printk:add console_suspend module parameter
PATCH v2 1/1 printk:add console_suspend module parameter
We are enabling some power features on medfield. To test suspend-2-RAM conveniently, we need turn on/off console_suspend_enabled frequently.
Below patch adds a module parameter, so users could change it by:/sys/module/printk/parameters/console_suspend
Signed-off-by Yanmin Zhang <[email protected]>
---
Documentation/kernel-parameters.txt | 5 +++++ kernel/printk.c | 4 ++++ 2 files changed, 9 insertions(+), 0 deletions(-)
Documentation/kernel-parameters.txt +5 -0
@@ -1642,6 +1642,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. debugging driver suspend/resume hooks). This may not work reliably with all consoles, but is known to work with serial and VGA consoles. + To facilitate more flexible debugging, we also add + console_suspend, a printk module parameter to control + it. Users could use console_suspend (usually + /sys/module/printk/parameters/console_suspend) to + turn on/off it dynamically. noaliencache [MM, NUMA, SLAB] Disables the allocation of alien caches in the slab allocator. Saves per-node memory,
kernel/printk.c +4 -0
@@ -1108,6 +1108,10 @@ static int __init console_suspend_disable(char *str)return 1 ; }__setup ("no_console_suspend" , console_suspend_disable); +module_param_named (console_suspend, console_suspend_enabled, + bool,S_IRUGO |S_IWUSR ); +MODULE_PARM_DESC (console_suspend,"suspend console during suspend" +" and hibernate operations" );/** * suspend_console - suspend the console subsystem
Signature · 1 line
1.7.1