Re: [linux-cip:linux-4.19.y-cip 7/17] drivers/gpu/drm/drm_atomic.c:1264:1: warning: no previous prototype for 'drm_atomic_get_old_private_obj_state'


Pavel Machek
 

Hi!

I have received a warning message mail from Kernel test robot. I have investigated this issue and found there were lots of warnings with architecture by following the steps mentioned in this mail.

Then I investigated this particular issue and found that issue is caused by bad commit done by me while backporting. The below backport commit has
extra functions from patch1(0001-drm-Add-drm_atomic_get_old-new_private_obj_state.patch), but the corresponding header is missing.

cip commit: cacc2a81b9872aa8830353110b1252021f124ae8
upstream commit: 1b27fbdde1df172dba604855c45078d741f8c858

I have attached 3 patches, that looks like fixes the issue mentioned by kernel robot.

How do we proceed here?
drop cip commit: cacc2a81b9872aa8830353110b1252021f124ae8 and apply the 3 patches to fix this issue?
No, let's not revert anything.

This is trivial fix for first issue, make it into patch:

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index c0b48e25a620..9042fdae9211 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -402,6 +402,12 @@ void drm_atomic_private_obj_fini(struct drm_private_obj *obj);
struct drm_private_state * __must_check
drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
struct drm_private_obj *obj);
+struct drm_private_state *
+drm_atomic_get_old_private_obj_state(struct drm_atomic_state *state,
+ struct drm_private_obj *obj);
+struct drm_private_state *
+drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
+ struct drm_private_obj *obj);

struct drm_connector *
drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state
*state,

And this is somehow strange / non-trivial thingie. Make it into second
patch, and maybe try to explain what is going on there.

Best regards,
Pavel

@@ -656,6 +662,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->connectors[__i].ptr && \
((connector) = (__state)->connectors[__i].ptr, \
+ (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
(old_connector_state) = (__state)->connectors[__i].old_state, \
(new_connector_state) = (__state)->connectors[__i].new_state, 1))

@@ -677,6 +684,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->connectors[__i].ptr && \
((connector) = (__state)->connectors[__i].ptr, \
+ (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
(old_connector_state) = (__state)->connectors[__i].old_state, 1))

/**
@@ -697,7 +705,9 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->connectors[__i].ptr && \
((connector) = (__state)->connectors[__i].ptr, \
- (new_connector_state) = (__state)->connectors[__i].new_state, 1))
+ (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
+ (new_connector_state) = (__state)->connectors[__i].new_state, \
+ (void)(new_connector_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
* for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
@@ -717,7 +727,9 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->crtcs[__i].ptr && \
((crtc) = (__state)->crtcs[__i].ptr, \
+ (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
(old_crtc_state) = (__state)->crtcs[__i].old_state, \
+ (void)(old_crtc_state) /* Only to avoid unused-but-set-variable warning */, \
(new_crtc_state) = (__state)->crtcs[__i].new_state, 1))

/**
@@ -756,7 +768,9 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->crtcs[__i].ptr && \
((crtc) = (__state)->crtcs[__i].ptr, \
- (new_crtc_state) = (__state)->crtcs[__i].new_state, 1))
+ (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
+ (new_crtc_state) = (__state)->crtcs[__i].new_state, \
+ (void)(new_crtc_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
* for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
@@ -776,6 +790,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->planes[__i].ptr && \
((plane) = (__state)->planes[__i].ptr, \
+ (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
(old_plane_state) = (__state)->planes[__i].old_state,\
(new_plane_state) = (__state)->planes[__i].new_state, 1))

@@ -836,7 +851,9 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if ((__state)->planes[__i].ptr && \
((plane) = (__state)->planes[__i].ptr, \
- (new_plane_state) = (__state)->planes[__i].new_state, 1))
+ (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
+ (new_plane_state) = (__state)->planes[__i].new_state, \
+ (void)(new_plane_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
* for_each_oldnew_private_obj_in_state - iterate over all private objects in an atomic update



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