diff options
author | Christian Borntraeger <borntraeger@de.ibm.com> | 2008-10-28 11:10:15 +0100 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-10-28 11:12:03 +0100 |
commit | 250cf776f74b5932a1977d0489cae9206e2351dd (patch) | |
tree | 71bb6778e65e8efbdd0cac09a64e4e1194b98c3f /arch/ia64 | |
parent | 2c78091405d6f54748b1fac78c45f2a799e3073a (diff) |
[S390] pgtables: Fix race in enable_sie vs. page table ops
The current enable_sie code sets the mm->context.pgstes bit to tell
dup_mm that the new mm should have extended page tables. This bit is also
used by the s390 specific page table primitives to decide about the page
table layout - which means context.pgstes has two meanings. This can cause
any kind of bugs. For example - e.g. shrink_zone can call
ptep_clear_flush_young while enable_sie is running. ptep_clear_flush_young
will test for context.pgstes. Since enable_sie changed that value of the old
struct mm without changing the page table layout ptep_clear_flush_young will
do the wrong thing.
The solution is to split pgstes into two bits
- one for the allocation
- one for the current state
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/ia64')
0 files changed, 0 insertions, 0 deletions