On 2024-10-21, Derek Barbosa <debarbos@xxxxxxxxxx> wrote: > From 1188b21c357dcb750a6851d7e5fd2d1f70ca9690 Mon Sep 17 00:00:00 2001 > From: Derek Barbosa <debarbos@xxxxxxxxxx> > Date: Mon, 21 Oct 2024 11:30:30 -0400 > Subject: [PATCH 1/1] [PATCH] printk: nbcon: Fix illegal RCU usage on thread > wakeup > > In debug kernels, printk'ing during the SMP startup of a secondary CPU > results in a splat [0] 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. > > [0] https://lore.kernel.org/linux-rt-users/5x4nejpojrtny37k7l6loewqwuaituq77zc3tkkojvawcuvmml@thwg65fdb3vn/ > > Signed-off-by: Derek Barbosa <debarbos@xxxxxxxxxx> Thanks! Reviewed-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
