Thanks to stubs for the NO_DMA=y case, drivers that use the DMA API can
be compile-tested on systems that do not support DMA. Hence the
dependency of BCM2835_VCHIQ on HAS_DMA was dropped to increase compile
coverage.
Unfortunately compilers became smarter, leading to new failures.
E.g. for a CONFIG_SUN3=y allmodconfig kernel with gcc 9.4.0:
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c: In function ‘free_pagelist’:
arch/m68k/include/asm/string.h:72:25: warning: argument 2 null where non-null expected [-Wnonnull]
72 | #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:614:4: note: in expansion of macro ‘memcpy’
614 | memcpy((char *)kmap(pages[0]) +
| ^~~~~~
arch/m68k/include/asm/string.h:72:25: note: in a call to built-in function ‘__builtin_memcpy’
72 | #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:614:4: note: in expansion of macro ‘memcpy’
614 | memcpy((char *)kmap(pages[0]) +
| ^~~~~~
This happens because the compiler can trace back the source pointer to a
allocation by dma_alloc_attrs(), which always returns NULL if NO_DMA=y.
Avoid this reinstating the dependency of the BCM2835_VCHIQ symbol on
HAS_DMA, and by restricting the selection of BCM2835_VCHIQ.
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
drivers/staging/vc04_services/Kconfig | 1 +
drivers/staging/vc04_services/bcm2835-audio/Kconfig | 2 +-
drivers/staging/vc04_services/bcm2835-camera/Kconfig | 4 ++--
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/vc04_services/Kconfig b/drivers/staging/vc04_services/Kconfig
index cb7c82403dbf22cb..31e58c9d1a110441 100644
--- a/drivers/staging/vc04_services/Kconfig
+++ b/drivers/staging/vc04_services/Kconfig
@@ -13,6 +13,7 @@ if BCM_VIDEOCORE
config BCM2835_VCHIQ
tristate "BCM2835 VCHIQ"
+ depends on HAS_DMA
imply VCHIQ_CDEV
help
Broadcom BCM2835 and similar SoCs have a VPU called VideoCore. This config
diff --git a/drivers/staging/vc04_services/bcm2835-audio/Kconfig b/drivers/staging/vc04_services/bcm2835-audio/Kconfig
index d32ea348e846f2c0..5a3a5279551eb702 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/Kconfig
+++ b/drivers/staging/vc04_services/bcm2835-audio/Kconfig
@@ -3,7 +3,7 @@ config SND_BCM2835
tristate "BCM2835 Audio"
depends on (ARCH_BCM2835 || COMPILE_TEST) && SND
select SND_PCM
- select BCM2835_VCHIQ
+ select BCM2835_VCHIQ if HAS_DMA
help
Say Y or M if you want to support BCM2835 built in audio
diff --git a/drivers/staging/vc04_services/bcm2835-camera/Kconfig b/drivers/staging/vc04_services/bcm2835-camera/Kconfig
index dcda565f9b38090f..870c9afb223a220b 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/Kconfig
+++ b/drivers/staging/vc04_services/bcm2835-camera/Kconfig
@@ -3,8 +3,8 @@ config VIDEO_BCM2835
tristate "BCM2835 Camera"
depends on MEDIA_SUPPORT
depends on VIDEO_DEV && (ARCH_BCM2835 || COMPILE_TEST)
- select BCM2835_VCHIQ
- select BCM2835_VCHIQ_MMAL
+ select BCM2835_VCHIQ if HAS_DMA
+ select BCM2835_VCHIQ_MMAL if HAS_DMA
select VIDEOBUF2_VMALLOC
select BTREE
help
--
2.25.1
