linux-kernel - [PATCH] drm/dp_mst: Fix build on systems with STACKTRACE

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Date:   Mon,  2 Dec 2019 05:36:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Lyude Paul <lyude@...hat.com>
Subject: [PATCH] drm/dp_mst: Fix build on systems with STACKTRACE_SUPPORT=n

On systems with STACKTRACE_SUPPORT=n, we get:

WARNING: unmet direct dependencies detected for STACKTRACE
  Depends on [n]: STACKTRACE_SUPPORT
  Selected by [y]:
  - STACKDEPOT [=y]

and build errors such as:

m68k-linux-ld: kernel/stacktrace.o: in function `stack_trace_save':
(.text+0x11c): undefined reference to `save_stack_trace'

Add the missing deendency on STACKTRACE_SUPPORT.

Fixes: 12a280c72868 ("drm/dp_mst: Add topology ref history tracking for debugging")
Cc: Lyude Paul <lyude@...hat.com>
Cc: Sean Paul <sean@...rly.run>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/gpu/drm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 1168351267fd..bfdadc3667e0 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -95,6 +95,7 @@ config DRM_KMS_FB_HELPER
 
 config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
         bool "Enable refcount backtrace history in the DP MST helpers"
+	depends on STACKTRACE_SUPPORT
         select STACKDEPOT
         depends on DRM_KMS_HELPER
         depends on DEBUG_KERNEL
-- 
2.17.1