linux-kernel - Re: [PATCH v4 5/5] x86: implement crashkernel cma reservation

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Message-ID: <aD7WLv86BOVS+GPm@MiWiFi-R3L-srv>
Date: Tue, 3 Jun 2025 19:02:06 +0800
From: Baoquan He <bhe@...hat.com>
To: Jiri Bohac <jbohac@...e.cz>
Cc: Vivek Goyal <vgoyal@...hat.com>, Dave Young <dyoung@...hat.com>,
	kexec@...ts.infradead.org, Philipp Rudo <prudo@...hat.com>,
	Donald Dutile <ddutile@...hat.com>, Pingfan Liu <piliu@...hat.com>,
	Tao Liu <ltao@...hat.com>, linux-kernel@...r.kernel.org,
	David Hildenbrand <dhildenb@...hat.com>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v4 5/5] x86: implement crashkernel cma reservation

On 05/30/25 at 10:31pm, Jiri Bohac wrote:
......snip.. 
> @@ -582,7 +582,7 @@ static void __init arch_reserve_crashkernel(void)
>  
>  	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
>  				&crash_size, &crash_base,
> -				&low_size, NULL, &high);
> +				&low_size, &cma_size, &high);
>  	if (ret)
>  		return;
>  
> @@ -592,6 +592,7 @@ static void __init arch_reserve_crashkernel(void)
>  	}
>  
>  	reserve_crashkernel_generic(crash_size, crash_base, low_size, high);
> +	reserve_crashkernel_cma(cma_size);

Wondering if ,high|low is still allowed (or needed) when ,cma is specified.