[PATCH 4.9 104/104] s390/mm: make pmdp_invalidate() do invalidation only

From: Greg Kroah-Hartman
Date: Fri Oct 06 2017 - 04:56:48 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>

commit 91c575b335766effa6103eba42a82aea560c365f upstream.

Commit 227be799c39a ("s390/mm: uninline pmdp_xxx functions from pgtable.h")
inadvertently changed the behavior of pmdp_invalidate(), so that it now
clears the pmd instead of just marking it as invalid. Fix this by restoring
the original behavior.

A possible impact of the misbehaving pmdp_invalidate() would be the
MADV_DONTNEED races (see commits ced10803 and 58ceeb6b), although we
should not have any negative impact on the related dirty/young flags,
since those flags are not set by the hardware on s390.

Fixes: 227be799c39a ("s390/mm: uninline pmdp_xxx functions from pgtable.h")
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
arch/s390/include/asm/pgtable.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1359,7 +1359,9 @@ static inline pmd_t pmdp_huge_clear_flus
static inline void pmdp_invalidate(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
- pmdp_xchg_direct(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
+ pmd_t pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID);
+ pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd);