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The secondary CPU start C routine uses nodat_stack as a interim stack before finally switching to kernel_stack. Such scheme is superfluous, since the assembler restart interrupt handler (that secondary CPU starter is called from) does not need to use any stack for switching into DAT mode. Once DAT is on, any stack including virtually- mapped one could be used. Avoid the use of nodat_stack and smp_start_secondary() helper. Instead, initiate kernel_stack directly from the restart interrupt handler. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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.