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[ Upstream commit d3c4b6f64ad356c0d9ddbcf73fa471e6a841cc5c ] ACPICA commit 0762982923f95eb652cf7ded27356b247c9774de During wakeup from system-wide sleep states, acpi_get_sleep_type_data() is called and it tries to get memory from the slab allocator in order to evaluate a control method, but if KFENCE is enabled in the kernel, the memory allocation attempt causes an IRQ work to be queued and a self-IPI to be sent to the CPU running the code which requires the memory controller to be ready, so if that happens too early in the wakeup path, it doesn't work. Prevent that from taking place by calling acpi_get_sleep_type_data() for S0 upfront, when preparing to enter a given sleep state, and saving the data obtained by it for later use during system wakeup. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214271 Reported-by: Reik Keutterling <spielkind@gmail.com> Tested-by: Reik Keutterling <spielkind@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.