[0/3] kallsyms: Optimize the search for module symbols by livepatch and bpf

Message

Leizhen (ThunderTown) Dec. 30, 2022, 11:27 a.m. UTC

Patches 7-8 in [1] have been delayed until now due to merge conflicts. The
current patch 1/3 corresponds to patch 7/9 in [1], and the current patch 3/3
corresponds to patch 8/9 in [1]. But there are some changes. Originally, only
livepatch uses function module_kallsyms_on_each_symbol(), it find the specified
function for the specified module. Now, bpf also uses function
module_kallsyms_on_each_symbol(), it needs to traverse all the modules. So for
the new parameter 'modname' of module_kallsyms_on_each_symbol(), if it's NULL,
the symbols of all modules are still traversed for compatibility with the case
of bpf.

Patch 2/3 is new, as I understand it, it should be fine. If it doesn't work,
then patch 3/3 should be dropped.

[1] https://lkml.org/lkml/2022/11/2/225

Zhen Lei (3):
  livepatch: Improve the search performance of
    module_kallsyms_on_each_symbol()
  bpf: Optimize get_modules_for_addrs()
  kallsyms: Delete an unused parameter related to
    {module_}kallsyms_on_each_symbol()

 include/linux/kallsyms.h   |   3 +-
 include/linux/module.h     |   8 +--
 kernel/kallsyms.c          |   5 +-
 kernel/kallsyms_selftest.c |   6 +--
 kernel/livepatch/core.c    |  13 +----
 kernel/module/kallsyms.c   |  16 ++++--
 kernel/trace/bpf_trace.c   | 101 +++++++++++++++----------------------
 kernel/trace/ftrace.c      |   5 +-
 8 files changed, 67 insertions(+), 90 deletions(-)