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

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Date:	Thu, 11 Aug 2016 20:03:57 -0300
From:	Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
To:	kexec@...ts.infradead.org
Cc:	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Dave Young <dyoung@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>, Baoquan He <bhe@...hat.com>,
	David Laight <David.Laight@...LAB.COM>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Stewart Smith <stewart@...ux.vnet.ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Russell King - ARM Linux <linux@...linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 1/2] kexec: add dtb info to struct kimage

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