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s390/mm: Fix DirectMap accounting

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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: c98d2ecae0 ("s390/mm: Uncouple physical vs virtual address spaces")
Cc: stable@vger.kernel.org
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Carstens
2024-11-29 17:39:27 +01:00
committed by Greg Kroah-Hartman
parent f16eadc6fc
commit f7d75bc243
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/s390/boot/vmem.c
+3 -3
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@@ -306,7 +306,7 @@ static void pgtable_pte_populate(pmd_t *pmd, unsigned long addr, unsigned long e
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 *pud, unsigned long addr, unsigned long e
}
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 *p4d, unsigned long addr, unsigned long e
}
pgtable_pmd_populate(pud, addr, next, mode);
}
if (mode == POPULATE_DIRECT)
if (mode == POPULATE_IDENTITY)
update_page_count(PG_DIRECT_MAP_2G, pages);
}