[PATCH 05/16] powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary

[Aneesh Kumar K.V]

Without this fix, the last subsection vmemmap can end up in memory even if the
namespace is created with -M mem and has sufficient space in the altmap area.

Fixes: cf387d9644d8 ("libnvdimm/altmap: Track namespace boundaries in altmap")
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
 arch/powerpc/mm/init_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 05b0d584e50b..fe1b83020e0d 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -189,7 +189,7 @@ static bool altmap_cross_boundary(struct vmem_altmap 
*altmap, unsigned long star
        unsigned long nr_pfn = page_size / sizeof(struct page);
        unsigned long start_pfn = page_to_pfn((struct page *)start);
 
-       if ((start_pfn + nr_pfn) > altmap->end_pfn)
+       if ((start_pfn + nr_pfn - 1) > altmap->end_pfn)
                return true;
 
        if (start_pfn < altmap->base_pfn)
-- 
2.40.1