6.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
[ Upstream commit 79038a99445f69c5d28494dd4f8c6f0509f65b2e ]
In some randconfig builds, kernfs ends up being disabled, so there is no prototype
for kernfs_generic_poll()
In file included from kernel/sched/build_utility.c:97:
kernel/sched/psi.c:1479:3: error: implicit declaration of function 'kernfs_generic_poll' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
kernfs_generic_poll(t->of, wait);
^
Add a stub helper for it, as we have it for other kernfs functions.
Fixes: aff037078ecae ("sched/psi: use kernfs polling functions for PSI trigger polling")
Fixes: 147e1a97c4a0b ("fs: kernfs: add poll file operation")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230724121823.1357562-1-arnd@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/kernfs.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 73f5c120def88..2a36f3218b510 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -550,6 +550,10 @@ static inline int kernfs_setattr(struct kernfs_node *kn,
const struct iattr *iattr)
{ return -ENOSYS; }
+static inline __poll_t kernfs_generic_poll(struct kernfs_open_file *of,
+ struct poll_table_struct *pt)
+{ return -ENOSYS; }
+
static inline void kernfs_notify(struct kernfs_node *kn) { }
static inline int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
--
2.40.1
