linux-kernel - [PATCH net-next v5 5/8] netconsole: Include sysdata in extradata entry count

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Message-Id: <20250206-netcon_cpu-v5-5-859b23cc3826@debian.org>
Date: Thu, 06 Feb 2025 03:05:56 -0800
From: Breno Leitao <leitao@...ian.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 rdunlap@...radead.org, Breno Leitao <leitao@...ian.org>, 
 kernel-team@...a.com
Subject: [PATCH net-next v5 5/8] netconsole: Include sysdata in extradata
 entry count

Modify count_extradata_entries() to include sysdata fields when
calculating the total number of extradata entries. This change ensures
that the sysdata feature, specifically the CPU number field, is
correctly counted against the MAX_EXTRADATA_ITEMS limit.

The modification adds a simple check for the CPU_NR flag in the
sysdata_fields, incrementing the entry count accordingly.

Signed-off-by: Breno Leitao <leitao@...ian.org>
Reviewed-by: Simon Horman <horms@...nel.org>
---
 drivers/net/netconsole.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 710330ae8ee462083dbb4aa889cb0ba0cb5a7475..50739c7dbfb6ad5b1a65ef33325cf4dd6ed02031 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -694,7 +694,15 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf,
  */
 static size_t count_extradata_entries(struct netconsole_target *nt)
 {
-	return list_count_nodes(&nt->userdata_group.cg_children);
+	size_t entries;
+
+	/* Userdata entries */
+	entries = list_count_nodes(&nt->userdata_group.cg_children);
+	/* Plus sysdata entries */
+	if (nt->sysdata_fields & CPU_NR)
+		entries += 1;
+
+	return entries;
 }

 static ssize_t remote_mac_store(struct config_item *item, const char *buf,

-- 
2.43.5