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Date: Tue, 3 Oct 2017 14:29:13 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Gerald Schaefer <gerald.schaefer@...ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com> Subject: [PATCH 4.13 051/110] s390/mm: make pmdp_invalidate() do invalidation only 4.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gerald Schaefer <gerald.schaefer@...ibm.com> 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@...ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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 @@ -1462,7 +1462,9 @@ 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_EMPTY)); + pmd_t pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID); + + pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd); } #define __HAVE_ARCH_PMDP_SET_WRPROTECT
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