Re: [RFC PATCH 1/3] init.h: Add __init_str / __exit_str macros

[Mathias Krause]

On 24 June 2014 21:43, Joe Perches <joe@xxxxxxxxxxx> wrote:
> On Mon, 2014-06-23 at 00:46 +0200, Mathias Krause wrote:
>> Add macros to be able to mark string literals used in __init / __exit
>> functions.
> []
>> diff --git a/include/linux/init.h b/include/linux/init.h
> []
>> +#define __init_str(str)      __mark_str(str, __UNIQUE_ID(_init_str_), __initconst)
>> +#define __exit_str(str)      __mark_str(str, __UNIQUE_ID(_exit_str_), __exitdata)
>> +#define __mark_str(str, var, __section) \
>> +     ({ static const char var[] __section __aligned(1) = str; var; })
>> +
>
> You probably want to make these strings vanish
> completely when !CONFIG_PRINTK.
>
> As is, they will always exist in the image.

They will not. They are vanished as printk() is an empty static inline
function for the !CONFIG_PRINTK case. gcc is clever enough to optimize
the variables away in this case.

Thanks,
Mathias
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