linux-kernel - Re: [PATCH v2 1/2] kexec: add dtb info to struct kimage

Open Source and information security mailing list archives

Date:	Thu, 18 Aug 2016 16:23:39 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Cc:	kexec@...ts.infradead.org,
	Stewart Smith <stewart@...ux.vnet.ibm.com>,
	Mark Rutland <mark.rutland@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>, Baoquan He <bhe@...hat.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	David Laight <David.Laight@...LAB.COM>,
	Eric Biederman <ebiederm@...ssion.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Russell King - ARM Linux <linux@...linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] kexec: add dtb info to struct kimage

On 08/11/16 at 08:03pm, Thiago Jung Bauermann wrote:
> From: AKASHI Takahiro <takahiro.akashi@...aro.org>
> 
> Device tree blob must be passed to a second kernel on DTB-capable
> archs, like powerpc and arm64, but the current kernel interface
> lacks this support.
> 
> This patch adds dtb buffer information to struct kimage.
> When users don't specify dtb explicitly and the one used for the current
> kernel can be re-used, this change will be good enough for implementing
> kexec_file_load feature.
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> ---
>  include/linux/kexec.h | 3 +++
>  kernel/kexec_file.c   | 3 +++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index d7437777baaa..4f85d284ed0b 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -192,6 +192,9 @@ struct kimage {
>  	char *cmdline_buf;
>  	unsigned long cmdline_buf_len;
>  
> +	void *dtb_buf;
> +	unsigned long dtb_buf_len;
> +
>  	/* File operations provided by image loader */
>  	struct kexec_file_ops *fops;
>  
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index 503bc2d348e5..113af2f219b9 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -92,6 +92,9 @@ void kimage_file_post_load_cleanup(struct kimage *image)
>  	vfree(image->initrd_buf);
>  	image->initrd_buf = NULL;
>  
> +	vfree(image->dtb_buf);
> +	image->dtb_buf = NULL;
> +
>  	kfree(image->cmdline_buf);
>  	image->cmdline_buf = NULL;
>  
> -- 
> 1.9.1
> 
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec

Acked-by: Dave Young <dyoung@...hat.com>

Thanks
Dave

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