linux-kernel - [PATCH WIP v1 15/20] mm/rmap_id: verify precalculated subids with CONFIG_DEBUG

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Message-ID: <20231124132626.235350-16-david@redhat.com>
Date:   Fri, 24 Nov 2023 14:26:20 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ryan Roberts <ryan.roberts@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        Yin Fengwei <fengwei.yin@...el.com>,
        Yang Shi <shy828301@...il.com>,
        Ying Huang <ying.huang@...el.com>, Zi Yan <ziy@...dia.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH WIP v1 15/20] mm/rmap_id: verify precalculated subids with CONFIG_DEBUG_VM

Let's verify the precalculated subids for 4/5/6 values.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/rmap_id.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/mm/rmap_id.c b/mm/rmap_id.c
index 6c3187547741..421d8d2b646c 100644
--- a/mm/rmap_id.c
+++ b/mm/rmap_id.c
@@ -481,3 +481,29 @@ void free_rmap_id(int id)
 	ida_free(&rmap_ida, id);
 	spin_unlock(&rmap_id_lock);
 }
+
+#ifdef CONFIG_DEBUG_VM
+static int __init rmap_id_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(rmap_subids_4); i++)
+		WARN_ON_ONCE(calc_rmap_subid(1u << RMAP_SUBID_4_MAX_ORDER, i) !=
+			     rmap_subids_4[i]);
+
+#if MAX_ORDER >= RMAP_SUBID_5_MIN_ORDER
+	for (i = 0; i < ARRAY_SIZE(rmap_subids_5); i++)
+		WARN_ON_ONCE(calc_rmap_subid(1u << RMAP_SUBID_5_MAX_ORDER, i) !=
+			     rmap_subids_5[i]);
+#endif
+
+#if MAX_ORDER >= RMAP_SUBID_6_MIN_ORDER
+	for (i = 0; i < ARRAY_SIZE(rmap_subids_6); i++)
+		WARN_ON_ONCE(calc_rmap_subid(1u << RMAP_SUBID_6_MAX_ORDER, i) !=
+			     rmap_subids_6[i]);
+#endif
+
+	return 0;
+}
+module_init(rmap_id_init)
+#endif /* CONFIG_DEBUG_VM */
-- 
2.41.0