From: Aneesh Kumar K.V Date: Fri, 16 Jun 2023 11:08:15 +0000 (+0530) Subject: powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c8eebc4a99f15280654f23e914e746c40a516e50;p=linux.git powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary 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 Tested-by: Sachin Sant > Signed-off-by: Michael Ellerman Link: https://msgid.link/20230616110826.344417-6-aneesh.kumar@linux.ibm.com --- diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 05b0d584e50b8..fe1b83020e0df 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)