Re: [PATCH] selftests/mm: Add CONFIG_FTRACE to config

[Pedro Falcato <pfalcato@suse.de>]

On Wed, Jun 11, 2025 at 05:40:11PM +0530, Dev Jain wrote:
> If CONFIG_UPROBES is not set, a merge subtest fails:
> 
> Failure log:
> 
>   7151 12:46:54.627936  # # #  RUN           merge.handle_uprobe_upon_merged_vma ...
>   7152 12:46:54.639014  # # f /sys/bus/event_source/devices/uprobe/type
>   7153 12:46:54.639306  # # fopen: No such file or directory
>   7154 12:46:54.650451  # # # merge.c:473:handle_uprobe_upon_merged_vma:Expected read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type) (1) == 0 (0)
>   7155 12:46:54.650730  # # # handle_uprobe_upon_merged_vma: Test terminated by assertion
>   7156 12:46:54.661750  # # #          FAIL  merge.handle_uprobe_upon_merged_vma
>   7157 12:46:54.662030  # # not ok 8 merge.handle_uprobe_upon_merged_vma
> 
> CONFIG_UPROBES is enabled by CONFIG_UPROBE_EVENTS, which gets enabled by
> CONFIG_FTRACE. Therefore add this config to selftests/mm/config so that
> CI systems can include this config in the kernel build.

While I did consider this before sending my patch, not every architecture
supports uprobes :/ So this isn't a complete fix.

Also, does every architecture support ftrace? If not (and it does not seem so,
e.g there's an ARM variant that does not), I would guess this config fragment
blows up.

-- 
Pedro