[PATCH] drm: ttm: select CONFIG_SHMEM

[Arnd Bergmann]

From: Arnd Bergmann <arnd at arndb.de>

ttm now directly calls into shmem code, which fails to build when
that is disabled at compile time.

ld.lld-21: error: undefined symbol: shmem_writeout
>>> referenced by ttm_backup.c
>>>               drivers/gpu/drm/ttm/ttm_backup.o:(ttm_backup_backup_page) in archive vmlinux.a

Select SHMEM here.

Fixes: fe75adffac33 ("ttm: Call shmem_writeout() from ttm_backup_backup_page()")
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
---
 drivers/gpu/drm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index b3bbb3f20b2a..831bd384f1fd 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -187,6 +187,7 @@ source "drivers/gpu/drm/display/Kconfig"
 config DRM_TTM
 	tristate
 	depends on DRM && MMU
+	select SHMEM
 	help
 	  GPU memory management subsystem for devices with multiple
 	  GPU memory types. Will be enabled automatically if a device driver
-- 
2.39.5