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powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary

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[ Upstream commit c8eebc4a99 ]

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: cf387d9644 ("libnvdimm/altmap: Track namespace boundaries in altmap")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com <mailto:sachinp@linux.ibm.com>>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230616110826.344417-6-aneesh.kumar@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aneesh Kumar K.V
2023-06-16 16:38:15 +05:30
committed by Greg Kroah-Hartman
parent ea356080c1
commit 4e6c406ccb
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/mm/init_64.c
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@@ -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 nr_pfn = page_size / sizeof(struct page);
unsigned long start_pfn = page_to_pfn((struct page *)start); 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; return true;
if (start_pfn < altmap->base_pfn) if (start_pfn < altmap->base_pfn)