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    Subject[PATCH 4.10 096/167] crypto: api - Add crypto_requires_off helper
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Herbert Xu <herbert@gondor.apana.org.au>

    commit 016df0abc56ec06d0c63c5318ef53e40738dea8b upstream.

    This patch adds crypto_requires_off which is an extension of
    crypto_requires_sync for similar bits such as NEED_FALLBACK.

    Suggested-by: Marcelo Cerri <marcelo.cerri@canonical.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/crypto/algapi.h | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    --- a/include/crypto/algapi.h
    +++ b/include/crypto/algapi.h
    @@ -344,13 +344,18 @@ static inline struct crypto_alg *crypto_
    return crypto_attr_alg(tb[1], type, mask);
    }

    +static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
    +{
    + return (type ^ off) & mask & off;
    +}
    +
    /*
    * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
    * Otherwise returns zero.
    */
    static inline int crypto_requires_sync(u32 type, u32 mask)
    {
    - return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
    + return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
    }

    noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);

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