linux-kernel - [PATCH v1 07/12] mm/page_reporting: set page_reporting

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Message-Id: <20220922011252.2266780-8-zi.yan@sent.com>
Date:   Wed, 21 Sep 2022 21:12:47 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org
Cc:     Zi Yan <ziy@...dia.com>, David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Yang Shi <shy828301@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        James Houghton <jthoughton@...gle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 07/12] mm/page_reporting: set page_reporting_order to -1 to prevent it running

From: Zi Yan <ziy@...dia.com>

page_reporting_order was initialized to MAX_ORDER to prevent it running
before its value is overwritten. Use -1 instead to remove the
dependency on MAX_ORDER.

Signed-off-by: Zi Yan <ziy@...dia.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/page_reporting.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index d52a55bca6d5..e3d6f4af34e0 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -11,7 +11,11 @@
 #include "page_reporting.h"
 #include "internal.h"
 
-unsigned int page_reporting_order = MAX_ORDER + 1;
+/*
+ * Set page_reporting_order to (unsigned int)-1 to prevent it running until the
+ * value is being overwritten
+ */
+unsigned int page_reporting_order = (unsigned int)-1;
 module_param(page_reporting_order, uint, 0644);
 MODULE_PARM_DESC(page_reporting_order, "Set page reporting order");
 
-- 
2.35.1