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Message-ID: <4BA689EA.4050102@imap.cc> Date: Sun, 21 Mar 2010 22:04:42 +0100 From: Tilman Schmidt <tilman@...p.cc> To: linux-kernel@...r.kernel.org Subject: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock_map) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I know there's not much sympathy for troubles with proprietary modules here, but the following might save some trouble to kernel developers as well as users forced to resort to proprietary drivers: Setting the kernel configuration option PROVE_RCU creates a reference to the GPL-exported global variable rcu_lock_map even in modules that do not use RCU. In the case of non-GPL modules, this leads to a build failure because of the license incompatibility. (I did not find out where that reference comes from.) So if building a proprietary module fails with the message: FATAL: modpost: GPL-incompatible module <module> uses GPL-only symbol 'rcu_lock_map' try rebuilding your kernel with the PROVE_RCU option disabled. Hope it helps someone. Tilman -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAkumieoACgkQQ3+did9BuFtC4gCggSE8DNVc8k9tasN7VOoQMR4G IKUAnj+SkzZjmJQPmUScvaY4zP8hR19o =2rDg -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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