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CONFIG_STRICT_KERNEL_RWX should be set by default on every architectures (See https://github.com/KSPP/linux/issues/4) On PPC32 we have to find a compromise between performance and/or memory wasting and selection of strict_kernel_rwx, because it implies either smaller memory chunks or larger alignment between RO memory and RW memory. For instance the 8xx maps memory with 8M pages. So either the limit between RO and RW must be 8M aligned or it falls back or 512k pages which implies more pressure on the TLB. book3s/32 maps memory with BATs as much as possible. BATS can have any power-of-two size between 128k and 256M but we have only 4 to 8 BATs so the alignment must be good enough to allow efficient use of the BATs and avoid falling back on standard page mapping which would kill performance. So let's go one step forward and make it the default but still allow users to unset it when wanted. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/057c40164084bfc7d77c0b2ff78d95dbf6a2a21b.1632503622.git.christophe.leroy@csgroup.eu |
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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.