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d55c5f28af
The trusted OS may reject CPU_OFF calls to its resident CPU, so we must avoid issuing those. We never migrate a Trusted OS and we already take care to prevent CPU_OFF PSCI call. However, this is not reflected explicitly to the userspace. Any user can attempt to hotplug trusted OS resident CPU. The entire motion of going through the various state transitions in the CPU hotplug state machine gets executed and the PSCI layer finally refuses to make CPU_OFF call. This results is unnecessary unwinding of CPU hotplug state machine in the kernel. Instead we can mark the trusted OS resident CPU as not available for hotplug, so that the user attempt or request to do the same will get immediately rejected. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Will Deacon <will@kernel.org> |
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| README | ||
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.