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xen/balloon: Subtract from xen_released_pages the count that is populated.
We did not take into account that xen_released_pages would be used outside the initial E820 parsing code. As such we would did not subtract from xen_released_pages the count of pages that we had populated back (instead we just did a simple extra_pages = released - populated). The balloon driver uses xen_released_pages to set the initial current_pages count. If this is wrong (too low) then when a new (higher) target is set, the balloon driver will request too many pages from Xen." This fixes errors such as: (XEN) memory.c:133:d0 Could not allocate order=0 extent: id=0 memflags=0 (51 of 512) during bootup and free_memory : 0 where the free_memory should be 128. Acked-by: David Vrabel <david.vrabel@citrix.com> [v1: Per David's review made the git commit better] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -371,7 +371,8 @@ char * __init xen_memory_setup(void)
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populated = xen_populate_chunk(map, memmap.nr_entries,
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max_pfn, &last_pfn, xen_released_pages);
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extra_pages += (xen_released_pages - populated);
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xen_released_pages -= populated;
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extra_pages += xen_released_pages;
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if (last_pfn > max_pfn) {
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max_pfn = min(MAX_DOMAIN_PAGES, last_pfn);
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