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s390/kvm: bad rss-counter state

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commit c3f0327f8e
    mm: add rss counters consistency check
detected the following problem with kvm on s390:

BUG: Bad rss-counter state mm:00000004f73ef000 idx:0 val:-10
BUG: Bad rss-counter state mm:00000004f73ef000 idx:1 val:-5

We have to make sure that we accumulate all rss values into
the mm before we replace the mm to avoid triggering this (harmless)
bug message.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2012-05-09 16:27:38 +02:00 committed by Martin Schwidefsky
parent ae73c76ab7
commit 2739b6d124
1 changed files with 2 additions and 0 deletions
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2
arch/s390/mm/pgtable.c
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@ -822,6 +822,8 @@ int s390_enable_sie(void)
/* we copy the mm and let dup_mm create the page tables with_pgstes */
tsk->mm->context.alloc_pgste = 1;
/* make sure that both mms have a correct rss state */
sync_mm_rss(tsk->mm);
mm = dup_mm(tsk);
tsk->mm->context.alloc_pgste = 0;
if (!mm)