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virtio-mem: more precise calculation in virtio_mem_mb_state_prepare_next_mb()
We actually need one byte less (next_mb_id is exclusive, first_mb_id is inclusive). While at it, compact the code. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/20201112133815.13332-3-david@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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1 changed files with 2 additions and 4 deletions
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@ -257,10 +257,8 @@ static enum virtio_mem_mb_state virtio_mem_mb_get_state(struct virtio_mem *vm,
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*/
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static int virtio_mem_mb_state_prepare_next_mb(struct virtio_mem *vm)
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{
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unsigned long old_bytes = vm->next_mb_id - vm->first_mb_id + 1;
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unsigned long new_bytes = vm->next_mb_id - vm->first_mb_id + 2;
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int old_pages = PFN_UP(old_bytes);
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int new_pages = PFN_UP(new_bytes);
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int old_pages = PFN_UP(vm->next_mb_id - vm->first_mb_id);
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int new_pages = PFN_UP(vm->next_mb_id - vm->first_mb_id + 1);
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uint8_t *new_mb_state;
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if (vm->mb_state && old_pages == new_pages)
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