Where is the declaration of buffer used in kernel_param_ops .get functions?

[Matthew Wilcox]

On Sat, Oct 03, 2020 at 06:19:18PM -0700, Joe Perches wrote:
> These patches came up because I was looking for
> the location of the declaration of the buffer used
> in kernel/params.c struct kernel_param_ops .get
> functions.
> 
> I didn't find it.
> 
> I want to see if it's appropriate to convert the
> sprintf family of functions used in these .get
> functions to sysfs_emit.
> 
> Patches submitted here:
> https://lore.kernel.org/lkml/5d606519698ce4c8f1203a2b35797d8254c6050a.1600285923.git.joe@perches.com/T/
> 
> Anyone know if it's appropriate to change the
> sprintf-like uses in these functions to sysfs_emit
> and/or sysfs_emit_at?

There's a lot of preprocessor magic to wade through.

I'm pretty sure this comes through include/linux/moduleparam.h
and kernel/module.c.