linux-kernel - Re: [PATCH v3 01/10] crypto: crypto_user_stat: made crypto_user

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Date:   Tue, 20 Nov 2018 09:13:29 -0500
From:   Neil Horman <nhorman@...driver.com>
To:     Corentin Labbe <clabbe@...libre.com>
Cc:     davem@...emloft.net, ebiggers@...nel.org,
        herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/10] crypto: crypto_user_stat: made crypto_user_stat
 optional

On Tue, Nov 20, 2018 at 12:32:17PM +0000, Corentin Labbe wrote:
> Even if CRYPTO_STATS is set to n, some part of CRYPTO_STATS are
> compiled.
> This patch made all part of crypto_user_stat uncompiled in that case.
> 
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
>  crypto/Makefile                      |  3 ++-
>  crypto/algapi.c                      |  2 ++
>  include/crypto/internal/cryptouser.h | 17 +++++++++++++++++
>  include/linux/crypto.h               |  2 ++
>  4 files changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/crypto/Makefile b/crypto/Makefile
> index abbd86fdbad2..22f9f84f961d 100644
> --- a/crypto/Makefile
> +++ b/crypto/Makefile
> @@ -54,7 +54,8 @@ cryptomgr-y := algboss.o testmgr.o
>  
>  obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o
>  obj-$(CONFIG_CRYPTO_USER) += crypto_user.o
> -crypto_user-y := crypto_user_base.o crypto_user_stat.o
> +crypto_user-y := crypto_user_base.o
> +crypto_user-$(CONFIG_CRYPTO_STATS) += crypto_user_stat.o
>  obj-$(CONFIG_CRYPTO_CMAC) += cmac.o
>  obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
>  obj-$(CONFIG_CRYPTO_VMAC) += vmac.o
> diff --git a/crypto/algapi.c b/crypto/algapi.c
> index 2545c5f89c4c..f5396c88e8cd 100644
> --- a/crypto/algapi.c
> +++ b/crypto/algapi.c
> @@ -258,6 +258,7 @@ static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
>  	list_add(&alg->cra_list, &crypto_alg_list);
>  	list_add(&larval->alg.cra_list, &crypto_alg_list);
>  
> +#ifdef CONFIG_CRYPTO_STATS
>  	atomic_set(&alg->encrypt_cnt, 0);
>  	atomic_set(&alg->decrypt_cnt, 0);
>  	atomic64_set(&alg->encrypt_tlen, 0);
> @@ -265,6 +266,7 @@ static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
>  	atomic_set(&alg->verify_cnt, 0);
>  	atomic_set(&alg->cipher_err_cnt, 0);
>  	atomic_set(&alg->sign_cnt, 0);
> +#endif
>  
If you created a helper function in crypto_user_stat.c to initalize all the
stats, you could ifdef it in the cryptouser.h header if unconfigured, and avoid
the ifdef leakage to this file above.

Neil

>  out:
>  	return larval;
> diff --git a/include/crypto/internal/cryptouser.h b/include/crypto/internal/cryptouser.h
> index 8db299c25566..3492ab42eefb 100644
> --- a/include/crypto/internal/cryptouser.h
> +++ b/include/crypto/internal/cryptouser.h
> @@ -3,6 +3,23 @@
>  
>  struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact);
>  
> +#ifdef CONFIG_CRYPTO_STATS
>  int crypto_dump_reportstat(struct sk_buff *skb, struct netlink_callback *cb);
>  int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs);
>  int crypto_dump_reportstat_done(struct netlink_callback *cb);
> +#else
> +static int crypto_dump_reportstat(struct sk_buff *skb, struct netlink_callback *cb)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static int crypto_dump_reportstat_done(struct netlink_callback *cb)
> +{
> +	return -ENOTSUPP;
> +}
> +#endif
> diff --git a/include/linux/crypto.h b/include/linux/crypto.h
> index 3634ad6fe202..3e05053b8d57 100644
> --- a/include/linux/crypto.h
> +++ b/include/linux/crypto.h
> @@ -515,6 +515,7 @@ struct crypto_alg {
>  	
>  	struct module *cra_module;
>  
> +#ifdef CONFIG_CRYPTO_STATS
>  	union {
>  		atomic_t encrypt_cnt;
>  		atomic_t compress_cnt;
> @@ -552,6 +553,7 @@ struct crypto_alg {
>  		atomic_t compute_shared_secret_cnt;
>  	};
>  	atomic_t sign_cnt;
> +#endif /* CONFIG_CRYPTO_STATS */
>  
>  } CRYPTO_MINALIGN_ATTR;
>  
> -- 
> 2.18.1
> 
>