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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
..
probes ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
vdso riscv: explicitly use symbol offsets for VDSO 2021-08-24 21:45:47 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
asm-offsets.c riscv: Introduce structure that group all variables regarding kernel mapping 2021-07-05 18:04:00 -07:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cpu-hotplug.c RISC-V: Support cpu hotplug 2020-03-31 11:28:30 -07:00
cpu.c RISC-V: Rename and move plic_find_hart_id() to arch directory 2020-06-09 19:11:20 -07:00
cpu_ops.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cpu_ops_sbi.c RISC-V: Support cpu hotplug 2020-03-31 11:28:30 -07:00
cpu_ops_spinwait.c RISC-V: Add cpu_ops and modify default booting method 2020-03-31 11:25:56 -07:00
cpufeature.c riscv: Add __init section marker to some functions again 2021-05-29 13:39:27 -07:00
crash_dump.c RISC-V: Add crash kernel support 2021-04-26 08:25:24 -07:00
crash_save_regs.S RISC-V: Add kdump support 2021-04-26 08:25:23 -07:00
efi-header.S RISC-V: Add PE/COFF header for EFI stub 2020-10-02 14:31:16 -07:00
efi.c RISC-V: Add EFI runtime services 2020-10-02 14:31:28 -07:00
entry.S riscv: add VMAP_STACK overflow detection 2021-07-06 12:11:38 -07:00
fpu.S
ftrace.c ftrace: Cleanup ftrace_dyn_arch_init() 2021-10-08 19:41:39 -04:00
head.h RISC-V: enable XIP 2021-04-26 08:31:28 -07:00
head.S riscv: Introduce structure that group all variables regarding kernel mapping 2021-07-05 18:04:00 -07:00
image-vars.h arch/riscv:fix typo in a comment in arch/riscv/kernel/image-vars.h 2021-02-18 23:18:00 -08:00
irq.c RISC-V: Remove do_IRQ() function 2020-06-09 19:11:24 -07:00
jump_label.c riscv: Add jump-label implementation 2020-07-30 11:37:43 -07:00
kexec_relocate.S riscv: Introduce structure that group all variables regarding kernel mapping 2021-07-05 18:04:00 -07:00
kgdb.c riscv: Fix "no previous prototype" compile warning in kgdb.c file 2020-07-09 20:09:30 -07:00
machine_kexec.c RISC-V Patches for the 5.14 Merge Window, Part 1 2021-07-09 10:36:29 -07:00
Makefile riscv: kexec: do not add '-mno-relax' flag if compiler doesn't support it 2021-08-12 07:16:52 -07:00
mcount-dyn.S riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT 2021-01-14 15:09:05 -08:00
mcount.S riscv: Workaround mcount name prior to clang-13 2021-04-26 08:25:01 -07:00
module-sections.c
module.c riscv: module: Create module allocations without exec permissions 2021-04-26 08:25:15 -07:00
patch.c riscv: Fixup compile error BUILD_BUG_ON failed 2021-01-14 15:09:01 -08:00
perf_callchain.c riscv: Make stack walk callback consistent with generic code 2020-11-20 18:53:38 -08:00
perf_event.c riscv: perf_event: Make some funciton static 2020-05-11 13:48:19 -07:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c riscv: Turn has_fpu into a static key if FPU=y 2021-05-25 22:56:57 -07:00
ptrace.c riscv: Ensure the value of FP registers in the core dump file is up to date 2021-08-24 20:54:10 -07:00
reset.c
riscv_ksyms.c riscv: provide memmove implementation 2020-12-10 17:27:54 -08:00
sbi.c RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
setup.c RISC-V Patches for the 5.15 Merge Window, Part 1 2021-09-05 11:31:23 -07:00
signal.c riscv: Turn has_fpu into a static key if FPU=y 2021-05-25 22:56:57 -07:00
smp.c RISC-V: Fix error code returned by riscv_hartid_to_cpuid() 2021-05-01 08:53:19 -07:00
smpboot.c sched/core: Initialize the idle task with preemption disabled 2021-05-12 13:01:45 +02:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: stacktrace: Fix NULL pointer dereference 2021-07-24 12:58:51 -07:00
sys_riscv.c RISC-V: Don't allow write+exec only page mapping request in mmap 2020-06-18 17:28:53 -07:00
syscall_table.c riscv: Constify sys_call_table 2021-04-26 08:25:09 -07:00
time.c RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
traps.c trap: cleanup trap_init() 2021-09-08 11:50:27 -07:00
traps_misaligned.c riscv: Unaligned load/store handling for M_MODE 2020-04-03 10:45:33 -07:00
vdso.c riscv: Mark some global variables __ro_after_init 2021-04-26 08:25:08 -07:00
vmlinux-xip.lds.S riscv: Move EXCEPTION_TABLE to RO_DATA segment 2021-09-10 23:59:48 -07:00
vmlinux.lds.S riscv: Move EXCEPTION_TABLE to RO_DATA segment 2021-09-10 23:59:48 -07:00