linux-kernel - [PATCH] ethernet: intel: fix building with large NR

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Message-Id: <20250620111141.3365031-1-arnd@kernel.org>
Date: Fri, 20 Jun 2025 13:11:17 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	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>
Cc: Arnd Bergmann <arnd@...db.de>,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	Simon Horman <horms@...nel.org>,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ethernet: intel: fix building with large NR_CPUS

From: Arnd Bergmann <arnd@...db.de>

With large values of CONFIG_NR_CPUS, three Intel ethernet drivers fail to
compile like:

In function ‘i40e_free_q_vector’,
    inlined from ‘i40e_vsi_alloc_q_vectors’ at drivers/net/ethernet/intel/i40e/i40e_main.c:12112:3:
  571 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
include/linux/rcupdate.h:1084:17: note: in expansion of macro ‘BUILD_BUG_ON’
 1084 |                 BUILD_BUG_ON(offsetof(typeof(*(ptr)), rhf) >= 4096);    \
drivers/net/ethernet/intel/i40e/i40e_main.c:5113:9: note: in expansion of macro ‘kfree_rcu’
 5113 |         kfree_rcu(q_vector, rcu);
      |         ^~~~~~~~~

The problem is that the 'rcu' member in 'q_vector' is too far from the start
of the structure. Move this member before the CPU mask instead, in all three
drivers.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/intel/fm10k/fm10k.h | 2 +-
 drivers/net/ethernet/intel/i40e/i40e.h   | 2 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h
index 6119a4108838..757a6fd81b7b 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k.h
@@ -187,6 +187,7 @@ struct fm10k_q_vector {
 	u32 __iomem *itr;	/* pointer to ITR register for this vector */
 	u16 v_idx;		/* index of q_vector within interface array */
 	struct fm10k_ring_container rx, tx;
+	struct rcu_head rcu;	/* to avoid race with update stats on free */
 
 	struct napi_struct napi;
 	cpumask_t affinity_mask;
@@ -195,7 +196,6 @@ struct fm10k_q_vector {
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dbg_q_vector;
 #endif /* CONFIG_DEBUG_FS */
-	struct rcu_head rcu;	/* to avoid race with update stats on free */
 
 	/* for dynamic allocation of rings associated with this q_vector */
 	struct fm10k_ring ring[] ____cacheline_internodealigned_in_smp;
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 54d5fdc303ca..91aa88366c05 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -944,6 +944,7 @@ struct i40e_q_vector {
 
 	u16 v_idx;		/* index in the vsi->q_vector array. */
 	u16 reg_idx;		/* register index of the interrupt */
+	struct rcu_head rcu;	/* to avoid race with update stats on free */
 
 	struct napi_struct napi;
 
@@ -956,7 +957,6 @@ struct i40e_q_vector {
 	cpumask_t affinity_mask;
 	struct irq_affinity_notify affinity_notify;
 
-	struct rcu_head rcu;	/* to avoid race with update stats on free */
 	char name[I40E_INT_NAME_STR_LEN];
 	bool arm_wb_state;
 	bool in_busy_poll;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index c6772cd2d802..c6cfab0ff9d3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -505,11 +505,11 @@ struct ixgbe_q_vector {
 				 * represents the vector for this ring */
 	u16 itr;		/* Interrupt throttle rate written to EITR */
 	struct ixgbe_ring_container rx, tx;
+	struct rcu_head rcu;	/* to avoid race with update stats on free */
 
 	struct napi_struct napi;
 	cpumask_t affinity_mask;
 	int numa_node;
-	struct rcu_head rcu;	/* to avoid race with update stats on free */
 	char name[IFNAMSIZ + 9];
 
 	/* for dynamic allocation of rings associated with this q_vector */
-- 
2.39.5