mirror of
https://github.com/torvalds/linux.git
synced 2026-10-07 05:31:08 -04:00
Sebastian Andrzej Siewior
383c252545
Add TIF_NEED_FPU_LOAD. This flag is used for loading the FPU registers before returning to userland. It must not be set on systems without a FPU. If this flag is cleared, the CPU's FPU registers hold the latest, up-to-date content of the current task's (current()) FPU registers. The in-memory copy (union fpregs_state) is not valid. If this flag is set, then all of CPU's FPU registers may hold a random value (except for PKRU) and it is required to load the content of the FPU registers on return to userland. Introduce it now as a preparatory change before adding the main feature. Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Dave Hansen <[email protected]> Reviewed-by: Thomas Gleixner <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Aubrey Li <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jann Horn <[email protected]> Cc: "Jason A. Donenfeld" <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Cc: kvm ML <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Radim Krčmář <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Tim Chen <[email protected]> Cc: x86-ml <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
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.