linux-kernel - [RFC PATCH 0/9] Export information needed by the LTTng kernel tracer

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Message-Id: <20200409193543.18115-1-mathieu.desnoyers@efficios.com>
Date:   Thu,  9 Apr 2020 15:35:34 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, akpm@...ux-foundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, rostedt@...dmis.org,
        Alexei Starovoitov <ast@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH 0/9] Export information needed by the LTTng kernel tracer

Recently commit 0bd476e6c6 "kallsyms: unexport kallsyms_lookup_name()
and kallsyms_on_each_symbol()" was merged upstream. As discussed
previously [1], LTTng-modules (a GPL kernel tracer module) currently
uses kallsyms to lookup some missing symbols.

This patch set integrates the required changes to the kernel code
wherever those changes are generally useful, and adds a few GPL-exports
targeting the information currently missing so LTTng modules can be
entirely free of kallsyms.

Feedback is welcome,

Thanks,

Mathieu

[1] https://lore.kernel.org/r/20200302192811.n6o5645rsib44vco@localhost

Mathieu Desnoyers (9):
  tracepoint: call vmalloc_sync_mappings() on registration
  bpf: allow up to 13 arguments for tracepoints
  writeback: tracing: pass global_wb_domain as tracepoint parameter
  stacktrace: export-GPL stack_trace_save_user
  sched: export-GPL task_prio
  mm: export-GPL get_pageblock_migratetype
  block: genhd: export-GPL gendisk_name
  block: genhd: export-GPL generic disk device type
  block: genhd: export-GPL generic disk block class

 block/bio.c                      |  2 +-
 block/blk-settings.c             |  2 +-
 block/blk.h                      |  2 +-
 block/genhd.c                    | 38 ++++++++++++++++++++++++--------
 block/partitions/core.c          |  4 ++--
 drivers/base/class.c             |  2 +-
 drivers/base/core.c              | 15 +++++++------
 drivers/base/devtmpfs.c          |  2 +-
 include/linux/genhd.h            |  4 +++-
 include/linux/kernel.h           |  6 ++---
 include/linux/trace_events.h     |  3 +++
 include/trace/bpf_probe.h        |  3 ++-
 include/trace/events/writeback.h | 17 ++++++++------
 init/do_mounts.c                 |  4 ++--
 kernel/sched/core.c              |  1 +
 kernel/stacktrace.c              |  1 +
 kernel/trace/bpf_trace.c         |  8 ++++---
 kernel/tracepoint.c              |  2 ++
 mm/page-writeback.c              |  9 ++++----
 mm/page_alloc.c                  |  1 +
 20 files changed, 82 insertions(+), 44 deletions(-)

-- 
2.17.1