On 11/18/2015 10:56 PM, Ville Syrjälä wrote:
I am using it for platform level debug symbol inclusion in elf which are excluded in Os/O2 . We need it.Else it will break generic kernel.On Wed, Nov 18, 2015 at 10:33:55PM +0530, Maiti, Nabendu Bikash wrote:On 11/18/2015 7:00 PM, Ville Syrjälä wrote:On Wed, Nov 18, 2015 at 06:48:37PM +0530, Maiti, Nabendu Bikash wrote:On 11/18/2015 6:22 PM, Ville Syrjälä wrote:On Wed, Nov 18, 2015 at 12:19:06PM +0000, Chris Wilson wrote:On Wed, Nov 18, 2015 at 05:43:52PM +0530, Nabendu Maiti wrote:Uninitialized variables (width, Height) in intel_check_sprite_plane leads to compilererror in O1 level. Initialize all declared variables to fix this issue. Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti@xxxxxxxxx>Or perhaps: diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c index 2b96f336589e..8d7b4eb5b5b9 100644 --- a/drivers/gpu/drm/i915/intel_sprite.c +++ b/drivers/gpu/drm/i915/intel_sprite.c @@ -747,7 +747,6 @@ intel_check_sprite_plane(struct drm_plane *plane, struct drm_framebuffer *fb = state->base.fb; int crtc_x, crtc_y; unsigned int crtc_w, crtc_h; - uint32_t src_x, src_y, src_w, src_h; struct drm_rect *src = &state->src; struct drm_rect *dst = &state->dst; const struct drm_rect *clip = &state->clip; @@ -813,6 +812,8 @@ intel_check_sprite_plane(struct drm_plane *plane, crtc_h = drm_rect_height(dst);if (state->visible) {+ u32 src_x, src_y, src_w, src_h; + /* check again in case clipping clamped the results */ hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale); if (hscale < 0) { @@ -871,10 +872,9 @@ intel_check_sprite_plane(struct drm_plane *plane, if (crtc_w == 0) state->visible = false; } - }/* Check size restrictions when scaling */- if (state->visible && (src_w != crtc_w || src_h != crtc_h)) { + if (src_w != crtc_w || src_h != crtc_h) {That would change what it does.yes, checked the code where inside each if condition loop we may be changing the state->visible var itself. Next condition check it may be false too. The place giving compiler error src->x1 = src_x << 16; src->x2 = (src_x + src_w) << 16; src->y1 = src_y << 16; src->y2 = (src_y + src_h) << 16; Then just one line change of initializing the variables is better?Or maybe fix your compiler instead? I don't get any warning/errors from this. What version of gcc are you using?I still get the warning and error if -Werror is enabled, And on Makefile O1 optimization is enabled.And why exactly are you building with -O1?
(note on Android build by default Werror is enabled and gcc-- GCC: (GNU) 4.9.2 ) on generic build, gcc --gcc (Ubuntu 4.9.3-5ubuntu1~14.04) 4.9.3 following are the error.. CC drivers/staging/android/timed_gpio.o /home/nbikash/PROJ_CODEBASE/MDsrt_WW44.2/kernel/bxt/drivers/gpu/drm/i915/intel_sprite.c: In function 'intel_check_sprite_plane': /home/nbikash/PROJ_CODEBASE/MDsrt_WW44.2/kernel/bxt/drivers/gpu/drm/i915/intel_sprite.c:1241:20: error: 'src_h' may be used uninitialized in this function [-Werror=maybe-uninitialized] src->y2 = (src_y + src_h) << 16; ^ /home/nbikash/PROJ_CODEBASE/MDsrt_WW44.2/kernel/bxt/drivers/gpu/drm/i915/intel_sprite.c:1239:20: error: 'src_w' may be used uninitialized in this function [-Werror=maybe-uninitialized] src->x2 = (src_x + src_w) << 16; ^ /home/nbikash/PROJ_CODEBASE/MDsrt_WW44.2/kernel/bxt/drivers/gpu/drm/i915/intel_sprite.c:1241:20: error: 'src_y' may be used uninitialized in this function [-Werror=maybe-uninitialized] src->y2 = (src_y + src_h) << 16; ^ /home/nbikash/PROJ_CODEBASE/MDsrt_WW44.2/kernel/bxt/drivers/gpu/drm/i915/intel_sprite.c:1238:19: error: 'src_x' may be used uninitialized in this function [-Werror=maybe-uninitialized] src->x1 = src_x << 16;unsigned int width_bytes;WARN_ON(!can_scale);@@ -898,7 +898,6 @@ intel_check_sprite_plane(struct drm_plane *plane, } }- if (state->visible) {src->x1 = src_x << 16; src->x2 = (src_x + src_w) << 16; src->y1 = src_y << 16; And make both the compiler and reader happier -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
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