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

Stephen Rothwell
2021-11-01T08:42:33Z

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Hi all,

On Fri, 15 Oct 2021 20:26:48 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> 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

This has reappeared today. I don't know what happened to the drm-misc
tree over the weeked :-(

I have reapplied the above fix.
--
Cheers,
Stephen Rothwell

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