[PATCH] selftests/mm: Add CONFIG_FTRACE to config

[Dev Jain <dev.jain@arm.com>]

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.

Fixes: efe99fabeb11b ("selftests/mm: add test about uprobe pte be orphan during vma merge")
Reported-by: Aishwarya <aishwarya.tcv@arm.com>
Closes: https://lore.kernel.org/all/20250610103729.72440-1-aishwarya.tcv@arm.com/
Signed-off-by: Dev Jain <dev.jain@arm.com>
---
 tools/testing/selftests/mm/config | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config
index a28baa536332..e600b41030c1 100644
--- a/tools/testing/selftests/mm/config
+++ b/tools/testing/selftests/mm/config
@@ -8,3 +8,4 @@ CONFIG_GUP_TEST=y
 CONFIG_TRANSPARENT_HUGEPAGE=y
 CONFIG_MEM_SOFT_DIRTY=y
 CONFIG_ANON_VMA_NAME=y
+CONFIG_FTRACE=y
-- 
2.30.2