It is generally considered bad style to enclose function prototypes in header files in #ifdef. This case illustrates why that is: The tegra host1x driver calls into the debugfs functions if CONFIG_DEBUG_FS is enabled, but that code is otherwise already discarded by the compiler, so leaving the prototype in place actually makes everything work.
drivers/gpu/host1x/drm/dc.c: In function 'tegra_dc_debugfs_init': drivers/gpu/host1x/drm/dc.c:1004:2: error: implicit declaration of function 'drm_debugfs_create_files' [-Werror=implicit-function-declaration] drivers/gpu/host1x/drm/dc.c: In function 'tegra_dc_debugfs_exit': drivers/gpu/host1x/drm/dc.c:1026:2: error: implicit declaration of function 'drm_debugfs_remove_files' [-Werror=implicit-function-declaration]
Signed-off-by: Arnd Bergmann arnd@arndb.de Cc: Ben Gamari bgamari@gmail.com Cc: Dave Airlie airlied@redhat.com
diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 63d17ee..8bc105e 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1551,7 +1551,7 @@ extern int drm_proc_init(struct drm_minor *minor, struct proc_dir_entry *root); extern int drm_proc_cleanup(struct drm_minor *minor, struct proc_dir_entry *root);
/* Debugfs support */ -#if defined(CONFIG_DEBUG_FS) + extern int drm_debugfs_init(struct drm_minor *minor, int minor_id, struct dentry *root); extern int drm_debugfs_create_files(struct drm_info_list *files, int count, @@ -1559,7 +1559,6 @@ extern int drm_debugfs_create_files(struct drm_info_list *files, int count, extern int drm_debugfs_remove_files(struct drm_info_list *files, int count, struct drm_minor *minor); extern int drm_debugfs_cleanup(struct drm_minor *minor); -#endif
/* Info file support */ extern int drm_name_info(struct seq_file *m, void *data);