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powerpc/mm/altmap: Fix altmap boundary check
[ Upstream commit6722b25712
] altmap->free includes the entire free space from which altmap blocks can be allocated. So when checking whether the kernel is doing altmap block free, compute the boundary correctly, otherwise memory hotunplug can fail. Fixes:9ef34630a4
("powerpc/mm: Fallback to RAM if the altmap is unusable") Signed-off-by: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230724181320.471386-1-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 1 additions and 2 deletions
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@ -314,8 +314,7 @@ void __ref vmemmap_free(unsigned long start, unsigned long end,
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start = ALIGN_DOWN(start, page_size);
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if (altmap) {
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alt_start = altmap->base_pfn;
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alt_end = altmap->base_pfn + altmap->reserve +
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altmap->free + altmap->alloc + altmap->align;
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alt_end = altmap->base_pfn + altmap->reserve + altmap->free;
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}
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pr_debug("vmemmap_free %lx...%lx\n", start, end);
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