Re: [PATCH] ARM: tegra: make tegra_cpu_reset_handler_enable() __init

[Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>]

On 07/18/2012 09:01 AM, Peter De Schrijver wrote:
> On Mon, Jun 18, 2012 at 11:01:50PM +0200, Stephen Warren wrote:
>> From: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>
>> This solves a section mismatch warning. I hadn't noticed this before,
>> because my compiler was inlining tegra_cpu_reset_handler_enable() inside
>> tegra_cpu_reset_handler_init(), which is already __init, but I switched
>> compilers and it stopped doing that.
> 
> Why does this generate a section mismatch warning? I see why calling a
> a __init marked function from a non __init marked function is a problem, but
> the opposite should be ok no?

The issue is that tegra_cpu_reset_handler_enable() itself (which was not
__init but the patch made to be __init) was referencing variable
__tegra_cpu_reset_handler_{start,end}. This wasn't noticed before
because when tegra_cpu_reset_handler_enable() was inlined into
tegra_cpu_reset_handler_init(), tegra_cpu_reset_handler_enable() was
effectively __init. However, when built as a separate function, you
ended up with a non-__init function referencing other things that were
__init.

In other words, this is indeed nothing to do with __init function
tegra_cpu_reset_handler_init() calling non-__init function
tegra_cpu_reset_handler_enable().

You can get the details by reverting the patch and building:-)