lkml.org 
[lkml]   [2021]   [Oct]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/2] ftrace: make sure preemption disabled on recursion testing
Date
The testing show that perf_ftrace_function_call() are using
smp_processor_id() with preemption enabled, all the checking
on CPU could be wrong after preemption, PATCH 1/2 will fix
that.

Besides, as Peter point out, the testing of recursion within
the section between ftrace_test_recursion_trylock()/_unlock()
pair also need the preemption disabled as the documentation
explained, PATCH 2/2 will make sure on that.

Michael Wang (2):
ftrace: disable preemption on the testing of recursion
ftrace: prevent preemption in perf_ftrace_function_call()

arch/csky/kernel/probes/ftrace.c | 2 --
arch/parisc/kernel/ftrace.c | 2 --
arch/powerpc/kernel/kprobes-ftrace.c | 2 --
arch/riscv/kernel/probes/ftrace.c | 2 --
arch/x86/kernel/kprobes/ftrace.c | 2 --
include/linux/trace_recursion.h | 10 +++++++++-
kernel/livepatch/patch.c | 6 ------
kernel/trace/trace_event_perf.c | 17 +++++++++++++----
kernel/trace/trace_functions.c | 5 -----
9 files changed, 22 insertions(+), 26 deletions(-)

--
1.8.3.1

\
 
 \ /
  Last update: 2021-10-12 07:40    [W:0.358 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site