On Sun, Aug 23, 2020 at 11:21 PM Mittal, Anuj <[email protected]> wrote:
> On Sun, 2020-08-23 at 23:03 -0400, Bruce Ashfield wrote: > > > > > > On Sun, Aug 23, 2020 at 7:59 PM Mittal, Anuj <[email protected]> > > wrote: > > > On Sat, 2020-08-22 at 01:20 -0700, Khem Raj wrote: > > > > Hi Bruce > > > > > > > > On rv64 I am seeing an error while building lttng > > > > > > > > #error "LTTng-modules requires CONFIG_KPROBES on kernels >= > > > 5.7.0" > > > > > 20 | # error "LTTng-modules requires CONFIG_KPROBES on > > > kernels > > > > > >= 5.7.0" > > > > > | ^~~~~ > > > > > > > > I wonder if we need to update defconfig > > > > > > I see the same failure with linux-yocto-rt kernel as well. > > > > > > > -rt doesn't enable kprobes, so yes, with the latest lttng, it would > > trigger that issue. > > > > Traditionally -rt had issues with kprobes, but that is resolved now. > > Rather than adding the overhead, the enablement is still on demand > > for -rt. > > > > That being said, it looks like lttng has forced my hand, I just > > enabled the config by default in -rt and don't see any issues. > > > > I'll send a patch on Monday to fix it up. > > > Thanks Bruce. Should PREFERRRED_VERSION of linux-yocto-rt should also > be explicitly set like that of linux-yocto? I was wondering if there is > a specific reason why we don't set version for that kernel for qemu and > BSPs? > It's a distro decision, but there's no reason why we couldn't set that preferred version along with the standard kernel type. The folks that use rt tend to know what they want, so it hasn't popped up as a question in the past. Since -rt lags the first iterations of any new reference kernel, setting the preference to the known working version isn't a bad idea. At the moment 5.8-rt is a series of configuration changes, and not the -rt patch. Cheers, Bruce > > Thanks, > > Anuj > -- - Thou shalt not follow the NULL pointer, for chaos and madness await thee at its end - "Use the force Harry" - Gandalf, Star Trek II
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