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cc00550b2a
This reverts commitff123eb774. Allowing large pages for KASAN shadow mappings isn't inherently wrong, but adding POPULATE_KASAN_MAP_SHADOW to large_allowed() exposes an issue in can_large_pud() and can_large_pmd(). Since commitd8073dc6bc("s390/mm: Allow large pages only for aligned physical addresses"), both can_large_pud() and can_large_pmd() call _pa() to check if large page physical addresses are aligned. However, _pa() has a side effect: it allocates memory in POPULATE_KASAN_MAP_SHADOW mode. This results in massive memory leaks. The proper fix would be to address both large_allowed() and _pa()'s side effects, but for now, revert this change to avoid the leaks. Fixes:ff123eb774("s390/mm: Allow large pages for KASAN shadow mapping") Signed-off-by: Vasily Gorbik <gor@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
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText 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.