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Bug#825026: linux-image-4.5.0-2-armmp-lpae: heartbeat triggered LEDs don't come up by default



On Sun, 2016-05-22 at 21:01 +0200, Steinar H. Gunderson wrote:
> On Sun, May 22, 2016 at 07:49:35PM +0100, Ben Hutchings wrote:
> > 
> > The device tree already tells the kernel what trigger should be used,
> > and the kernel can then make the decision whether that requires loading
> > a module.
> Does this mean the initramfs would also need to know that the module should
> be included? I assume the kernel cannot re-trigger modules when switching
> from initramfs to the real root.

If the module is loaded based on a device's uevent, rather than a
request_module() from the kernel, there is another chance to load it
when udev is restarted.  That's how most drivers get loaded!

> > 
> > I disagree; it doesn't make sense to build in every trigger that might
> > be needed.
> Why not? They are small, and some would be useful even before loading
> initramfs (although this would necessitate also having the PWM driver =y).

We build in code because we have to, not because it's merely useful.
And here we're talking about modules that are useful for only a small
proportion of armhf systems.

Ben.

-- 
Ben Hutchings
friends: People who know you well, but like you anyway.

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