0087-rcu-Use-a-raw_spinlock_t-for-kfree-batching.patch

[Mike Galbraith]

Hi Sebastian,

Just a heads up wrt $subject...

I had done the same in my 5.6 tree, but then 5.7 came along, and I had
to revisit due to 34c881745549e adding an allocation under that lock
with irqs disabled.  The same commit that added the lock added this.

	local_irq_save(flags);  // For safely calling this_cpu_ptr().

Whacking that instead of converting the lock cures 5.6 and 5.7 woes.

	-Mike