On Wed, Mar 18, 2020 at 5:58 PM Greg KH <gre...@linuxfoundation.org> wrote: > > On Wed, Mar 18, 2020 at 05:31:47PM +0100, Daniel Vetter wrote: > > On Wed, Mar 18, 2020 at 5:03 PM Wambui Karuga <wambui.karu...@gmail.com> > > wrote: > > > > > > > > > > > > On Wed, 18 Mar 2020, Daniel Vetter wrote: > > > > > > > On Tue, Mar 10, 2020 at 04:31:14PM +0300, Wambui Karuga wrote: > > > >> Since 987d65d01356 (drm: debugfs: make > > > >> drm_debugfs_create_files() never fail), drm_debugfs_create_files() > > > >> never > > > >> fails and should return void. Therefore, remove its use as the > > > >> return value of drm_vram_mm_debugfs_init(), and have the function > > > >> return 0 directly. > > > >> > > > >> v2: have drm_vram_mm_debugfs_init() return 0 instead of void to avoid > > > >> introducing build issues and build breakage. > > > >> > > > >> References: > > > >> https://lists.freedesktop.org/archives/dri-devel/2020-February/257183.html > > > >> Signed-off-by: Wambui Karuga <wambui.karu...@gmail.com> > > > >> Acked-by: Thomas Zimmermann <tzimmerm...@suse.de> > > > >> --- > > > >> drivers/gpu/drm/drm_gem_vram_helper.c | 10 ++++------ > > > >> 1 file changed, 4 insertions(+), 6 deletions(-) > > > >> > > > >> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c > > > >> b/drivers/gpu/drm/drm_gem_vram_helper.c > > > >> index 92a11bb42365..c8bcc8609650 100644 > > > >> --- a/drivers/gpu/drm/drm_gem_vram_helper.c > > > >> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c > > > >> @@ -1048,14 +1048,12 @@ static const struct drm_info_list > > > >> drm_vram_mm_debugfs_list[] = { > > > >> */ > > > >> int drm_vram_mm_debugfs_init(struct drm_minor *minor) > > > >> { > > > >> - int ret = 0; > > > >> - > > > >> #if defined(CONFIG_DEBUG_FS) > > > > > > > > Just noticed that this #if here is not needed, we already have a dummy > > > > function for that case. Care to write a quick patch to remove it? On top > > > > of this patch series here ofc, I'm in the processing of merging the > > > > entire > > > > pile. > > > > > > > > Thanks, Daniel > > > Hi Daniel, > > > Without this check here, and compiling without CONFIG_DEBUG_FS, this > > > function is run and the drm_debugfs_create_files() does not have access to > > > the parameters also protected by an #if above this function. So the change > > > throws an error for me. Is that correct? > > > > Hm right. Other drivers don't #ifdef out their debugfs file functions > > ... kinda a bit disappointing that we can't do this in the neatest way > > possible. > > > > Greg, has anyone ever suggested to convert the debugfs_create_file > > function (and similar things) to macros that don't use any of the > > arguments, and then also annotating all the static functions/tables as > > __maybe_unused and let the compiler garbage collect everything? > > Instead of explicit #ifdef in all the drivers ... > > No, no one has suggested that, having the functions be static inline > should make it all "just work" properly if debugfs is not enabled. The > variables will not be used, so the compiler should just optimize them > away properly. > > No checks for CONFIG_DEBUG_FS should be needed anywhere in .c code.
So the trouble with this one is that the static inline functions for the debugfs file are wrapped in a #if too, and hence if we drop the #if around the function call stuff won't compile. Should we drop all the #if in the .c file and assume the compiler will remove all the dead code and dead functions? -Daniel (who has no idea how this all works really) -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
