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60d043c101
The PROT_* macros resolve to expressions that are only valid in C and not in assembler, and so they are only usable from C code. Currently, we make an exception for the permission indirection init code in proc.S, which doesn't care about the bits that are conditionally set, and so we just #define PTE_MAYBE_NG to 0x0 for any assembler file that includes these definitions. This is dodgy because this means that PROT_NORMAL and friends is generally available in asm code, but defined in a way that deviates from the definition that C code will observe, which might lead to hard to diagnose issues down the road. So instead, #define PTE_MAYBE_NG only in the place where the PIE constants are evaluated, and #undef it again right after. This allows us to drop the #define from pgtable-prot.h, and avoid the risk of deviating definitions between asm and C. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-72-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.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.