[tip: sched/core] sched/psi: Select KERNFS as needed

[tip-bot2 for Randy Dunlap]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     98dfdd9ee93995a408192dbbf3dd219ba23e3738
Gitweb:        https://git.kernel.org/tip/98dfdd9ee93995a408192dbbf3dd219ba23e3738
Author:        Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
AuthorDate:    Sun, 30 Jul 2023 20:07:40 -07:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 02 Aug 2023 16:19:25 +02:00

sched/psi: Select KERNFS as needed

Users of KERNFS should select it to enforce its being built, so
do this to prevent a build error.

In file included from ../kernel/sched/build_utility.c:97:
../kernel/sched/psi.c: In function 'psi_trigger_poll':
../kernel/sched/psi.c:1479:17: error: implicit declaration of function 'kernfs_generic_poll' [-Werror=implicit-function-declaration]
 1479 |                 kernfs_generic_poll(t->of, wait);

Fixes: aff037078eca ("sched/psi: use kernfs polling functions for PSI trigger polling")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Link: lore.kernel.org/r/202307310732.r65EQFY0-lkp@xxxxxxxxx
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index f7f65af..5e7d488 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -629,6 +629,7 @@ config TASK_IO_ACCOUNTING
 
 config PSI
 	bool "Pressure stall information tracking"
+	select KERNFS
 	help
 	  Collect metrics that indicate how overcommitted the CPU, memory,
 	  and IO capacity are in the system.