王贇 ce5e48036c ftrace: disable preemption when recursion locked ... As the documentation explained, ftrace_test_recursion_trylock() and ftrace_test_recursion_unlock() were supposed to disable and enable preemption properly, however currently this work is done outside of the function, which could be missing by mistake. And since the internal using of trace_test_and_set_recursion() and trace_clear_recursion() also require preemption disabled, we can just merge the logical. This patch will make sure the preemption has been disabled when trace_test_and_set_recursion() return bit >= 0, and trace_clear_recursion() will enable the preemption if previously enabled. Link: https://lkml.kernel.org/r/13bde807-779c-aa4c-0672-20515ae365ea@linux.alibaba.com CC: Petr Mladek <pmladek@suse.com> Cc: Guo Ren <guoren@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: Joe Lawrence <joe.lawrence@redhat.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Jisheng Zhang <jszhang@kernel.org> CC: Steven Rostedt <rostedt@goodmis.org> CC: Miroslav Benes <mbenes@suse.cz> Reported-by: Abaci <abaci@linux.alibaba.com> Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Michael Wang <yun.wang@linux.alibaba.com> [ Removed extra line in comment - SDR ] Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2021-10-27 11:21:49 -04:00
..
core.c	kallsyms: refactor {,module_}kallsyms_on_each_symbol	2021-02-08 12:22:08 +01:00
core.h	livepatch: Keep replaced patches until post_patch callback is called	2019-11-01 13:08:08 +01:00
Kconfig	livepatch: Use the default ftrace_ops instead of REGS when ARGS is available	2020-11-13 12:15:28 -05:00
Makefile	livepatch: Basic API to track system state changes	2019-11-01 13:08:14 +01:00
patch.c	ftrace: disable preemption when recursion locked	2021-10-27 11:21:49 -04:00
patch.h	livepatch: Remove Nop structures when unused	2019-01-11 20:51:24 +01:00
shadow.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13	2019-05-21 11:28:45 +02:00
state.c	kernel/: fix repeated words in comments	2020-10-16 11:11:19 -07:00
state.h	livepatch: Allow to distinguish different version of system state changes	2019-11-01 13:08:19 +01:00
transition.c	livepatch: Replace deprecated CPU-hotplug functions.	2021-08-19 12:00:24 +02:00
transition.h	livepatch: Remove signal sysfs attribute	2019-01-16 22:09:33 +01:00