linux-kernel - Re: [PATCH v2] x86/platform/uv: UV support for sub-NUMA clustering

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Date:   Wed, 25 Jan 2023 12:28:07 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Steve Wahl <steve.wahl@....com>
Cc:     Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/platform/uv: UV support for sub-NUMA clustering


* Steve Wahl <steve.wahl@....com> wrote:

> +static int __init alloc_conv_table(int num_elem, unsigned short **table)
> +{
> +	int i;
> +	size_t bytes;
> +
> +	bytes = num_elem * sizeof(*table[0]);
> +	*table = kmalloc(bytes, GFP_KERNEL);
> +	WARN_ON_ONCE(!*table);
> +	if (!*table)
> +		return -ENOMEM;

WARN_ON_ONCE() is pass-through on the condition, so you can write this in a 
shorter form:

	if (!WARN_ON_ONCE(!*table))
		return -ENOMEM;

> +	uv_hub_info_list_blade = kzalloc(bytes, GFP_KERNEL);
> +	WARN_ON_ONCE(!uv_hub_info_list_blade);
> +	if (!uv_hub_info_list_blade)
> +		return;

Ditto.

> +		WARN_ON_ONCE(!new_hub);
> +		if (!new_hub)
> +			return;

Same. Also a memory leak of at least uv_hub_info_list_blade?

> +	WARN_ON_ONCE(!__uv_hub_info_list);
> +	if (!__uv_hub_info_list)
> +		return;

Same.

> +
> +	for_each_node(nodeid) {
> +		__uv_hub_info_list[nodeid] = uv_hub_info_list_blade[uv_node_to_blade_id(nodeid)];
> +	}

Unnecessary curly braces.

Looks good otherwise - presumably it's both tested and backwards compatible 
with older UV hardware?

Thanks,

	Ingo