[PATCH] powerpc/mm/altmap: Fix altmap boundary check

[Aneesh Kumar K.V]

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.

Cc: David Hildenbrand <da...@redhat.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Fixes: 9ef34630a461 ("powerpc/mm: Fallback to RAM if the altmap is unusable")
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
 arch/powerpc/mm/init_64.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index fe1b83020e0d..0ec5b45b1e86 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -314,8 +314,7 @@ void __ref vmemmap_free(unsigned long start, unsigned long 
end,
        start = ALIGN_DOWN(start, page_size);
        if (altmap) {
                alt_start = altmap->base_pfn;
-               alt_end = altmap->base_pfn + altmap->reserve +
-                         altmap->free + altmap->alloc + altmap->align;
+               alt_end = altmap->base_pfn + altmap->reserve + altmap->free;
        }
 
        pr_debug("vmemmap_free %lx...%lx\n", start, end);
-- 
2.41.0