Hi,
On Wed, 26 Nov 2025 at 12:31, Leo Yan leo.yan@arm.com wrote:
On Wed, Nov 26, 2025 at 12:11:05PM +0000, James Clark wrote:
[...]
This fix can still be applied to older kernels, but seems to me that now might be an appropriate time to consider removing the ETMv3 driver from the mainline kernel?
Yeah, if anyone is using it it would be on an old kernel surely?
We can confirm this in another way: if I don't miss anything, over the past several years (since 2017), we have not received any questions or bug reports based on hands-on practice regarding ETMv3 on the Coresight or perf mailing lists.
Thanks, Leo
The key to this is not the questions we are asked, but which platforms are still supported by the linux kernel.
The ETMv3 driver supports both ETMv3 and PTM trace (the programming model is the same, even if the trace decode is vastly different).
So as long as there are platforms supported that use either of those, we need to keep the driver in.
Mike