On Mon, Nov 04, 2024 at 09:29:34AM -0500, Derek Barbosa wrote: > In debug kernels, printk'ing during the SMP startup of a secondary CPU > results in a splat on boot that details illegal RCU usage from > offline CPUs. > > This patch aligns rcuwait_has_sleeper() with what currently exists in > Torvalds' tree, at commit 76f258bf3f2aa, and will avoid the > aforementioned splat. > > Furthermore, this patch makes it so that we avoid the use of hacky > rcu_derefrencing through the waiter's task struct,and instead leverages > the correct RCU API with the rcuwait_active() function. > > Reported-by: Andrew Halaney <ahalaney@xxxxxxxxxx> > Closes: https://lore.kernel.org/linux-rt-users/5x4nejpojrtny37k7l6loewqwuaituq77zc3tkkojvawcuvmml@thwg65fdb3vn > Reviewed-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> > Reviewed-by: John Ogness <john.ogness@xxxxxxxxxxxxx> > Signed-off-by: Derek Barbosa <debarbos@xxxxxxxxxx> Thanks for pushing this! Reviewed-by: Andrew Halaney <ajhalaney@xxxxxxxxx>
