linux-kernel - Re: [PATCH v3 2/5] lib: Add Sed-opal library

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Date:   Mon, 19 Dec 2016 16:34:15 -0500
From:   Keith Busch <keith.busch@...el.com>
To:     Scott Bauer <scott.bauer@...el.com>
Cc:     linux-nvme@...ts.infradead.org, Rafael.Antognolli@...el.com,
        axboe@...com, jonathan.derrick@...el.com, viro@...iv.linux.org.uk,
        hch@...radead.org, linux-kernel@...r.kernel.org, sagi@...mberg.me
Subject: Re: [PATCH v3 2/5] lib: Add Sed-opal library

On Mon, Dec 19, 2016 at 12:35:46PM -0700, Scott Bauer wrote:
> This patch implements the necessary logic to bring an Opal
> enabled drive out of a factory-enabled into a working
> Opal state.
> 
> This patch set also enables logic to save a password to
> be replayed during a resume from suspend.
> 
> Signed-off-by: Scott Bauer <scott.bauer@...el.com>
> Signed-off-by: Rafael Antognolli <Rafael.Antognolli@...el.com>
> ---
>  lib/Makefile            |    2 +-
>  lib/sed-opal.c          | 2376 +++++++++++++++++++++++++++++++++++++++++++++++
>  lib/sed-opal_internal.h |  601 ++++++++++++
>  lib/sed.c               |  197 ++++
>  4 files changed, 3175 insertions(+), 1 deletion(-)
>  create mode 100644 lib/sed-opal.c
>  create mode 100644 lib/sed-opal_internal.h
>  create mode 100644 lib/sed.c
> 
> diff --git a/lib/Makefile b/lib/Makefile
> index 50144a3..acb5d82 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -36,7 +36,7 @@ obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
>  	 gcd.o lcm.o list_sort.o uuid.o flex_array.o iov_iter.o clz_ctz.o \
>  	 bsearch.o find_bit.o llist.o memweight.o kfifo.o \
>  	 percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o \
> -	 once.o
> +	 once.o sed.o sed-opal.o

This seems like an optional library that some environments may wish to
opt-out of building into the kernel. Any reason not to add an entry into
the Kconfig to turn this on/off?