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Linus Torvalds f1db825805 trace ring-buffer updates for v6.13 
- Limit time interrupts are disabled in rb_check_pages()
 
   The rb_check_pages() is called after the ring buffer size is updated to
   make sure that the ring buffer has not been corrupted. Commit
   c2274b908d ("ring-buffer: Fix a race between readers and resize
   checks") fixed a race with the check pages and simultaneous resizes to the
   ring buffer by adding a raw_spin_lock_irqsave() around the check
   operation. Although this was a simple fix, it would hold interrupts
   disabled for non determinative amount of time. This could harm PREEMPT_RT
   operations.
 
   Instead, modify the logic by adding a counter when the buffer is modified
   and to release the raw_spin_lock() at each iteration. It checks the
   counter under the lock to see if a modification happened during the loop,
   and if it did, it would restart the loop up to 3 times. After 3 times, it
   will simply exit the check, as it is unlikely that would ever happen as
   buffer resizes are rare occurrences.
 
 - Replace some open coded str_low_high() with the helper
 
 - Fix some documentation/comments
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Merge tag 'trace-ring-buffer-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull trace ring-buffer updates from Steven Rostedt:

 - Limit time interrupts are disabled in rb_check_pages()

   rb_check_pages() is called after the ring buffer size is updated to
   make sure that the ring buffer has not been corrupted. Commit
   c2274b908d ("ring-buffer: Fix a race between readers and resize
   checks") fixed a race with the check pages and simultaneous resizes
   to the ring buffer by adding a raw_spin_lock_irqsave() around the
   check operation. Although this was a simple fix, it would hold
   interrupts disabled for non determinative amount of time. This could
   harm PREEMPT_RT operations.

   Instead, modify the logic by adding a counter when the buffer is
   modified and to release the raw_spin_lock() at each iteration. It
   checks the counter under the lock to see if a modification happened
   during the loop, and if it did, it would restart the loop up to 3
   times. After 3 times, it will simply exit the check, as it is
   unlikely that would ever happen as buffer resizes are rare
   occurrences.

 - Replace some open coded str_low_high() with the helper

 - Fix some documentation/comments

* tag 'trace-ring-buffer-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Correct a grammatical error in a comment
  ring-buffer: Use str_low_high() helper in ring_buffer_producer()
  ring-buffer: Reorganize kerneldoc parameter names
  ring-buffer: Limit time with disabled interrupts in rb_check_pages()
2024-11-22 13:11:17 -08:00
arch - Add new infrastructure for reading TDX metadata 2024-11-22 13:07:19 -08:00
block for-6.13/block-20241118 2024-11-18 16:50:08 -08:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto Random number generator updates for Linux 6.13-rc1. 2024-11-19 10:43:44 -08:00
Documentation cxl changes for v6.13 2024-11-22 12:33:52 -08:00
drivers cxl changes for v6.13 2024-11-22 12:33:52 -08:00
fs cxl changes for v6.13 2024-11-22 12:33:52 -08:00
include cxl changes for v6.13 2024-11-22 12:33:52 -08:00
init printk changes for 6.13 2024-11-20 09:21:11 -08:00
io_uring A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
ipc fdget(), more trivial conversions 2024-11-03 01:28:06 -05:00
kernel trace ring-buffer updates for v6.13 2024-11-22 13:11:17 -08:00
lib cxl changes for v6.13 2024-11-22 12:33:52 -08:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm iommufd 6.13 merge window pull 2024-11-21 12:40:50 -08:00
net Networking changes for 6.13. 2024-11-21 08:28:08 -08:00
rust Networking changes for 6.13. 2024-11-21 08:28:08 -08:00
samples bpf-next-bpf-next-6.13 2024-11-21 08:11:04 -08:00
scripts \n 2024-11-21 09:50:18 -08:00
security \n 2024-11-21 09:55:45 -08:00
sound sound updates for 6.13-rc1 2024-11-21 14:39:31 -08:00
tools iommufd 6.13 merge window pull 2024-11-21 12:40:50 -08:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt the bulk of struct fd memory safety stuff 2024-11-18 12:24:06 -08:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap media updates for v6.13-rc1 2024-11-20 14:01:15 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS cgroup: Changes for v6.13 2024-11-20 09:54:49 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS drm for 6.13-rc1 2024-11-21 14:56:17 -08:00
Makefile Linux 6.12 2024-11-17 14:15:08 -08:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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.