user/sven/linux.git/kernel/livepatch/transition.c, branch v5.15.8

livepatch: Replace deprecated CPU-hotplug functions.

2021-08-19T10:00:24Z

The functions get_online_cpus() and put_online_cpus() have been deprecated during the CPU hotplug rework. They map directly to cpus_read_lock() and cpus_read_unlock(). Replace deprecated CPU-hotplug functions with the official version. The behavior remains unchanged. Cc: Josh Poimboeuf Cc: Jiri Kosina Cc: Miroslav Benes Cc: Petr Mladek Cc: Joe Lawrence Cc: live-patching@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Petr Mladek Signed-off-by: Jiri Kosina

livepatch: Replace the fake signal sending with TIF_NOTIFY_SIGNAL infrastructure

2021-03-30T07:40:21Z

Livepatch sends a fake signal to all remaining blocking tasks of a running transition after a set period of time. It uses TIF_SIGPENDING flag for the purpose. Commit 12db8b690010 ("entry: Add support for TIF_NOTIFY_SIGNAL") added a generic infrastructure to achieve the same. Replace our bespoke solution with the generic one. Reviewed-by: Jens Axboe Reviewed-by: Petr Mladek Acked-by: Joe Lawrence Signed-off-by: Miroslav Benes Signed-off-by: Jiri Kosina

livepatch: Keep replaced patches until post_patch callback is called

2019-11-01T12:08:08Z

Pre/post (un)patch callbacks might manipulate the system state. Cumulative livepatches might need to take over the changes made by the replaced ones. For this they might need to access some data stored or referenced by the old livepatches. Therefore the replaced livepatches have to stay around until post_patch() callback is called. It is achieved by calling the free functions later. It is the same location where disabled livepatches have already been freed. Link: http://lkml.kernel.org/r/20191030154313.13263-2-pmladek@suse.com To: Jiri Kosina Cc: Kamalesh Babulal Cc: Nicolai Stange Cc: live-patching@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Miroslav Benes Acked-by: Joe Lawrence Acked-by: Josh Poimboeuf Signed-off-by: Petr Mladek

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

2019-07-11T22:30:05Z

Pull livepatching updates from Jiri Kosina: - stacktrace handling improvements from Miroslav benes - debug output improvements from Petr Mladek * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: livepatch: Remove duplicate warning about missing reliable stacktrace support Revert "livepatch: Remove reliable stacktrace check in klp_try_switch_task()" stacktrace: Remove weak version of save_stack_trace_tsk_reliable() livepatch: Use static buffer for debugging messages under rq lock livepatch: Remove stale kobj_added entries from kernel-doc descriptions

livepatch: Remove duplicate warning about missing reliable stacktrace support

2019-06-20T14:19:13Z

WARN_ON_ONCE() could not be called safely under rq lock because of console deadlock issues. Moreover WARN_ON_ONCE() is superfluous in klp_check_stack(), because stack_trace_save_tsk_reliable() cannot return -ENOSYS thanks to klp_have_reliable_stack() check in klp_try_switch_task(). [ mbenes: changelog edited ] Signed-off-by: Miroslav Benes Acked-by: Josh Poimboeuf Reviewed-by: Kamalesh Babulal Signed-off-by: Petr Mladek

Revert "livepatch: Remove reliable stacktrace check in klp_try_switch_task()"

2019-06-20T14:08:41Z

This reverts commit 1d98a69e5cef3aeb68bcefab0e67e342d6bb4dad. Commit 31adf2308f33 ("livepatch: Convert error about unsupported reliable stacktrace into a warning") weakened the enforcement for architectures to have reliable stack traces support. The system only warns now about it. It only makes sense to reintroduce the compile time checking in klp_try_switch_task() again and bail out early. Signed-off-by: Miroslav Benes Acked-by: Josh Poimboeuf Reviewed-by: Kamalesh Babulal Signed-off-by: Petr Mladek

livepatch: Use static buffer for debugging messages under rq lock

2019-06-05T14:35:47Z

The err_buf array uses 128 bytes of stack space. Move it off the stack by making it static. It's safe to use a shared buffer because klp_try_switch_task() is called under klp_mutex. Acked-by: Miroslav Benes Acked-by: Josh Poimboeuf Reviewed-by: Kamalesh Babulal Signed-off-by: Petr Mladek

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21T09:28:45Z

Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details [based] [from] [clk] [highbank] [c] you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 355 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Kate Stewart Reviewed-by: Jilayne Lovejoy Reviewed-by: Steve Winslow Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154041.837383322@linutronix.de Signed-off-by: Greg Kroah-Hartman

livepatch: Simplify stack trace retrieval

2019-04-29T10:37:56Z

Replace the indirection through struct stack_trace by using the storage array based interfaces. Signed-off-by: Thomas Gleixner Reviewed-by: Josh Poimboeuf Acked-by: Miroslav Benes Cc: Andy Lutomirski Cc: Steven Rostedt Cc: Alexander Potapenko Cc: Alexey Dobriyan Cc: Andrew Morton Cc: Christoph Lameter Cc: Pekka Enberg Cc: linux-mm@kvack.org Cc: David Rientjes Cc: Catalin Marinas Cc: Dmitry Vyukov Cc: Andrey Ryabinin Cc: kasan-dev@googlegroups.com Cc: Mike Rapoport Cc: Akinobu Mita Cc: Christoph Hellwig Cc: iommu@lists.linux-foundation.org Cc: Robin Murphy Cc: Marek Szyprowski Cc: Johannes Thumshirn Cc: David Sterba Cc: Chris Mason Cc: Josef Bacik Cc: linux-btrfs@vger.kernel.org Cc: dm-devel@redhat.com Cc: Mike Snitzer Cc: Alasdair Kergon Cc: Daniel Vetter Cc: intel-gfx@lists.freedesktop.org Cc: Joonas Lahtinen Cc: Maarten Lankhorst Cc: dri-devel@lists.freedesktop.org Cc: David Airlie Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Tom Zanussi Cc: linux-arch@vger.kernel.org Link: https://lkml.kernel.org/r/20190425094803.437950229@linutronix.de

Merge branch 'for-5.1/atomic-replace' into for-linus

2019-03-05T14:56:59Z

The atomic replace allows to create cumulative patches. They are useful when you maintain many livepatches and want to remove one that is lower on the stack. In addition it is very useful when more patches touch the same function and there are dependencies between them. It's also a feature some of the distros are using already to distribute their patches.