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s390/mm: Fix cmma unused transfer from pgste into pte

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commit 0d6da872d3 upstream.

The last pgtable rework silently disabled the CMMA unused state by
setting a local pte variable (a parameter) instead of propagating it
back into the caller. Fix it.

Fixes: ebde765c0e ("s390/mm: uninline ptep_xxx functions from pgtable.h")
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Borntraeger
2017-01-23 22:59:44 +01:00
committed by Greg Kroah-Hartman
parent 97a2e39b7a
commit 62d7f2123f
1 changed files with 4 additions and 3 deletions
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7
arch/s390/mm/pgtable.c
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@@ -202,7 +202,7 @@ static inline pgste_t ptep_xchg_start(struct mm_struct *mm,
return pgste; return pgste;
} }
static inline void ptep_xchg_commit(struct mm_struct *mm, static inline pte_t ptep_xchg_commit(struct mm_struct *mm,
unsigned long addr, pte_t *ptep, unsigned long addr, pte_t *ptep,
pgste_t pgste, pte_t old, pte_t new) pgste_t pgste, pte_t old, pte_t new)
{ {
@@ -220,6 +220,7 @@ static inline void ptep_xchg_commit(struct mm_struct *mm,
} else { } else {
*ptep = new; *ptep = new;
} }
return old;
} }
pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr, pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
@@ -231,7 +232,7 @@ pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
preempt_disable(); preempt_disable();
pgste = ptep_xchg_start(mm, addr, ptep); pgste = ptep_xchg_start(mm, addr, ptep);
old = ptep_flush_direct(mm, addr, ptep); old = ptep_flush_direct(mm, addr, ptep);
ptep_xchg_commit(mm, addr, ptep, pgste, old, new); old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
preempt_enable(); preempt_enable();
return old; return old;
} }
@@ -246,7 +247,7 @@ pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr,
preempt_disable(); preempt_disable();
pgste = ptep_xchg_start(mm, addr, ptep); pgste = ptep_xchg_start(mm, addr, ptep);
old = ptep_flush_lazy(mm, addr, ptep); old = ptep_flush_lazy(mm, addr, ptep);
ptep_xchg_commit(mm, addr, ptep, pgste, old, new); old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
preempt_enable(); preempt_enable();
return old; return old;
} }