From: Heiko Carstens <hca@xxxxxxxxxxxxx>
commit 41856638e6c4ed51d8aa9e54f70059d1e357b46e upstream.
With uncoupling of physical and virtual address spaces population of
the identity mapping was changed to use the type POPULATE_IDENTITY
instead of POPULATE_DIRECT. This breaks DirectMap accounting:
> cat /proc/meminfo
DirectMap4k: 55296 kB
DirectMap1M: 18446744073709496320 kB
Adjust all locations of update_page_count() in vmem.c to use
POPULATE_IDENTITY instead of POPULATE_DIRECT as well. With this
accounting is correct again:
> cat /proc/meminfo
DirectMap4k: 54264 kB
DirectMap1M: 8334336 kB
Fixes: c98d2ecae08f ("s390/mm: Uncouple physical vs virtual address spaces")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/boot/vmem.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/s390/boot/vmem.c
+++ b/arch/s390/boot/vmem.c
@@ -306,7 +306,7 @@ static void pgtable_pte_populate(pmd_t *
pages++;
}
}
- if (mode == POPULATE_DIRECT)
+ if (mode == POPULATE_IDENTITY)
update_page_count(PG_DIRECT_MAP_4K, pages);
}
@@ -339,7 +339,7 @@ static void pgtable_pmd_populate(pud_t *
}
pgtable_pte_populate(pmd, addr, next, mode);
}
- if (mode == POPULATE_DIRECT)
+ if (mode == POPULATE_IDENTITY)
update_page_count(PG_DIRECT_MAP_1M, pages);
}
@@ -372,7 +372,7 @@ static void pgtable_pud_populate(p4d_t *
}
pgtable_pmd_populate(pud, addr, next, mode);
}
- if (mode == POPULATE_DIRECT)
+ if (mode == POPULATE_IDENTITY)
update_page_count(PG_DIRECT_MAP_2G, pages);
}
Patches currently in stable-queue which might be from hca@xxxxxxxxxxxxx are
queue-6.12/s390-ipl-fix-never-less-than-zero-warning.patch
queue-6.12/s390-mm-consider-kmsan-modules-metadata-for-paging-l.patch
queue-6.12/s390-mm-fix-directmap-accounting.patch
