netdev - Re: [PATCH net-next 3/3] net/smc: optimize MTTE consumption for SMC-R buffers

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Message-ID: <aXOLR9GxwuNz3Ddc@infradead.org>
Date: Fri, 23 Jan 2026 06:52:55 -0800
From: Christoph Hellwig <hch@...radead.org>
To: "D. Wythe" <alibuda@...ux.alibaba.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dust Li <dust.li@...ux.alibaba.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Sidraya Jayagond <sidraya@...ux.ibm.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Wenjia Zhang <wenjia@...ux.ibm.com>,
	Mahanta Jambigi <mjambigi@...ux.ibm.com>,
	Simon Horman <horms@...nel.org>, Tony Lu <tonylu@...ux.alibaba.com>,
	Wen Gu <guwen@...ux.alibaba.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-rdma@...r.kernel.org,
	linux-s390@...r.kernel.org, netdev@...r.kernel.org,
	oliver.yang@...ux.alibaba.com
Subject: Re: [PATCH net-next 3/3] net/smc: optimize MTTE consumption for
 SMC-R buffers

On Fri, Jan 23, 2026 at 04:23:49PM +0800, D. Wythe wrote:
> +static inline int smc_buf_get_vm_page_order(struct smc_buf_desc *buf_slot)
> +{
> +#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
> +	struct vm_struct *vm;
> +
> +	vm = find_vm_area(buf_slot->cpu_addr);
> +	return vm ? vm->page_order : 0;
> +#else
> +	return 0;
> +#endif

You might want to encapsulate this logic in a vmalloc_order or similar
helper in vmalloc.c.