linux-kernel - [for-linus][PATCH 0/5] tracing: Fixes for v6.19

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Message-ID: <20260108155120.023038025@kernel.org>
Date: Thu, 08 Jan 2026 10:51:20 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: [for-linus][PATCH 0/5] tracing: Fixes for v6.19

tracing fixes for v6.19:

- Remove useless assignment of soft_mode variable

  The function __ftrace_event_enable_disable() sets "soft_mode" in one of
  the branch paths but doesn't use it after that. Remove the setting of that
  variable.

- Add a cond_resched() in ring_buffer_resize()

  The resize function that allocates all the pages for the ring buffer was
  causing a soft lockup on PREEMPT_NONE configs when allocating large
  buffers on machines with many CPUs. Hopefully this is the last
  cond_resched() needed to be added as PREEMPT_LAZY becomes the norm in the
  future.

- Make ftrace_graph_ent depth field signed

  The "depth" field of struct ftrace_graph_ent was converted from "int" to
  "unsigned long" for alignment reasons to work with being embedded in other
  structures. The conversion from a signed to unsigned caused integrity
  checks to always pass as they were comparing "depth" to less than zero.
  Make the field signed long.

- Add recursion protection to stack trace events

  A infinite recursion was triggered by a stack trace event calling RCU
  which internally called rcu_read_unlock_special(), which triggered an
  event that was also doing stacktraces which cause it to trigger the same
  RCU lock that called rcu_read_unlock_special() again.

  Update the trace_test_and_set_recursion() to add a set of context checks
  for events to use, and have the stack trace event use that for recursion
  protection.

- Make the variable ftrace_dump_on_oops static

  The cleanup of sysctl that moved all the updates to the files that use
  them moved the reference of ftrace_dump_on_oops to where it is used.
  It is no longer used outside of the trace.c file. Make it static.

  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace/fixes

Head SHA1: 1e2ed4bfd50ace3c4272cfab7e9aa90956fb7ae0

Ben Dooks (1):
      trace: ftrace_dump_on_oops[] is not exported, make it static

Julia Lawall (1):
      tracing: Drop unneeded assignment to soft_mode

Steven Rostedt (2):
      ftrace: Make ftrace_graph_ent depth field signed
      tracing: Add recursion protection in kernel stack trace recording

Wupeng Ma (1):
      ring-buffer: Avoid softlockup in ring_buffer_resize() during memory free

----
 include/linux/ftrace.h          | 2 +-
 include/linux/trace_recursion.h | 9 +++++++++
 kernel/trace/ring_buffer.c      | 2 ++
 kernel/trace/trace.c            | 8 +++++++-
 kernel/trace/trace_events.c     | 7 +++----
 5 files changed, 22 insertions(+), 6 deletions(-)