android_kernel_motorola_sm6375/kernel/livepatch
Repository files (latest commit first)
Filename Latest commit message Latest commit date
Miroslav Benes 93d31322f7
UPSTREAM: ftrace: Introduce PERMANENT ftrace_ops flag
Livepatch uses ftrace for redirection to new patched functions. It means
that if ftrace is disabled, all live patched functions are disabled as
well. Toggling global 'ftrace_enabled' sysctl thus affect it directly.
It is not a problem per se, because only administrator can set sysctl
values, but it still may be surprising.

Introduce PERMANENT ftrace_ops flag to amend this. If the
FTRACE_OPS_FL_PERMANENT is set on any ftrace ops, the tracing cannot be
disabled by disabling ftrace_enabled. Equally, a callback with the flag
set cannot be registered if ftrace_enabled is disabled.

Link: http://lkml.kernel.org/r/20191016113316.13415-2-mbenes@suse.cz

Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Change-Id: I78f8241bb5b63fe020a33131604ff447620c3a95
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2025-12-23 13:35:45 -08:00
..
core.c
core.h
Kconfig
Makefile
patch.c UPSTREAM: ftrace: Introduce PERMANENT ftrace_ops flag 2025-12-23 13:35:45 -08:00
patch.h
shadow.c
transition.c livepatch: fix race between fork and KLP transition 2022-10-26 13:22:18 +02:00
transition.h