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Ritesh Harjani (IBM)
47780e7eae
Kfence on book3s Hash on pseries is anyways broken. It fails to boot due to RMA size limitation. That is because, kfence with Hash uses debug_pagealloc infrastructure. debug_pagealloc allocates linear map for entire dram size instead of just kfence relevant objects. This means for 16TB of DRAM it will require (16TB >> PAGE_SHIFT) which is 256MB which is half of RMA region on P8. crash kernel reserves 256MB and we also need 2048 * 16KB * 3 for emergency stack and some more for paca allocations. That means there is not enough memory for reserving the full linear map in the RMA region, if the DRAM size is too big (>=16TB) (The issue is seen above 8TB with crash kernel 256 MB reservation). Now Kfence does not require linear memory map for entire DRAM. It only needs for kfence objects. So this patch temporarily removes the kfence functionality since debug_pagealloc code needs some refactoring. We will bring in kfence on Hash support in later patches. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://patch.msgid.link/1761bc39674473c8878dedca15e0d9a0d3a1b528.1729271995.git.ritesh.list@gmail.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 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.