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Steven Rostedt 39603bb38c fgraph: Fix set_graph_notrace with setting TRACE_GRAPH_NOTRACE_BIT 
commit c8c9b1d2d5 upstream.

The code was restructured where the function graph notrace code, that
would not trace a function and all its children is done by setting a
NOTRACE flag when the function that is not to be traced is hit.

There's a TRACE_GRAPH_NOTRACE_BIT which defines the bit in the flags and a
TRACE_GRAPH_NOTRACE which is the mask with that bit set. But the
restructuring used TRACE_GRAPH_NOTRACE_BIT when it should have used
TRACE_GRAPH_NOTRACE.

For example:

 # cd /sys/kernel/tracing
 # echo set_track_prepare stack_trace_save  > set_graph_notrace
 # echo function_graph > current_tracer
 # cat trace
[..]
 0)               |                          __slab_free() {
 0)               |                            free_to_partial_list() {
 0)               |                                  arch_stack_walk() {
 0)               |                                    __unwind_start() {
 0)   0.501 us    |                                      get_stack_info();

Where a non filter trace looks like:

 # echo > set_graph_notrace
 # cat trace
 0)               |                            free_to_partial_list() {
 0)               |                              set_track_prepare() {
 0)               |                                stack_trace_save() {
 0)               |                                  arch_stack_walk() {
 0)               |                                    __unwind_start() {

Where the filter should look like:

 # cat trace
 0)               |                            free_to_partial_list() {
 0)               |                              _raw_spin_lock_irqsave() {
 0)   0.350 us    |                                preempt_count_add();
 0)   0.351 us    |                                do_raw_spin_lock();
 0)   2.440 us    |                              }

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250208001511.535be150@batman.local.home
Fixes: b84214890a ("function_graph: Move graph notrace bit to shadow stack global var")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-02-17 10:05:40 +01:00
arch parisc: Temporarily disable jump label support 2025-02-17 10:05:29 +01:00
block block: don't revert iter for -EIOCBQUEUED 2025-02-17 10:05:19 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix boot-up self-test race 2025-02-08 09:57:28 +01:00
Documentation arm64: Filter out SVE hwcaps when FEAT_SVE isn't implemented 2025-02-17 10:05:04 +01:00
drivers mailbox: zynqmp: Remove invalid __percpu annotation in zynqmp_ipi_probe() 2025-02-17 10:05:40 +01:00
fs NFSD: Encode COMPOUND operation status on page boundaries 2025-02-17 10:05:40 +01:00
include iommufd: Fix struct iommu_hwpt_pgfault init and padding 2025-02-17 10:05:31 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring/net: don't retry connect operation on EPOLLERR 2025-02-17 10:05:38 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel fgraph: Fix set_graph_notrace with setting TRACE_GRAPH_NOTRACE_BIT 2025-02-17 10:05:40 +01:00
lib atomic64: Use arch_spin_locks instead of raw_spin_locks 2025-02-17 10:05:14 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/compaction: fix UBSAN shift-out-of-bounds warning 2025-02-17 10:05:36 +01:00
net NFC: nci: Add bounds checking in nci_hci_create_pipe() 2025-02-17 10:05:40 +01:00
rust rust: init: use explicit ABI to clean warning in future compilers 2025-02-17 10:05:23 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-02-08 09:57:11 +01:00
scripts x86: rust: set rustc-abi=x86-softfloat on rustc>=1.86.0 2025-02-17 10:05:23 +01:00
security KEYS: trusted: dcp: fix improper sg use with CONFIG_VMAP_STACK=y 2025-02-17 10:05:09 +01:00
sound ALSA: hda: Fix headset detection failure due to unstable sort 2025-02-17 10:05:20 +01:00
tools selftests: mptcp: connect: -f: no reconnect 2025-02-17 10:05:39 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.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 MAINTAINERS: update location of media main tree 2024-12-05 14:02:42 +01:00
Makefile Linux 6.12.13 2025-02-08 09:58:20 +01:00
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.