Patch "kernfs: add stub helper for kernfs_generic_poll()" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    kernfs: add stub helper for kernfs_generic_poll()

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kernfs-add-stub-helper-for-kernfs_generic_poll.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 9362d42329c8b31ed4699a99b35dc34450f6948a
Author: Arnd Bergmann <arnd@xxxxxxxx>
Date:   Mon Jul 24 14:18:16 2023 +0200

    kernfs: add stub helper for kernfs_generic_poll()
    
    [ 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>

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,



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