tcp: use alloc_large_system_hash() to allocate table_perturb

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@bytedance.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220607070214.94443-1-songmuchun@bytedance.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index e8de5e6..545f91b 100644 (file)
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -1026,10 +1026,12 @@ 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)