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

From: Mathieu Desnoyers
Date: Thu Apr 09 2020 - 15:36:34 EST


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(-)

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2.17.1