linux-kernel - [PATCH 5.17 192/298] tcp: use alloc_large_system_hash() to allocate table

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Date:   Mon, 13 Jun 2022 12:11:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Muchun Song <songmuchun@...edance.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 192/298] tcp: use alloc_large_system_hash() to allocate table_perturb

From: Muchun Song <songmuchun@...edance.com>

[ Upstream commit e67b72b90b7e19a4be4d9c29f3feea6f58ab43f8 ]

In our server, there may be no high order (>= 6) memory since we reserve
lots of HugeTLB pages when booting.  Then the system panic.  So use
alloc_large_system_hash() to allocate table_perturb.

Fixes: e9261476184b ("tcp: dynamically allocate the perturb table used by source ports")
Signed-off-by: Muchun Song <songmuchun@...edance.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Link: https://lore.kernel.org/r/20220607070214.94443-1-songmuchun@bytedance.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv4/inet_hashtables.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index a5d57fa679ca..55654e335d43 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -917,10 +917,12 @@ void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
 	init_hashinfo_lhash2(h);
 
 	/* this one is used for source ports of outgoing connections */
-	table_perturb = kmalloc_array(INET_TABLE_PERTURB_SIZE,
-				      sizeof(*table_perturb), GFP_KERNEL);
-	if (!table_perturb)
-		panic("TCP: failed to alloc table_perturb");
+	table_perturb = alloc_large_system_hash("Table-perturb",
+						sizeof(*table_perturb),
+						INET_TABLE_PERTURB_SIZE,
+						0, 0, NULL, NULL,
+						INET_TABLE_PERTURB_SIZE,
+						INET_TABLE_PERTURB_SIZE);
 }
 
 int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
-- 
2.35.1