linux-next: build failure after merge of the drm-misc tree

Stephen Rothwell
2021-10-15T09:26:55Z

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Hi all,

After merging the drm-misc tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

drivers/gpu/drm/drm_modeset_lock.c:111:29: error: conflicting types for '__stack_depot_save'
111 | static depot_stack_handle_t __stack_depot_save(void)
| ^~~~~~~~~~~~~~~~~~
In file included from include/linux/page_ext.h:7,
from include/linux/mm.h:25,
from include/linux/kallsyms.h:13,
from include/linux/bpf.h:20,
from include/linux/bpf-cgroup.h:5,
from include/linux/cgroup-defs.h:22,
from include/linux/cgroup.h:28,
from include/linux/memcontrol.h:13,
from include/linux/swap.h:9,
from include/linux/suspend.h:5,
from include/linux/regulator/consumer.h:35,
from include/linux/i2c.h:18,
from include/drm/drm_crtc.h:28,
from include/drm/drm_atomic.h:31,
from drivers/gpu/drm/drm_modeset_lock.c:24:
include/linux/stackdepot.h:18:22: note: previous declaration of '__stack_depot_save' was here
18 | depot_stack_handle_t __stack_depot_save(unsigned long *entries,
| ^~~~~~~~~~~~~~~~~~

Caused by commit

cd06ab2fd48f ("drm/locking: add backtrace for locking contended locks without backoff")

This may only have been revealed because of another fix I have had to
apply today.

I have applied the following patch for today.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 15 Oct 2021 20:17:52 +1100
Subject: [PATCH] drm/locking: fix for name conflict

Fixes: cd06ab2fd48f ("drm/locking: add backtrace for locking contended locks without backoff")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
drivers/gpu/drm/drm_modeset_lock.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 4d32b61fa1fd..ee36dd20900d 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -79,7 +79,7 @@
static DEFINE_WW_CLASS(crtc_ww_class);

#if IS_ENABLED(CONFIG_DRM_DEBUG_MODESET_LOCK)
-static noinline depot_stack_handle_t __stack_depot_save(void)
+static noinline depot_stack_handle_t __drm_stack_depot_save(void)
{
unsigned long entries[8];
unsigned int n;
@@ -108,7 +108,7 @@ static void __stack_depot_print(depot_stack_handle_t stack_depot)
kfree(buf);
}
#else /* CONFIG_DRM_DEBUG_MODESET_LOCK */
-static depot_stack_handle_t __stack_depot_save(void)
+static depot_stack_handle_t __drm_stack_depot_save(void)
{
return 0;
}
@@ -317,7 +317,7 @@ static inline int modeset_lock(struct drm_modeset_lock *lock,
ret = 0;
} else if (ret == -EDEADLK) {
ctx->contended = lock;
- ctx->stack_depot = __stack_depot_save();
+ ctx->stack_depot = __drm_stack_depot_save();
}

return ret;
--
2.33.0

--
Cheers,
Stephen Rothwell

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