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authorChen Yu <yu.c.chen@intel.com>2020-04-02 15:56:52 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-04-02 15:29:56 +0200
commitdb96a75946d3a2a41092c83992e65f727cd35529 (patch)
tree78ed92834bbd1aea7e3d272af8d3cb44c50bf237 /kernel/power
parentb5252a6cbbdaefb2648abe8807beda8a28ec7603 (diff)
downloadlinux-db96a75946d3a2a41092c83992e65f727cd35529.tar.bz2
PM: sleep: Add pm_debug_messages kernel command line option
Debug messages from the system suspend/hibernation infrastructure are disabled by default, and can only be enabled after the system has boot up via /sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance for software_resume() to track the resume process, for example. Add a kernel command line option to set pm_debug_messages during boot up. Signed-off-by: Chen Yu <yu.c.chen@intel.com> [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/main.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 69b7a8aeca3b..40f86ec4ab30 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,
power_attr(pm_debug_messages);
+static int __init pm_debug_messages_setup(char *str)
+{
+ pm_debug_messages_on = true;
+ return 1;
+}
+__setup("pm_debug_messages", pm_debug_messages_setup);
+
/**
* __pm_pr_dbg - Print a suspend debug message to the kernel log.
* @defer: Whether or not to use printk_deferred() to print the message.