Patch "powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-mm-dax-fix-the-condition-when-checking-if-al.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 90ee0d92192c1f49b6949c2bb419a14f084acc69
Author: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Date:   Fri Jun 16 16:38:15 2023 +0530

    powerpc/mm/dax: Fix the condition when checking if altmap vmemap can cross-boundary
    
    [ Upstream commit c8eebc4a99f15280654f23e914e746c40a516e50 ]
    
    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.kumar@xxxxxxxxxxxxx>
    Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxx <mailto:sachinp@xxxxxxxxxxxxx>>
    Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
    Link: https://msgid.link/20230616110826.344417-6-aneesh.kumar@xxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 210f1c28b8e41..e4fb5ab41e2d3 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -178,7 +178,7 @@ 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)



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