linux-kernel - Re: [PATCH v2 14/16] x86,nvdimm,kexec: Use walk_iomem_res

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Date:	Sun, 27 Dec 2015 00:05:22 +0800
From:	Minfei Huang <mhuang@...hat.com>
To:	Toshi Kani <toshi.kani@....com>
Cc:	akpm@...ux-foundation.org, bp@...en8.de,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	Dave Young <dyoung@...hat.com>, x86@...nel.org,
	linux-nvdimm@...1.01.org, kexec@...ts.infradead.org
Subject: Re: [PATCH v2 14/16] x86,nvdimm,kexec: Use walk_iomem_res_desc() for
 iomem search

Ccing kexec maillist.

On 12/25/15 at 03:09pm, Toshi Kani wrote:
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index c245085..e2bd737 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -522,10 +522,10 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
>  
>  	/* Walk the RAM ranges and allocate a suitable range for the buffer */
>  	if (image->type == KEXEC_TYPE_CRASH)
> -		ret = walk_iomem_res("Crash kernel",
> -				     IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
> -				     crashk_res.start, crashk_res.end, kbuf,
> -				     locate_mem_hole_callback);
> +		ret = walk_iomem_res_desc(IORES_DESC_CRASH_KERNEL,

Since crashk_res's desc has been assigned to IORES_DESC_CRASH_KERNEL, it
is better to use crashk_res.desc, instead of using
IORES_DESC_CRASH_KERNEL directly.

Thanks
Minfei

> +				IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
> +				crashk_res.start, crashk_res.end, kbuf,
> +				locate_mem_hole_callback);
>  	else
>  		ret = walk_system_ram_res(0, -1, kbuf,
>  					  locate_mem_hole_callback);
--
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