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Linus Torvalds b5a24181e4 Ring buffer fixes for 6.12: 
- Revert: "ring-buffer: Do not have boot mapped buffers hook to CPU hotplug"
 
   A crash that happened on cpu hotplug was actually caused by the incorrect
   ref counting that was fixed by commit 2cf9733891 ("ring-buffer: Fix
   refcount setting of boot mapped buffers"). The removal of calling cpu
   hotplug callbacks on memory mapped buffers was not an issue even though
   the tests at the time pointed toward it. But in fact, there's a check in
   that code that tests to see if the buffers are already allocated or not,
   and will not allocate them again if they are. Not calling the cpu hotplug
   callbacks ended up not initializing the non boot CPU buffers.
 
   Simply remove that change.
 
 - Clear all CPU buffers when starting tracing in a boot mapped buffer
 
   To properly process events from a previous boot, the address space needs to
   be accounted for due to KASLR and the events in the buffer are updated
   accordingly when read. This also requires that when the buffer has tracing
   enabled again in the current boot that the buffers are reset so that events
   from the previous boot do not interact with the events of the current boot
   and cause confusing due to not having the proper meta data.
 
   It was found that if a CPU is taken offline, that its per CPU buffer is not
   reset when tracing starts. This allows for events to be from both the
   previous boot and the current boot to be in the buffer at the same time.
   Clear all CPU buffers when tracing is started in a boot mapped buffer.
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Merge tag 'trace-ringbuffer-v6.12-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull ring buffer fixes from Steven Rostedt:

 - Revert: "ring-buffer: Do not have boot mapped buffers hook to CPU
   hotplug"

   A crash that happened on cpu hotplug was actually caused by the
   incorrect ref counting that was fixed by commit 2cf9733891
   ("ring-buffer: Fix refcount setting of boot mapped buffers"). The
   removal of calling cpu hotplug callbacks on memory mapped buffers was
   not an issue even though the tests at the time pointed toward it. But
   in fact, there's a check in that code that tests to see if the
   buffers are already allocated or not, and will not allocate them
   again if they are. Not calling the cpu hotplug callbacks ended up not
   initializing the non boot CPU buffers.

   Simply remove that change.

 - Clear all CPU buffers when starting tracing in a boot mapped buffer

   To properly process events from a previous boot, the address space
   needs to be accounted for due to KASLR and the events in the buffer
   are updated accordingly when read. This also requires that when the
   buffer has tracing enabled again in the current boot that the buffers
   are reset so that events from the previous boot do not interact with
   the events of the current boot and cause confusing due to not having
   the proper meta data.

   It was found that if a CPU is taken offline, that its per CPU buffer
   is not reset when tracing starts. This allows for events to be from
   both the previous boot and the current boot to be in the buffer at
   the same time. Clear all CPU buffers when tracing is started in a
   boot mapped buffer.

* tag 'trace-ringbuffer-v6.12-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing/ring-buffer: Clear all memory mapped CPU ring buffers on first recording
  Revert: "ring-buffer: Do not have boot mapped buffers hook to CPU hotplug"
2024-11-16 08:12:43 -08:00
arch This push fixes a regression in the MIPS CRC32C code. 2024-11-15 10:04:39 -08:00
block block-6.12-20241101 2024-11-01 13:41:55 -10:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push fixes the following issues: 2024-10-16 08:42:54 -07:00
Documentation Including fixes from bluetooth. 2024-11-14 10:05:33 -08:00
drivers A Single RISC-V Fix for 6.12-rc8 2024-11-15 11:44:32 -08:00
fs for-6.12-rc7-tag 2024-11-15 09:45:32 -08:00
include drm fixes for 6.12-rc8 2024-11-15 10:53:42 -08:00
init cfi: fix conditions for HAVE_CFI_ICALL_NORMALIZE_INTEGERS 2024-10-13 22:23:13 +02:00
io_uring io_uring/rw: fix missing NOWAIT check for O_DIRECT start write 2024-10-31 08:21:02 -06:00
ipc struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
kernel Ring buffer fixes for 6.12: 2024-11-16 08:12:43 -08:00
lib objpool: fix to make percpu slot allocation more robust 2024-11-07 14:14:58 -08:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm 10 hotfixes, 7 of which are cc:stable. 7 are MM, 3 are not. All 2024-11-13 08:58:11 -08:00
net Including fixes from bluetooth. 2024-11-14 10:05:33 -08:00
rust Driver core fix for 6.12-rc3 2024-10-13 09:10:52 -07:00
samples Including fixes from bluetooth. 2024-11-14 10:05:33 -08:00
scripts Kbuild fixes for v6.12 (2nd) 2024-11-03 08:29:02 -10:00
security integrity-v6.12 2024-11-12 13:06:31 -08:00
sound ASoC: Fixes for v6.12 2024-11-14 16:40:15 +01:00
tools Including fixes from bluetooth. 2024-11-14 10:05:33 -08:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt ARM64: 2024-10-21 11:22:04 -07:00
.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 Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.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 mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -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 Including fixes from bluetooth. 2024-11-14 10:05:33 -08:00
Makefile Linux 6.12-rc7 2024-11-10 14:19:35 -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.