linux-kernel - [PATCH 4.4 42/60] Fixes: Commit cdbf92675fad ("mm: numa: avoid waiting on freed migrated pages")

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Date:   Thu, 13 Sep 2018 15:30:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "natechancellor@...il.com, mark.rutland@....com, will.deacon@....com,
        steve.capper@....com, kirill.shutemov@...ux.intel.com, vbabka@...e.cz,
        mgorman@...e.de, Chas Williams" <chas3@....com>,
        Chas Williams <chas3@....com>
Subject: [PATCH 4.4 42/60] Fixes: Commit cdbf92675fad ("mm: numa: avoid waiting on freed migrated pages")

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

------------------


From: Chas Williams <chas3@....com>

Commit cdbf92675fad ("mm: numa: avoid waiting on freed migrated pages")
was an incomplete backport of the upstream commit.  It is necessary to
always reset page_nid before attempting any early exit.

The original commit conflicted due to lack of commit 82b0f8c39a38
("mm: join struct fault_env and vm_fault") in 4.9 so it wasn't a clean
application, and the change must have just gotten lost in the noise.

Signed-off-by: Chas Williams <chas3@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/huge_memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1393,12 +1393,12 @@ int do_huge_pmd_numa_page(struct mm_stru
 
 	/* Migration could have started since the pmd_trans_migrating check */
 	if (!page_locked) {
+		page_nid = -1;
 		if (!get_page_unless_zero(page))
 			goto out_unlock;
 		spin_unlock(ptl);
 		wait_on_page_locked(page);
 		put_page(page);
-		page_nid = -1;
 		goto out;
 	}