From: Arnd Bergmann arnd@arndb.de
mainline inclusion from mainline-v6.6-rc1 commit 79038a99445f69c5d28494dd4f8c6f0509f65b2e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7DHPO
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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@arndb.de Reviewed-by: Chengming Zhou zhouchengming@bytedance.com Link: https://lore.kernel.org/r/20230724121823.1357562-1-arnd@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lu Jialin lujialin4@huawei.com --- include/linux/kernfs.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h index 7240d00ace86..e2aa4910365d 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -510,6 +510,10 @@ 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,