From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by kanga.kvack.org (Postfix) with ESMTP id 1A7806B000A for ; Fri, 12 Oct 2018 12:10:11 -0400 (EDT) Received: by mail-qt1-f199.google.com with SMTP id r53-v6so12666584qtc.0 for ; Fri, 12 Oct 2018 09:10:11 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id m62-v6si1420341qkd.89.2018.10.12.09.10.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Oct 2018 09:10:10 -0700 (PDT) From: jglisse@redhat.com Subject: [PATCH] mm/thp: fix call to mmu_notifier in set_pmd_migration_entry() Date: Fri, 12 Oct 2018 12:09:53 -0400 Message-Id: <20181012160953.5841-1-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Greg Kroah-Hartman , Zi Yan , "Kirill A . Shutemov" , "H. Peter Anvin" , Anshuman Khandual , Dave Hansen , David Nellans , Ingo Molnar , Mel Gorman , Minchan Kim , Naoya Horiguchi , Thomas Gleixner , Vlastimil Babka , Michal Hocko , Andrea Arcangeli From: JA(C)rA'me Glisse Inside set_pmd_migration_entry() we are holding page table locks and thus we can not sleep so we can not call invalidate_range_start/end() So remove call to mmu_notifier_invalidate_range_start/end() and add call to mmu_notifier_invalidate_range(). Note that we are already calling mmu_notifier_invalidate_range_start/end() inside the function calling set_pmd_migration_entry() (see try_to_unmap_one()). Signed-off-by: JA(C)rA'me Glisse Reported-by: Andrea Arcangeli Cc: Andrew Morton Cc: Greg Kroah-Hartman Cc: Zi Yan Cc: Kirill A. Shutemov Cc: "H. Peter Anvin" Cc: Anshuman Khandual Cc: Dave Hansen Cc: David Nellans Cc: Ingo Molnar Cc: Mel Gorman Cc: Minchan Kim Cc: Naoya Horiguchi Cc: Thomas Gleixner Cc: Vlastimil Babka Cc: Michal Hocko Cc: Andrea Arcangeli --- mm/huge_memory.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 533f9b00147d..93cb80fe12cb 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2885,9 +2885,6 @@ void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, if (!(pvmw->pmd && !pvmw->pte)) return; - mmu_notifier_invalidate_range_start(mm, address, - address + HPAGE_PMD_SIZE); - flush_cache_range(vma, address, address + HPAGE_PMD_SIZE); pmdval = *pvmw->pmd; pmdp_invalidate(vma, address, pvmw->pmd); @@ -2898,11 +2895,9 @@ void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, if (pmd_soft_dirty(pmdval)) pmdswp = pmd_swp_mksoft_dirty(pmdswp); set_pmd_at(mm, address, pvmw->pmd, pmdswp); + mmu_notifier_invalidate_range(mm, address, address + HPAGE_PMD_SIZE); page_remove_rmap(page, true); put_page(page); - - mmu_notifier_invalidate_range_end(mm, address, - address + HPAGE_PMD_SIZE); } void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) -- 2.17.2