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2e958a8a51
The SYSCALL macros are mapped to symbols as follows: __SYSCALL_COMMON(nr, sym) --> __x64_<sym> __SYSCALL_X32(nr, sym) --> __x32_<sym> Originally, the syscalls in the x32 special range (512-547) were all compat. This assumption is now broken after the following commits:55db9c0e85("net: remove compat_sys_{get,set}sockopt")5f764d624a("fs: remove the compat readv/writev syscalls")598b3cec83("fs: remove compat_sys_vmsplice")c3973b401e("mm: remove compat_process_vm_{readv,writev}") Those commits redefined __x32_sys_* to __x64_sys_* because there is no stub like __x32_sys_*. Defining them as follows is more sensible and cleaner. __SYSCALL_COMMON(nr, sym) --> __x64_<sym> __SYSCALL_X32(nr, sym) --> __x64_<sym> This works because both x86_64 and x32 use the same ABI (RDI, RSI, RDX, R10, R8, R9) The ugly #define __x32_sys_* will go away. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210517073815.97426-2-masahiroy@kernel.org
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.