linux-kernel - linux-next: build warning after merge of the rcu tree

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Date:   Wed, 15 Jun 2022 15:38:02 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build warning after merge of the rcu tree

Hi all,

After merging the rcu tree, today's linux-next build (htmldocs) produced
this warning:

Documentation/RCU/Design/Requirements/Requirements.rst:2220: WARNING: Malformed table.

+-----------------------------------------------------------------------+
| **Quick Quiz**:                                                       |
+-----------------------------------------------------------------------+
| But what if my driver has a hardware interrupt handler that can run   |
| for many seconds? I cannot invoke schedule() from an hardware         |
| interrupt handler, after all!                                         |
+-----------------------------------------------------------------------+
| **Answer**:                                                           |
+-----------------------------------------------------------------------+
| One approach is to do ``ct_irq_exit();ct_irq_enter();`` every so    |
| often. But given that long-running interrupt handlers can cause other |
| problems, not least for response time, shouldn't you work to keep     |
| your interrupt handler's runtime within reasonable bounds?            |
+-----------------------------------------------------------------------+

Introduced by commit

  6c5218715286 ("context_tracking: Take IRQ eqs entrypoints over RCU")

-- 
Cheers,
Stephen Rothwell

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