Commit 135b881e authored by Daniel Bristot de Oliveira's avatar Daniel Bristot de Oliveira Committed by Steven Rostedt (Google)
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rv/reactor: Add the printk reactor 

A reactor that printks the reaction message.

Link: https://lkml.kernel.org/r/b65f18a7fd6dc6659a3008fd7b7392de3465d47b.1659052063.git.bristot@kernel.org



Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: default avatarDaniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent ccc319dc

kernel/trace/rv/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -60,3 +60,11 @@ config RV_REACTORS 
	  on the model's execution. By default, the monitors have

	  tracing reactions, printing the monitor output via tracepoints,

	  but other reactions can be added (on-demand) via this interface.



config RV_REACT_PRINTK

	bool "Printk reactor"

	depends on RV_REACTORS

	default y

	help

	  Enables the printk reactor. The printk reactor emits a printk()

	  message if an exception is found.

kernel/trace/rv/Makefile

+2 −1
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0



obj-$(CONFIG_RV) += rv.o

obj-$(CONFIG_RV_REACTORS) += rv_reactors.o

obj-$(CONFIG_RV_MON_WIP) += monitors/wip/wip.o

obj-$(CONFIG_RV_MON_WWNR) += monitors/wwnr/wwnr.o

obj-$(CONFIG_RV_REACTORS) += rv_reactors.o

obj-$(CONFIG_RV_REACT_PRINTK) += reactor_printk.o

kernel/trace/rv/reactor_printk.c

0 → 100644
+42 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>

 *

 * Printk RV reactor:

 *   Prints the exception msg to the kernel message log.

 */

#include <linux/ftrace.h>

#include <linux/tracepoint.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/rv.h>



static void rv_printk_reaction(char *msg)

{

	printk_deferred(msg);

}



static struct rv_reactor rv_printk = {

	.name = "printk",

	.description = "prints the exception msg to the kernel message log.",

	.react = rv_printk_reaction

};



static int register_react_printk(void)

{

	rv_register_reactor(&rv_printk);

	return 0;

}



static void unregister_react_printk(void)

{

	rv_unregister_reactor(&rv_printk);

}



module_init(register_react_printk);

module_exit(unregister_react_printk);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Daniel Bristot de Oliveira");

MODULE_DESCRIPTION("printk rv reactor: printk if an exception is hit.");