On 11/26/2015 11:33 PM, Nabendu Maiti wrote:
On 11/18/2015 10:56 PM, Ville Syrjälä wrote:
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?
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.
Any comments? Please let me know if anything need to be done from my side.
(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
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