[RFT][PATCH v2 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter
From: Rafael J. Wysocki
Date: Mon Jun 22 2020 - 10:03:32 EST
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