linux-kernel - Re: [PATCH] crypto: aegis128 - fix link error without SIMD

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Date:   Fri, 4 Dec 2020 09:22:37 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ondrej Mosnacek <omosnacek@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Biggers <ebiggers@...gle.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: aegis128 - fix link error without SIMD

On Thu, 3 Dec 2020 at 23:26, Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> When the SIMD portion of the driver is disabled, the compiler cannot
> figure out in advance if it will be called:
>
> ERROR: modpost: "crypto_aegis128_update_simd" [crypto/aegis128.ko] undefined!
>
> Add a conditional to let the compiler use dead code elimination
> as before.
>
> Fixes: ac50aec41a9f ("crypto: aegis128 - expose SIMD code path as separate driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I already sent the exact same fix a couple of days ago, and Herbert
just merged it today.

> ---
>  crypto/aegis128-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/crypto/aegis128-core.c b/crypto/aegis128-core.c
> index 2b05f79475d3..89dc1c559689 100644
> --- a/crypto/aegis128-core.c
> +++ b/crypto/aegis128-core.c
> @@ -89,7 +89,7 @@ static void crypto_aegis128_update_a(struct aegis_state *state,
>                                      const union aegis_block *msg,
>                                      bool do_simd)
>  {
> -       if (do_simd) {
> +       if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
>                 crypto_aegis128_update_simd(state, msg);
>                 return;
>         }
> @@ -101,7 +101,7 @@ static void crypto_aegis128_update_a(struct aegis_state *state,
>  static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg,
>                                      bool do_simd)
>  {
> -       if (do_simd) {
> +       if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
>                 crypto_aegis128_update_simd(state, msg);
>                 return;
>         }
> --
> 2.27.0
>