From: Andrea Arcangeli <aarcange@redhat.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Hillf Danton <dhillf@gmail.com>, Dan Smith <danms@us.ibm.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        Paul Turner <pjt@google.com>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        Mike Galbraith <efault@gmx.de>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>,
        Bharata B Rao <bharata.rao@gmail.com>,
        Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
        Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
        Christoph Lameter <cl@linux.com>
Subject: [PATCH 24/35] autonuma: follow_page check for pte_numa/pmd_numa
Date: Fri, 25 May 2012 19:02:28 +0200
Message-Id: <1337965359-29725-25-git-send-email-aarcange@redhat.com>
In-Reply-To: <1337965359-29725-1-git-send-email-aarcange@redhat.com>
References: <1337965359-29725-1-git-send-email-aarcange@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1137
Lines: 34

Without this, follow_page wouldn't trigger the NUMA hinting faults.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
 mm/memory.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 7f265fc..e3aa47c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1483,7 +1483,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
 		goto no_page_table;
 
 	pmd = pmd_offset(pud, address);
-	if (pmd_none(*pmd))
+	if (pmd_none(*pmd) || pmd_numa(*pmd))
 		goto no_page_table;
 	if (pmd_huge(*pmd) && vma->vm_flags & VM_HUGETLB) {
 		BUG_ON(flags & FOLL_GET);
@@ -1517,7 +1517,7 @@ split_fallthrough:
 	ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
 
 	pte = *ptep;
-	if (!pte_present(pte))
+	if (!pte_present(pte) || pte_numa(pte))
 		goto no_page;
 	if ((flags & FOLL_WRITE) && !pte_write(pte))
 		goto unlock;
--
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