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Daniil Tatianin 67e1b0052f printk_ringbuffer: don't needlessly wrap data blocks around
Previously, data blocks that perfectly fit the data ring buffer would
get wrapped around to the beginning for no reason since the calculated
offset of the next data block would belong to the next wrap. Since this
offset is not actually part of the data block, but rather the offset of
where the next data block is going to start, there is no reason to
include it when deciding whether the current block fits the buffer.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Tested-by: John Ogness <john.ogness@linutronix.de>
Link: https://patch.msgid.link/20250905144152.9137-2-d-tatianin@yandex-team.ru
[pmladek@suse.com: Updated indentation.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
History 2025-10-22 14:03:36 +02:00
arch This includes the following changes related to sparc for v6.18: 2025-10-04 10:59:06 -07:00
block Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
Documentation RISC-V updates for the v6.18 merge window (part two) 2025-10-04 10:36:22 -07:00
drivers This includes the following changes related to sparc for v6.18: 2025-10-04 10:59:06 -07:00
fs It has been a relatively busy cycle in docsland, with changes all over: 2025-10-03 17:16:13 -07:00
include mm/mm_init: simplify deferred initialization of struct pages 2025-10-04 11:03:10 -07:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel printk_ringbuffer: don't needlessly wrap data blocks around 2025-10-22 14:03:36 +02:00
lib Patch series in this pull request: 2025-10-02 18:44:54 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/mm_init: simplify deferred initialization of struct pages 2025-10-04 11:03:10 -07:00
net NFS Client Updates for Linux 6.18 2025-10-03 14:20:40 -07:00
rust dma-mapping updates for Linux 6.18: 2025-10-03 17:41:12 -07:00
samples Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
scripts It has been a relatively busy cycle in docsland, with changes all over: 2025-10-03 17:16:13 -07:00
security file->f_path constification 2025-10-03 16:32:36 -07:00
sound sound updates for 6.18-rc1 2025-10-02 11:37:19 -07:00
tools guest_memfd: 2025-10-04 08:52:16 -07:00
usr gen_init_cpio: add -a <data_align> as reflink optimization 2025-08-20 16:02:56 -07:00
virt KVM common changes for 6.18 2025-09-30 13:27:59 -04:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +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: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap VFIO updates for v6.18-rc1 2025-10-04 08:24:54 -07:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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 MAINTAINERS: Delete inactive maintainers from AF_XDP 2025-09-25 13:18:22 +02:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS RISC-V updates for the v6.18 merge window (part two) 2025-10-04 10:36:22 -07:00
Makefile It has been a relatively busy cycle in docsland, with changes all over: 2025-10-03 17:16:13 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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.