Re: How to build lttng on RHEL 9?

Hi David,

RHEL kernels often backport a variety of changes. It is likely that 
lttng-modules needs to be updated for the exact kernel you're building 
for, which is usually just updating version range checks similar to this[1].

Based on your error message, I think the version range check that needs 
to be updated is here[2].

What's the exact version number of the kernel you're trying to build for?

thanks,
kienan

[1]: 
https://github.com/lttng/lttng-modules/commit/924b0ab5ad13570c4d4a305839684b37538064d7
[2]: 
https://github.com/lttng/lttng-modules/blob/b1a23b9733ce6217659bc5e62961d128794a2beb/src/lttng-statedump-impl.c#L389




On 1/19/26 11:00 AM, David Aldrich via lttng-dev wrote:
> Hi
> 
> I have a build error for lttng-modules-2.14.3 on RHEL 9.6:
> 
> lttng-modules-2.14.3/src/lttng-statedump-impl.c:408:20: error:
> ‘dev_base_lock’ undeclared (first use in this function); did you mean
> ‘device_lock’?
>    408 |         read_lock(&dev_base_lock);
>        |                    ^~~~~~~~~~~~~
> 
> Please can you advise me how to fix this?
> 
> (I am only building from source because I assume lttng packages aren't
> available for RHEL 9).
> 
> Thanks in advance
> David