On 7/27/20 6:23 AM, Stephen Rothwell wrote:
> Hi all,
> 
> Changes since 20200724:
> 

on x86_64:

WARNING: unmet direct dependencies detected for DMA_ENGINE
  Depends on [n]: DMADEVICES [=n]
  Selected by [m]:
  - DRM_ZYNQMP_DPSUB [=m] && HAS_IOMEM [=y] && (ARCH_ZYNQMP || COMPILE_TEST [=y]) && COMMON_CLK [=y] && DRM [=m] && OF [=y]

and about 45 "undefined reference" build errors (here's a sample):

ld: drivers/misc/mic/scif/scif_dma.o: in function `scif_sync_dma.constprop.11':
scif_dma.c:(.text+0x672): undefined reference to `dma_sync_wait'
ld: drivers/spi/spi-bcm2835.o: in function `bcm2835_dma_release.isra.9':
spi-bcm2835.c:(.text+0xb34): undefined reference to `dma_release_channel'
ld: spi-bcm2835.c:(.text+0xc17): undefined reference to `dma_release_channel'
ld: drivers/spi/spi-bcm2835.o: in function `bcm2835_dma_init':
spi-bcm2835.c:(.text+0xd3c): undefined reference to `dma_request_chan'
ld: spi-bcm2835.c:(.text+0xd8b): undefined reference to `dma_request_chan'
ld: spi-bcm2835.c:(.text+0xf8a): undefined reference to `dma_get_slave_caps'
ld: spi-bcm2835.c:(.text+0x11d0): undefined reference to `dma_get_slave_caps'
ld: drivers/spi/spi-ep93xx.o: in function `ep93xx_spi_release_dma':
spi-ep93xx.c:(.text+0x1fc): undefined reference to `dma_release_channel'
ld: spi-ep93xx.c:(.text+0x220): undefined reference to `dma_release_channel'
ERROR: modpost: "dma_release_channel" [drivers/gpu/drm/xlnx/zynqmp-dpsub.ko] undefined!



I tried adding
	depends on DMADEVICES
to DRM_ZYNQMP_DPSUB

but that just gets into messy/ugly Kconfig
	error: recursive dependency detected!


BTW, adding
	select DMADEVICES
is not a good solution.  We try very hard not to enable entire
subsystems with one driver "select".  (No doubt you can find a
few examples that do just that, but it is strongly discouraged.)


Full randconfig file is attached.

thanks.
-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>