hpt_cma);
 void __init kvm_cma_reserve(void)
 {
        unsigned long align_size;
-       struct memblock_region *reg;
-       phys_addr_t selected_size = 0;
+       phys_addr_t selected_size;
 
        /*
         * We need CMA reservation only when we are in HV mode
         */
        if (!cpu_has_feature(CPU_FTR_HVMODE))
                return;
-       /*
-        * We cannot use memblock_phys_mem_size() here, because
-        * memblock_analyze() has not been called yet.
-        */
-       for_each_memblock(memory, reg)
-               selected_size += memblock_region_memory_end_pfn(reg) -
-                                memblock_region_memory_base_pfn(reg);
 
+       selected_size = PHYS_PFN(memblock_phys_mem_size());
        selected_size = (selected_size * kvm_cma_resv_ratio / 100) << 
PAGE_SHIFT;
        if (selected_size) {
                pr_debug("%s: reserving %ld MiB for global area\n", __func__,
-- 
2.26.2

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