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linke li 67ef2f3b02 ring-buffer: use READ_ONCE() to read cpu_buffer->commit_page in concurrent environment 
[ Upstream commit f1e30cb636 ]

In function ring_buffer_iter_empty(), cpu_buffer->commit_page is read
while other threads may change it. It may cause the time_stamp that read
in the next line come from a different page. Use READ_ONCE() to avoid
having to reason about compiler optimizations now and in future.

Link: https://lore.kernel.org/linux-trace-kernel/tencent_DFF7D3561A0686B5E8FC079150A02505180A@qq.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: linke li <lilinke99@qq.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-04-13 13:10:08 +02:00
Documentation x86/bhi: Mitigate KVM by default 2024-04-10 16:38:24 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
arch perf/x86/amd/lbr: Discard erroneous branch entries 2024-04-13 13:10:08 +02:00
block block: prevent division by zero in blk_rq_stat_sum() 2024-04-13 13:10:07 +02:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto Revert "crypto: pkcs7 - remove sha1 support" 2024-04-03 15:32:31 +02:00
drivers Input: xpad - add support for Snakebyte GAMEPADs 2024-04-13 13:10:08 +02:00
fs ext4: forbid commit inconsistent quota data when errors=remount-ro 2024-04-13 13:10:05 +02:00
include Input: allocate keycode for Display refresh rate toggle 2024-04-13 13:10:07 +02:00
init init: open /initrd.image with O_LARGEFILE 2024-04-03 15:32:37 +02:00
io_uring io_uring/kbuf: hold io_buffer_list reference over mmap 2024-04-10 16:38:16 +02:00
ipc shm: Slim down dependencies 2023-12-20 19:26:31 -05:00
kernel ring-buffer: use READ_ONCE() to read cpu_buffer->commit_page in concurrent environment 2024-04-13 13:10:08 +02:00
lib dump_stack: Do not get cpu_sync for panic CPU 2024-04-13 13:09:58 +02:00
mm x86/mm/pat: fix VM_PAT handling in COW mappings 2024-04-10 16:38:19 +02:00
net Bluetooth: Add new quirk for broken read key length on ATS2851 2024-04-13 13:10:02 +02:00
rust Rust changes for v6.8 2024-01-11 13:05:41 -08:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-09 15:57:48 -08:00
scripts kbuild: make -Woverride-init warnings more consistent 2024-04-10 16:38:00 +02:00
security selinux: avoid dereference of garbage after mount failure 2024-04-10 16:38:01 +02:00
sound ALSA: hda/realtek: Add quirk for Lenovo Yoga 9 14IMH9 2024-04-13 13:10:08 +02:00
tools ktest: force $buildonly = 1 for 'make_warnings_file' test type 2024-04-13 13:10:08 +02:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-03 15:32:03 +02:00
.clang-format clang-format: Update with v6.7-rc4's `for_each` macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
…
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore
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.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.mailmap drm fixes for 6.8 final 2024-03-08 12:44:56 -08:00
.rustfmt.toml
…
COPYING
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CREDITS MAINTAINERS: supplement of zswap maintainers update 2024-01-25 23:52:21 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
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MAINTAINERS drm fixes for 6.8 final 2024-03-08 12:44:56 -08:00
Makefile Linux 6.8.5 2024-04-10 16:38:25 +02:00
README
…

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 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.