Messages in this thread | | | From | Roland Dreier <> | Date | Wed, 24 Nov 2004 11:23:37 -0800 | Subject | Re: [openib-general] Re: [PATCH][RFC/v1][4/12] Add InfiniBand SA (Subnet Administration) query support |
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Greg> No. RCU is covered by a patent that only allows for it to Greg> be implemented in GPL licensed code. If you want to use RCU Greg> in non-GPL code, you need to sign a license agreement with Greg> the holder of the RCU patent.
Not to stir up the flames any further (and this is really a moot point since I got rid of our use of RCU)...
But given that I could implement the same API as in rcupdate.h as below without using IBM's patented technique, how does merely using this API cause code to require a patent license?
Thanks, Roland
/* * Copyright (c) 2004 Topspin Communications. All rights reserved. * * Usage of the works is permitted provided that this instrument is * retained with the works, so that any entity that uses the works is * notified of this instrument. * * DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY. */
#ifndef MYRCU_H #define MYRCU_H
struct rcu_head { };
#define rcu_read_lock lock_kernel() #define rcu_read_unlock unlock_kernel()
#define rcu_dereference(p) (p) #define rcu_assign_pointer(p,v) do { \ lock_kernel(); \ (p) = (v); \ unlock_kernel(); \ } while (0)
static inline void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *head)) { lock_kernel(); func(head); unlock_kernel(); }
#endif /* MYRCU_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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