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    SubjectRe: [2.6 patch] kernel/rcupdate.c: make the exports EXPORT_SYMBOL_GPL
    On Sun, Mar 27, 2005 at 04:34:54PM +0200, Adrian Bunk wrote:
    > Due to the patent situation at least in the USA, the exports of
    > kernel/rcupdate.c should be EXPORT_SYMBOL_GPL.

    Based on -what- line of reasoning??? The obvious ones do not apply
    to this situation.

    These need to be put back. Moving them to GPL -- but in a measured
    manner, as I proposed on this list some months ago -- is fine. Changing
    these particular exports precipitously is most definitely -not- fine.
    Here is my earlier proposal:

    See below for a patch that puts the exports back, along with an updated
    version of my earlier patch that starts the process of moving them to GPL.
    I will also be following this message with RFC patches that introduce
    two (EXPORT_SYMBOL_GPL) interfaces to replace synchronize_kernel(),
    which then becomes deprecated.

    Andrew, please apply.

    Thanx, Paul

    Signed-off-by: <>

    diff -urpN -X ../dontdiff linux-2.5-notyet/kernel/rcupdate.c linux-2.5/kernel/rcupdate.c
    --- linux-2.5-notyet/kernel/rcupdate.c Sat Apr 2 17:15:14 2005
    +++ linux-2.5/kernel/rcupdate.c Sat Apr 2 07:54:30 2005
    @@ -465,6 +465,6 @@ void synchronize_kernel(void)

    module_param(maxbatch, int, 0);
    +EXPORT_SYMBOL(call_rcu); /* WARNING: GPL-only in April 2006. */
    +EXPORT_SYMBOL(call_rcu_bh); /* WARNING: GPL-only in April 2006. */
    +EXPORT_SYMBOL(synchronize_kernel); /* WARNING: GPL-only in April 2006. */
    diff -urpN -X ../dontdiff linux-2.5-2005.04.02/Documentation/feature-removal-schedule.txt linux-2.5-2005.04.02-01/Documentation/feature-removal-schedule.txt
    --- linux-2.5-2005.04.02/Documentation/feature-removal-schedule.txt Sat Apr 2 07:48:46 2005
    +++ linux-2.5-2005.04.02-01/Documentation/feature-removal-schedule.txt Sat Apr 2 21:16:24 2005
    @@ -15,3 +15,16 @@ Why: It has been unmaintained for a numb
    against the LSB, and can be replaced by using udev.
    Who: Greg Kroah-Hartman <>

    +What: RCU API moves to EXPORT_SYMBOL_GPL
    +When: April 2006
    +Files: include/linux/rcupdate.h, kernel/rcupdate.c
    +Why: Outside of Linux, the only implementations of anything even
    + vaguely resembling RCU that I am aware of are in DYNIX/ptx,
    + VM/XA, Tornado, and K42. I do not expect anyone to port binary
    + drivers or kernel modules from any of these, since the first two
    + are owned by IBM and the last two are open-source research OSes.
    + So these will move to GPL after a grace period to allow
    + people, who might be using implementations that I am not aware
    + of, to adjust to this upcoming change.
    +Who: Paul E. McKenney <>
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