mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-11-06 18:57:23 +00:00
No description
- C 96.8%
- Assembly 0.9%
- Rust 0.7%
- Shell 0.6%
- Python 0.5%
- Other 0.3%
d3a181588d
When the current task's FPSIMD/SVE/SME state may be live on *any* CPU in the system, special care must be taken when manipulating that state, as this manipulation can race with preemption and/or asynchronous usage of FPSIMD/SVE/SME (e.g. kernel-mode NEON in softirq handlers). Even when manipulation is is protected with get_cpu_fpsimd_context() and get_cpu_fpsimd_context(), the logic necessary when the state is live on the current CPU can be wildly different from the logic necessary when the state is not live on the current CPU. A number of historical and extant issues result from failing to handle these cases consistetntly and/or correctly. To make it easier to get such manipulation correct, add a new fpsimd_save_and_flush_current_state() helper function, which ensures that the current task's state has been saved to memory and any stale state on any CPU has been "flushed" such that is not live on any CPU in the system. This will allow code to safely manipulate the saved state without risk of races. Subsequent patches will use the new function. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Mark Brown <broonie@kernel.org> Cc: Will Deacon <will@kernel.org> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250409164010.3480271-11-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
History
|
|
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.