linux-kernel - Re: [PATCH v11 6/6] virtio-balloon: VIRTIO_BALLOON_F_CMD

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Date:   Mon, 12 Jun 2017 07:07:15 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Wei Wang <wei.w.wang@...el.com>, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, david@...hat.com,
        cornelia.huck@...ibm.com, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com
Subject: Re: [PATCH v11 6/6] virtio-balloon: VIRTIO_BALLOON_F_CMD_VQ

On 06/09/2017 03:41 AM, Wei Wang wrote:
> +	for_each_populated_zone(zone) {
> +		for (order = MAX_ORDER - 1; order > 0; order--) {
> +			for (migratetype = 0; migratetype < MIGRATE_TYPES;
> +			     migratetype++) {
> +				do {
> +					ret = report_unused_page_block(zone,
> +						order, migratetype, &page);
> +					if (!ret) {
> +						pfn = (u64)page_to_pfn(page);
> +						add_one_chunk(vb, vq,
> +						PAGE_CHNUK_UNUSED_PAGE,
> +						pfn << VIRTIO_BALLOON_PFN_SHIFT,
> +						(u64)(1 << order) *
> +						VIRTIO_BALLOON_PAGES_PER_PAGE);
> +					}
> +				} while (!ret);
> +			}
> +		}
> +	}

This is pretty unreadable.    Please add some indentation.  If you go
over 80 cols, then you might need to break this up into a separate
function.  But, either way, it can't be left like this.