netdev - Re: [PATCH net] devlink: use kvzalloc() to allocate devlink instance resources

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Message-ID: <ZfwvR81dq4WN0XOG@nanopsycho>
Date: Thu, 21 Mar 2024 13:59:51 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Jian Wen <wenjianhn@...il.com>
Cc: edumazet@...gle.com, davem@...emloft.net,
	Jian Wen <wenjian1@...omi.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] devlink: use kvzalloc() to allocate devlink instance
 resources

Thu, Mar 21, 2024 at 01:36:11PM CET, wenjianhn@...il.com wrote:
>During live migration of a virtual machine, the SR-IOV VF need to be
>re-registered. It may fail when the memory is badly fragmented.
>
>The related log is as follows.
>
>Mar  1 18:54:12  kernel: hv_netvsc 6045bdaa-c0d1-6045-bdaa-c0d16045bdaa eth0: VF slot 1 added
>...
>Mar  1 18:54:13  kernel: kworker/0:0: page allocation failure: order:7, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
>Mar  1 18:54:13  kernel: CPU: 0 PID: 24006 Comm: kworker/0:0 Tainted: G            E     5.4...x86_64 #1
>Mar  1 18:54:13  kernel: Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090008  12/07/2018
>Mar  1 18:54:13  kernel: Workqueue: events work_for_cpu_fn
>Mar  1 18:54:13  kernel: Call Trace:
>Mar  1 18:54:13  kernel: dump_stack+0x8b/0xc8
>Mar  1 18:54:13  kernel: warn_alloc+0xff/0x170
>Mar  1 18:54:13  kernel: __alloc_pages_slowpath+0x92c/0xb2b
>Mar  1 18:54:13  kernel: ? get_page_from_freelist+0x1d4/0x1140
>Mar  1 18:54:13  kernel: __alloc_pages_nodemask+0x2f9/0x320
>Mar  1 18:54:13  kernel: alloc_pages_current+0x6a/0xb0
>Mar  1 18:54:13  kernel: kmalloc_order+0x1e/0x70
>Mar  1 18:54:13  kernel: kmalloc_order_trace+0x26/0xb0
>Mar  1 18:54:13  kernel: ? __switch_to_asm+0x34/0x70
>Mar  1 18:54:13  kernel: __kmalloc+0x276/0x280
>Mar  1 18:54:13  kernel: ? _raw_spin_unlock_irqrestore+0x1e/0x40
>Mar  1 18:54:13  kernel: devlink_alloc+0x29/0x110
>Mar  1 18:54:13  kernel: mlx5_devlink_alloc+0x1a/0x20 [mlx5_core]
>Mar  1 18:54:13  kernel: init_one+0x1d/0x650 [mlx5_core]
>Mar  1 18:54:13  kernel: local_pci_probe+0x46/0x90
>Mar  1 18:54:13  kernel: work_for_cpu_fn+0x1a/0x30
>Mar  1 18:54:13  kernel: process_one_work+0x16d/0x390
>Mar  1 18:54:13  kernel: worker_thread+0x1d3/0x3f0
>Mar  1 18:54:13  kernel: kthread+0x105/0x140
>Mar  1 18:54:13  kernel: ? max_active_store+0x80/0x80
>Mar  1 18:54:13  kernel: ? kthread_bind+0x20/0x20
>Mar  1 18:54:13  kernel: ret_from_fork+0x3a/0x50
>
>Signed-off-by: Jian Wen <wenjian1@...omi.com>

This is not fixing a bug introduced by specific commit, is it? Or is
this a regression? In that case, you need to add "Fixes" tag.
Idk, looks more like net-next material. The patch itself looks okay to
me.


>---
> net/devlink/core.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
>diff --git a/net/devlink/core.c b/net/devlink/core.c
>index 7f0b093208d7..ffbac42918d7 100644
>--- a/net/devlink/core.c
>+++ b/net/devlink/core.c
>@@ -314,7 +314,7 @@ static void devlink_release(struct work_struct *work)
> 	mutex_destroy(&devlink->lock);
> 	lockdep_unregister_key(&devlink->lock_key);
> 	put_device(devlink->dev);
>-	kfree(devlink);
>+	kvfree(devlink);
> }
> 
> void devlink_put(struct devlink *devlink)
>@@ -420,7 +420,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
> 	if (!devlink_reload_actions_valid(ops))
> 		return NULL;
> 
>-	devlink = kzalloc(sizeof(*devlink) + priv_size, GFP_KERNEL);
>+	devlink = kvzalloc(sizeof(*devlink) + priv_size, GFP_KERNEL);
> 	if (!devlink)
> 		return NULL;
> 
>@@ -455,7 +455,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
> 	return devlink;
> 
> err_xa_alloc:
>-	kfree(devlink);
>+	kvfree(devlink);
> 	return NULL;
> }
> EXPORT_SYMBOL_GPL(devlink_alloc_ns);
>-- 
>2.34.1
>
>