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Date: Wed, 10 Aug 2011 08:57:45 +0800 From: Yanmin Zhang <yanmin_zhang@...ux.intel.com> To: Dave Young <hidave.darkstar@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH ] printk: add module parameter console_suspend to control console_suspend_enabled On Tue, 2011-08-09 at 17:59 +0800, Dave Young wrote: > Hi, > > On Tue, Aug 9, 2011 at 4:55 PM, Yanmin Zhang > <yanmin_zhang@...ux.intel.com> wrote: > > On Tue, 2011-08-09 at 16:01 +0800, Dave Young wrote: > >> On Tue, Aug 9, 2011 at 11:09 AM, Yanmin Zhang > >> <yanmin_zhang@...ux.intel.com> wrote: > >> > 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_enabled > >> > >> What about change name to no_console_suspend? Or it will be weird if > >> boot kernel with both no_console_suspend and > >> printk.console_suspend_enabled set. > > Thanks for the comments. How about changing the name to console_suspend? > > If changing it to no_console_suspend, we can't map the input to console_suspend_enabled > > directly. > > How about use module_param_cb instead of module_param_named? Thanks for the pointer. Indeed, we could use module_param_cb to support the input/output parsing. Is it too complicated to use it here? It's better to keep simple. The new name console_suspend is clearer than old name. > > > > > Below is the new patch. > > > > --- > > > > 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 <yanmin_zhang@...ux.intel.com> > > > > --- > > kernel/printk.c | 2 ++ > > 1 files changed, 2 insertions(+), 0 deletions(-) > > > > diff --git a/kernel/printk.c b/kernel/printk.c > > index 37dff34..1decef6 100644 > > --- a/kernel/printk.c > > +++ b/kernel/printk.c > > @@ -1106,6 +1106,8 @@ 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); > > > > /** > > * suspend_console - suspend the console subsystem > > -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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