linux-kernel - [PATCH 1/2] drm/exec: use unique instead of local label

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Message-Id: <20230731123625.3766-1-christian.koenig@amd.com>
Date:   Mon, 31 Jul 2023 14:36:24 +0200
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     boris.brezillon@...labora.com, ndesaulniers@...gle.com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        trix@...hat.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        naresh.kamboju@...aro.org, dakr@...hat.com
Subject: [PATCH 1/2] drm/exec: use unique instead of local label

GCC forbids to jump to labels in loop conditions and a new clang
check stumbled over this.

So instead using a local label inside the loop condition use an
unique label outside of it.

Fixes: commit 09593216bff1 ("drm: execution context for GEM buffers v7")
Link: https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
Link: https://github.com/ClangBuiltLinux/linux/issues/1890
Link: https://github.com/llvm/llvm-project/commit/20219106060208f0c2f5d096eb3aed7b712f5067
Reported-by: Nathan Chancellor <nathan@...nel.org>
Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
CC: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Christian König <christian.koenig@....com>
---
 include/drm/drm_exec.h | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/drm/drm_exec.h b/include/drm/drm_exec.h
index 73205afec162..e0462361adf9 100644
--- a/include/drm/drm_exec.h
+++ b/include/drm/drm_exec.h
@@ -3,6 +3,7 @@
 #ifndef __DRM_EXEC_H__
 #define __DRM_EXEC_H__
 
+#include <linux/compiler.h>
 #include <linux/ww_mutex.h>
 
 #define DRM_EXEC_INTERRUPTIBLE_WAIT	BIT(0)
@@ -74,13 +75,12 @@ struct drm_exec {
  * Since labels can't be defined local to the loops body we use a jump pointer
  * to make sure that the retry is only used from within the loops body.
  */
-#define drm_exec_until_all_locked(exec)				\
-	for (void *__drm_exec_retry_ptr; ({			\
-		__label__ __drm_exec_retry;			\
-__drm_exec_retry:						\
-		__drm_exec_retry_ptr = &&__drm_exec_retry;	\
-		(void)__drm_exec_retry_ptr;			\
-		drm_exec_cleanup(exec);				\
+#define drm_exec_until_all_locked(exec)					\
+__PASTE(__drm_exec_, __LINE__):						\
+	for (void *__drm_exec_retry_ptr; ({				\
+		__drm_exec_retry_ptr = &&__PASTE(__drm_exec_, __LINE__);\
+		(void)__drm_exec_retry_ptr;				\
+		drm_exec_cleanup(exec);					\
 	});)
 
 /**
-- 
2.34.1