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| author | Yanmin Zhang <yanmin_zhang@linux.intel.com> | 2011-10-31 17:11:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-31 17:30:53 -0700 |
| commit | 134620f7a865b3bc9e3d56d460603592b70ede21 (patch) | |
| tree | 82d455ffba5417b731d0283c6593e101dfb625ac | |
| parent | 0eca6b7c78fd997e02bd9850e608102382b7822e (diff) | |
| download | linux-134620f7a865b3bc9e3d56d460603592b70ede21.tar.bz2 | |
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.
Add a module parameter, so users could change it by:
/sys/module/printk/parameters/console_suspend
Signed-off-by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 | ||||
| -rw-r--r-- | kernel/printk.c | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 106efe1e2bab..c2efe285396c 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1669,6 +1669,11 @@ 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, diff --git a/kernel/printk.c b/kernel/printk.c index e62f949ec140..6d9dedd11450 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1111,6 +1111,10 @@ 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 |