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

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Message-ID: <87h7divcet.fsf@intel.com>
Date:   Fri, 15 Oct 2021 12:56:58 +0300
From:   Jani Nikula <jani.nikula@...el.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the drm-misc tree

On Fri, 15 Oct 2021, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 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@...b.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@...b.auug.org.au>

My bad, what was I thinking using stack depot's "namespace".

The fix looks good, but I'd rename __stack_depot_print too added in the
same commit. Do you want to respin or shall I take it from here?

Thanks,
Jani.



> ---
>  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

-- 
Jani Nikula, Intel Open Source Graphics Center