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When physical memory is defined under z/VM using DEF STOR CONFIG, there may be memory holes that are not hotpluggable memory. In such cases, DCSS mapping could be placed in one of these memory holes. Subsequently, attempting memory access to such DCSS mapping would result in a kasan failure because there is no shadow memory mapping for it. To maintain consistency with cases where DCSS mapping is positioned after the kernel identity mapping, which is then covered by kasan zero shadow mapping, handle the scenario above by populating zero shadow mapping for memory holes where DCSS mapping could potentially be placed. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@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.