linux-kernel - [GIT PULL] modules changes for v6.2-rc1

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Date:   Mon, 12 Dec 2022 18:53:27 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     thunder.leizhen@...wei.com, swboyd@...omium.org,
        yang.lee@...ux.alibaba.com, linux@...musvillemoes.dk,
        petr.pavlu@...e.com, mwilck@...e.com, pmladek@...e.com,
        mcgrof@...nel.org, linux-modules@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [GIT PULL] modules changes for v6.2-rc1

The following changes since commit eb037f16f7e843722db5f0275d84b3f738d5649d:

  Merge tag 'perf-tools-fixes-for-v6.1-2-2022-11-10' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux (2022-11-11 09:45:30 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/ tags/modules-6.2-rc1

for you to fetch changes up to 4f1354d5c6a3264c91238962d1597eef40c40419:

  livepatch: Call klp_match_callback() in klp_find_callback() to avoid code duplication (2022-12-12 18:30:58 -0800)

----------------------------------------------------------------
modules changes for v6.2-rc1

Tux gets for xmass improving the average lookup performance of
kallsyms_lookup_name() by 715x thanks to the work by Zhen Lei, which
upgraded our old implementation from being O(n) to O(log(n)), while also
retaining the old implementation support on /proc/kallsyms. The only
penalty was increasing the memory footprint by 3 * kallsyms_num_syms.
Folks who want to improve this further now also have a dedicated selftest
facility through KALLSYMS_SELFTEST. Since I had to start reviewing other
future kallsyms / modules enhancements by Nick Alcock (his stuff is not
merged, it requires more work) I carefully reviewed and merged Zhen Lei's
kallsyms changes through modules-next tree a bit less than a month ago.
So this has been exposed on linux-next for about a month now with no
reported regressions.

Stephen Boyd added zstd in-kernel decompression support, but the only
users of this would be folks using the load-pin LSM because otherwise
we do module docompression in userspace. This is the newest code and
was merged last week on modules-next.

We spent a lot of time analyzing and coming to grips with a proper
fix to an old modules regression which only recently came to light
(since v5.3-rc1, May 2019) but even though I merged that fix onto
modules-next last week I'm having second thoughts about it now as I was
writing about that fix in this git tag message for you, as I found a few
things we cannot quite justify there yet. So I'm going to push back to the
drawing board again there until all i's are properly dotted. Yes, it's a
regression but the issue has been there for 2 years now and it came up
because of high end CPU count, it can wait a *tiny* bit more for a proper
fix.

The only other thing with mentioning is a minor boot time optimization by
Rasmus Villemoes which deferes param_sysfs_init() to late init. The rest
is cleanups and minor fixes.

----------------------------------------------------------------
Chen Zhongjin (1):
      module: Remove unused macros module_addr_min/max

Miaoqian Lin (1):
      module: Fix NULL vs IS_ERR checking for module_get_next_page

Rasmus Villemoes (2):
      module: remove redundant module_sysfs_initialized variable
      kernel/params.c: defer most of param_sysfs_init() to late_initcall time

Stephen Boyd (1):
      module/decompress: Support zstd in-kernel decompression

Yang Li (1):
      kallsyms: Remove unneeded semicolon

Zhen Lei (8):
      scripts/kallsyms: rename build_initial_tok_table()
      kallsyms: Improve the performance of kallsyms_lookup_name()
      kallsyms: Correctly sequence symbols when CONFIG_LTO_CLANG=y
      kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
      kallsyms: Add helper kallsyms_on_each_match_symbol()
      livepatch: Use kallsyms_on_each_match_symbol() to improve performance
      kallsyms: Add self-test facility
      livepatch: Call klp_match_callback() in klp_find_callback() to avoid code duplication

 include/linux/kallsyms.h   |   9 +
 include/linux/module.h     |   1 -
 init/Kconfig               |  13 ++
 kernel/Makefile            |   1 +
 kernel/kallsyms.c          | 116 +++++++++--
 kernel/kallsyms_internal.h |   1 +
 kernel/kallsyms_selftest.c | 485 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/kallsyms_selftest.h |  13 ++
 kernel/livepatch/core.c    |  31 +--
 kernel/module/Kconfig      |   3 +-
 kernel/module/decompress.c | 100 +++++++++-
 kernel/module/main.c       |   3 -
 kernel/module/sysfs.c      |   2 +-
 kernel/params.c            |  23 ++-
 scripts/kallsyms.c         |  78 +++++++-
 scripts/link-vmlinux.sh    |   4 +
 16 files changed, 840 insertions(+), 43 deletions(-)
 create mode 100644 kernel/kallsyms_selftest.c
 create mode 100644 kernel/kallsyms_selftest.h