linux-kernel - Re: [PATCH] fs/crypto: make crypto.c explicitly non-modular

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Date:	Mon, 29 Feb 2016 10:56:50 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: [PATCH] fs/crypto: make crypto.c explicitly non-modular

On Saturday 27 February 2016 15:20:49 Paul Gortmaker wrote:
> As of commit 47134e6084f70fdf4381af75d4569cec6c7ebd50 ("fs crypto:
> add Makefile and Kconfig") the compile of fs/crypto/crypto.c tripped
> my local audit for non-modules using modular infrastructure vs. their
> built in counterparts.
> 
> The Kconfig currently controlling compilation of this code is:
> 
> config FS_ENCRYPTION
>         bool "FS Encryption (Per-file encryption)"
> 
> combined with:
> 
> obj-$(CONFIG_FS_ENCRYPTION)     += crypto.o policy.o keyinfo.o
> 
> ...meaning that it currently is not being built as a module by anyone.
> 
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> Since module_init translates to device_initcall in the non-modular
> case, the use of fs_initcall (which seems appropriate for fs code)
> means the init comes slightly earlier.  However boot testing an
> x86-64 defconfig didn't show this to be causing any issues.
> 
> We replace module.h with moduleparam.h since the file does declare
> some module parameters, and leaving them as such is currently the
> easiest way to remain compatible with existing boot arg use cases.
> 

So why not make the option a 'tristate' instead? It looks like
that was intended here, and we should always try to make all
code loadable as modules if possible.

	Arnd