linux-kernel - [PATCH v3 0/2] add sysfs entry "patched" for each klp

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Date:   Fri, 2 Sep 2022 13:52:06 -0700
From:   Song Liu <song@...nel.org>
To:     <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jpoimboe@...nel.org>, <jikos@...nel.org>, <mbenes@...e.cz>,
        <pmladek@...e.com>, <joe.lawrence@...hat.com>,
        Song Liu <song@...nel.org>
Subject: [PATCH v3 0/2] add sysfs entry "patched" for each klp_object

I was debugging an issue that a livepatch appears to be attached, but
actually not. It turns out that there is a mismatch in module name
(abc-xyz vs. abc_xyz), klp_find_object_module failed to find the module.
Add a sysfs entry for each klp_object, so that it is easier to debug
such issues.

Changes v2 => v3:
1. Improve selftest. (Petr Mladek and Joe Lawrence)

Changes v1 => v2:
1. Add selftest. (Petr Mladek)
2. Update documentation. (Petr Mladek)
3. Use sysfs_emit. (Petr Mladek)

Song Liu (2):
  livepatch: add sysfs entry "patched" for each klp_object
  selftests/livepatch: add sysfs test

 .../ABI/testing/sysfs-kernel-livepatch        |  8 ++
 kernel/livepatch/core.c                       | 18 ++++
 tools/testing/selftests/livepatch/Makefile    |  3 +-
 .../testing/selftests/livepatch/functions.sh  | 34 ++++++++
 .../testing/selftests/livepatch/test-sysfs.sh | 86 +++++++++++++++++++
 5 files changed, 148 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/livepatch/test-sysfs.sh

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2.30.2