linux-kernel - [RESEND][PATCH 0/5] perf: Clean ups and simplifications

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Message-ID: <20250820180338.701352023@kernel.org>
Date: Wed, 20 Aug 2025 14:03:38 -0400
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org,
 linux-perf-users@...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>,
 Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>,
 Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>
Subject: [RESEND][PATCH 0/5] perf: Clean ups and simplifications


This is a resend from: https://lore.kernel.org/linux-trace-kernel/20250717173125.434618999@kernel.org/

It cleanly applied on top of the latest tip/perf/core:
  448f97fba901 ("perf: Convert mmap() refcounts to refcount_t")

The ongoing work to support sframes[1] in the kernel required a few clean ups
to the perf kernel side. Instead of having these changes in the ongoing
work, there's no reason they cannot be applied now.

These are just clean ups to the perf code to help simplify the updates that
will be made later.

[1] https://lore.kernel.org/linux-trace-kernel/20250708020003.565862284@kernel.org


Josh Poimboeuf (4):
      perf: Remove get_perf_callchain() init_nr argument
      perf: Have get_perf_callchain() return NULL if crosstask and user are set
      perf: Simplify get_perf_callchain() user logic
      perf: Skip user unwind if the task is a kernel thread

Steven Rostedt (1):
      perf: Use current->flags & PF_KTHREAD|PF_USER_WORKER instead of current->mm == NULL

----
 include/linux/perf_event.h |  2 +-
 kernel/bpf/stackmap.c      |  4 ++--
 kernel/events/callchain.c  | 40 +++++++++++++++++++---------------------
 kernel/events/core.c       |  9 +++++----
 4 files changed, 27 insertions(+), 28 deletions(-)