On Wed, Oct 14, 2020 at 12:48:42PM +0100, Paul Barker wrote:

Hi folks,

I'm seeing errors building perf with gcc 10 on the linux-5.4.y branch. The linker fails as the traceid_list symbol is defined in multiple compilation units. It looks like commit 168200b6d6ea0cb5765943ec5da5b8149701f36a ("perf cs-etm: Move definition of 'traceid_list' global variable from header file") was added to master to fix this but it's not been backported yet. Cherry-picking this commit locally fixed my build issues.

Looking at the Fixes tag in that commit, this should probably go into every stable branch from 4.16.y onwards which is still maintained.

See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

Let me know if you need more info.

Now queued up, but perf does not seem to be building on the 4.19.y tree at the moment, so I don't know how useful that will be there :)

thanks,

greg k-h