linux-kernel - [PATCH] char drivers: Ram oops kernel configuration parameters

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Message-Id: <1308854160-16022-1-git-send-email-sergiu@chromium.org>
Date:	Thu, 23 Jun 2011 11:36:00 -0700
From:	Sergiu Iordache <sergiu@...omium.org>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Samo Pogacnik <samo_pogacnik@....net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Sergiu Iordache <sergiu@...omium.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	"Ahmed S. Darwish" <darwish.07@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] char drivers: Ram oops kernel configuration parameters

Ramoops currently has module parameters for setting the configuration
variables (ram start, ram size and dump oopses). This makes it difficult to
configure when the module is compiled as a builtin.

This patch adds the following 3 configuration options which set the same
variables as the module parameters:
 1. RAMOOPS_RAM_START
 2. RAMOOPS_RAM_SIZE
 3. RAMOOPS_RAM_DUMP_OOPS

Module parameters take precedence over configuration parameters.

Signed-off-by: Sergiu Iordache <sergiu@...omium.org>
---
 drivers/char/Kconfig   |   36 ++++++++++++++++++++++++++++++++++++
 drivers/char/ramoops.c |    6 +++---
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 49502bc..0284f9f 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -608,6 +608,42 @@ config RAMOOPS
 	  This enables panic and oops messages to be logged to a circular
 	  buffer in RAM where it can be read back at some later point.
 
+config RAMOOPS_RAM_START
+	hex "Ramoops physical start address"
+	depends on RAMOOPS
+	default "0"
+	---help---
+	  Start address of the memory area that is used by Ramoops.
+
+	  For this feature to be useful, the selected memory area must be
+ 	  preserved across reboot, so not used by the boot loader, for example.
+
+	  Module parameter takes precedence over this.
+
+config RAMOOPS_RAM_SIZE
+	hex "Ramoops used RAM size"
+	depends on RAMOOPS
+	default "0"
+	---help---
+	  Size of the memory area that is used by Ramoops.
+
+	  For this feature to be useful, the selected memory area must be
+ 	  preserved across reboot, so not used by the boot loader, for example.
+
+	  Module parameter takes precedence over this.
+
+config RAMOOPS_DUMP_OOPS
+	int "Dump oopses or only panics"
+	depends on RAMOOPS
+	default "1"
+	help
+	  Flag to determine what gets dumped to RAM.
+
+	  If set to 1 then both oopses and panics are dumped to RAM.
+	  If set to 0 only kernel panics get dumped to RAM.
+
+	  Module parameter takes precedence over this.
+
 config MSM_SMD_PKT
 	bool "Enable device interface for some SMD packet ports"
 	default n
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 1a9f5f6..31b2c30 100644
--- a/drivers/char/ramoops.c
+++ b/drivers/char/ramoops.c
@@ -32,17 +32,17 @@
 
 #define RECORD_SIZE 4096UL
 
-static ulong mem_address;
+static ulong mem_address = CONFIG_RAMOOPS_RAM_START;
 module_param(mem_address, ulong, 0400);
 MODULE_PARM_DESC(mem_address,
 		"start of reserved RAM used to store oops/panic logs");
 
-static ulong mem_size;
+static ulong mem_size = CONFIG_RAMOOPS_RAM_SIZE;
 module_param(mem_size, ulong, 0400);
 MODULE_PARM_DESC(mem_size,
 		"size of reserved RAM used to store oops/panic logs");
 
-static int dump_oops = 1;
+static int dump_oops = CONFIG_RAMOOPS_DUMP_OOPS;
 module_param(dump_oops, int, 0600);
 MODULE_PARM_DESC(dump_oops,
 		"set to 1 to dump oopses, 0 to only dump panics (default 1)");
-- 
1.7.2.3

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