Am Donnerstag, 27. Oktober 2016, 18:53:45 CEST schrieb Jeffrey Walton: Hi Jeffrey, > >> preprocessor macros we can use to guard it? > > > > I am not entirely sure I understand the question. > > See, for example, > https://github.com/openssl/openssl/blob/master/engines/afalg/e_afalg.c > > The versions are kind of arbitrary because there's no easy way to tell > when the gear is available. If I recall from researching things, there > were two components needed for afalg, and they were supposedly > available back to later 2.x kernels. > > Things should "just work" for 3.x and 4.x kernels. But if "too early" > a kernel is encountered, then users experience the spectrum from > compile problems to unexplained runtime errors. I see. There are guards around zerocopy. AF_ALG appeared with 2.6.38 / 3.0 which already had zerocopy. I will try a 3.0 kernel with my current lib to see whether it works out of the box and apply fixes and guards if it does not. But I am not sure whether I should guard anything for 2.x kernels where we know that some folks simply backported the AF_ALG interface. Thanks a lot for the reminder. Ciao Stephan -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
