diff options
| author | Philipp Rudo <prudo@linux.ibm.com> | 2020-04-06 14:47:48 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-04-22 16:20:55 +0200 |
| commit | 8ebf6da9db1b2a20bb86cc1bee2552e894d03308 (patch) | |
| tree | 5f29c829690f812c8690f40ebedcf53fb60aae27 /arch/s390/kernel/diag.c | |
| parent | ae83d0b416db002fe95601e7f97f64b59514d936 (diff) | |
s390/ftrace: fix potential crashes when switching tracers
Switching tracers include instruction patching. To prevent that a
instruction is patched while it's read the instruction patching is done
in stop_machine 'context'. This also means that any function called
during stop_machine must not be traced. Thus add 'notrace' to all
functions called within stop_machine.
Fixes: 1ec2772e0c3c ("s390/diag: add a statistic for diagnose calls")
Fixes: 38f2c691a4b3 ("s390: improve wait logic of stop_machine")
Fixes: 4ecf0a43e729 ("processor: get rid of cpu_relax_yield")
Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/diag.c')
| -rw-r--r-- | arch/s390/kernel/diag.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c index 61f2b0412345..ccba63aaeb47 100644 --- a/arch/s390/kernel/diag.c +++ b/arch/s390/kernel/diag.c @@ -133,7 +133,7 @@ void diag_stat_inc(enum diag_stat_enum nr) } EXPORT_SYMBOL(diag_stat_inc); -void diag_stat_inc_norecursion(enum diag_stat_enum nr) +void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) { this_cpu_inc(diag_stat.counter[nr]); trace_s390_diagnose_norecursion(diag_map[nr].code); |