linux-kernel - [RFT][PATCH v2 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter

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Date:   Mon, 22 Jun 2020 15:50:42 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Dan Williams <dan.j.williams@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>
Cc:     rafael.j.wysocki@...el.com, Len Brown <lenb@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Ira Weiny <ira.weiny@...el.com>,
        James Morse <james.morse@....com>,
        Myron Stowe <myron.stowe@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-nvdimm@...ts.01.org, Bob Moore <robert.moore@...el.com>
Subject: [RFT][PATCH v2 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter

Hi All,

This series is to address the problem with RCU synchronization occurring,
possibly relatively often, inside of acpi_ex_system_memory_space_handler(),
when the namespace and interpreter mutexes are held.

Like I said before, I had decided to change the approach used in the previous
iteration of this series and to allow the unmap operations carried out by 
acpi_ex_system_memory_space_handler() to be deferred in the first place,
which is done in patches [1-2/4].

However, it turns out that the "fast-path" mapping is still useful on top of
the above to reduce the number of ioremap-iounmap cycles for the same address
range and so it is introduced by patches [3-4/4].

For details, please refer to the patch changelogs.

The series is available from the git branch at

 git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \
 acpica-osl

for easier testing.

Cheers,
Rafael