linux-kernel - Re: [PATCH v6] lib/crypto: blake2s: include as built-in

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Date:   Mon, 3 Jan 2022 14:23:34 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH v6] lib/crypto: blake2s: include as built-in

On Sun, Jan 02, 2022 at 09:42:03PM +0100, Jason A. Donenfeld wrote:
> In preparation for using blake2s in the RNG, we change the way that it
> is wired-in to the build system. Instead of using ifdefs to select the
> right symbol, we use weak symbols. And because ARM doesn't need the
> generic implementation, we make the generic one default only if an arch
> library doesn't need it already, and then have arch libraries that do
> need it opt-in.
> 
> Acked-by: Ard Biesheuvel <ardb@...nel.org>
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: linux-kbuild@...r.kernel.org
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: linux-crypto@...r.kernel.org
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> Herbert - As mentioned with the vPrev, I intend to take this via the
> crng/random.git tree, since it forms a dependency and I'd like to send a
> pull early in 5.17 cycle.

At this point I think we should push this through crypto.  The
changes are too invasive with respect to the crypto Kconfig files.

> diff --git a/crypto/Kconfig b/crypto/Kconfig
> index 285f82647d2b..b7a2e50dcbc8 100644
> --- a/crypto/Kconfig
> +++ b/crypto/Kconfig
> @@ -702,7 +702,7 @@ config CRYPTO_BLAKE2S
>  	  See https://blake2.net for further information.
>  
>  config CRYPTO_BLAKE2S_X86
> -	tristate "BLAKE2s digest algorithm (x86 accelerated version)"
> +	bool "BLAKE2s digest algorithm (x86 accelerated version)"
>  	depends on X86 && 64BIT
>  	select CRYPTO_LIB_BLAKE2S_GENERIC
>  	select CRYPTO_ARCH_HAVE_LIB_BLAKE2S

This will break when CRYPTO is disabled because the x86 crypto
glue code depends on the crypto subsystem.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt