linux-kernel - [PATCH 3/6] powerpc: Add device-tree model to dump stack arch description

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Date:	Tue,  5 May 2015 21:12:14 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	<linuxppc-dev@...abs.org>
Cc:	<linux-kernel@...r.kernel.org>, Anton Blanchard <anton@...ba.org>,
	tj@...nel.org, Andrew Morton <akpm@...l.org>
Subject: [PATCH 3/6] powerpc: Add device-tree model to dump stack arch description

As soon as we know the model of the machine we're on, add it to the dump
stack arch description, which is printed in case of an oops.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/kernel/prom.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 308c5e15676b..a8ac55f7bd7b 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -34,6 +34,7 @@
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
+#include <linux/printk.h>
 
 #include <asm/prom.h>
 #include <asm/rtas.h>
@@ -642,6 +643,23 @@ static void __init early_reserve_mem(void)
 #endif
 }
 
+static int __init
+early_init_dt_scan_model(unsigned long node, const char *uname,
+			 int depth, void *data)
+{
+	const char *prop;
+
+	if (depth != 0)
+		return 0;
+
+	prop = of_get_flat_dt_prop(node, "model", NULL);
+	if (prop)
+		dump_stack_add_arch_desc(prop);
+
+	/* break now */
+	return 1;
+}
+
 void __init early_init_devtree(void *params)
 {
 	phys_addr_t limit;
@@ -652,6 +670,8 @@ void __init early_init_devtree(void *params)
 	if (!early_init_dt_verify(params))
 		panic("BUG: Failed verifying flat device tree, bad version?");
 
+	of_scan_flat_dt(early_init_dt_scan_model, NULL);
+
 #ifdef CONFIG_PPC_RTAS
 	/* Some machines might need RTAS info for debugging, grab it now. */
 	of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
-- 
2.1.0

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