Commit 0d6da872 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky

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

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: ebde765c ("s390/mm: uninline ptep_xxx functions from pgtable.h")
Cc: stable@vger.kernel.org # v4.6+
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 9dce990d
...@@ -202,7 +202,7 @@ static inline pgste_t ptep_xchg_start(struct mm_struct *mm, ...@@ -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, ...@@ -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, ...@@ -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, ...@@ -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;
} }
......
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