linux-kernel - 0087-rcu-Use-a-raw_spinlock

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Date:   Sun, 05 Apr 2020 06:53:43 +0200
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: 0087-rcu-Use-a-raw_spinlock_t-for-kfree-batching.patch

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