Christophe Leroy wrote:
Le 03/03/2022 à 17:59, Naveen N. Rao a écrit :
Christophe Leroy wrote:
The ability to disable ftrace in certain code paths through
paca_struct->ftrace_enabled will also be relevant on ppc32 - it will be
nice if it can be introduced there.
Ah ? I understood from commit ea678ac627e0 ("powerpc64/ftrace: Add a
field in paca to disable ftrace in unsafe code paths") that it was for
when it runs in real mode. PPC32 doesn't run any C code in real mode.
It likely isn't necessary in that case.
Are there any other situations that real_mode where we'd like to disable
it ? If so we could use the thread_struct as we don't have paca on PPC32.
For ppc64, we use this flag to disable certain paths in kvm, kexec,
mce/hmi and idle/hotplug. If none of those are problematic on ppc32,
then this isn't necessary.
Thanks,
- Naveen
