linux-kernel - Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory mapping is specified by user [v2]

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Date:	Fri, 10 Jan 2014 16:12:04 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linn Crosetto <linn@...com>, Pekka Enberg <penberg@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Toshi Kani <toshi.kani@...com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>, kosaki.motohiro@...il.com,
	dyoung@...hat.com, linux-acpi@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory
 mapping is specified by user [v2]

On Fri, Jan 10, 2014 at 02:04:58PM -0500, Prarit Bhargava wrote:

> kdump uses memmap=exactmap and mem=X values

Minor nit. Kdump only uses memmap=exactmap and not mem=X. mem=X is there
for debugging. So lets fix the changelog.

[..]
>  static int __init parse_memmap_opt(char *str)
>  {
> +	int ret;
> +
>  	while (str) {
>  		char *k = strchr(str, ',');
>  
>  		if (k)
>  			*k++ = 0;
>  
> -		parse_memmap_one(str);
> +		ret = parse_memmap_one(str);
> +		if (!ret)
> +			set_acpi_no_memhotplug();

We want to call this only in case of memmap=exactmap and not other memmap=
options. So I think instead of here, call it inside parse_memmap_one()
where exactmap check is done.

        if (!strncmp(p, "exactmap", 8)) {
		set_acpi_no_memhotplug();
	}

Thanks
Vivek
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