diff options
| author | Baoquan He <bhe@redhat.com> | 2023-07-07 21:58:52 +0800 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2023-07-10 08:48:35 -0600 |
| commit | 7e08baf6a89c8758050a3593aedc949f44fe3413 (patch) | |
| tree | 45f3a71ab5f3cf4b149fdbd54e9560046ac717a5 /drivers/of | |
| parent | 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5 (diff) | |
| download | linux-7e08baf6a89c8758050a3593aedc949f44fe3413.tar.gz | |
of: make OF_EARLY_FLATTREE depend on HAS_IOMEM
On s390 systems (aka mainframes), it has classic channel devices for
networking and permanent storage that are currently even more common
than PCI devices. Hence it could have a fully functional s390 kernel
with CONFIG_PCI=n, then the relevant iomem mapping functions
[including ioremap(), devm_ioremap(), etc.] are not available.
In LKP error report at below on s390:
------
ld: kernel/dma/coherent.o: in function `dma_init_coherent_memory':
coherent.c:(.text+0x102): undefined reference to `memremap'
ld: coherent.c:(.text+0x226): undefined reference to `memunmap'
ld: kernel/dma/coherent.o: in function `dma_declare_coherent_memory':
coherent.c:(.text+0x8b8): undefined reference to `memunmap'
ld: kernel/dma/coherent.o: in function `dma_release_coherent_memory':
coherent.c:(.text+0x9aa): undefined reference to `memunmap'
------
In the config file, several Kconfig options are:
------
'# CONFIG_PCI is not set'
CONFIG_OF_EARLY_FLATTREE=y
CONFIG_DMA_DECLARE_COHERENT=y
------
So, enabling OF_EARLY_FLATTREE will select DMA_DECLARE_COHERENT
and cause above building errors even though they are not needed
because CONFIG_PCI is disabled.
Here let OF_EARLY_FLATTREE depend on HAS_IOMEM so that it won't
be built to cause compiling error if PCI is unset.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202306211329.ticOJCSv-lkp@intel.com/
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org
Link: https://lore.kernel.org/r/20230707135852.24292-9-bhe@redhat.com
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index e40f10bf2ba4de..da9826accb1b5d 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -55,7 +55,7 @@ config OF_FLATTREE config OF_EARLY_FLATTREE bool - select DMA_DECLARE_COHERENT if HAS_DMA + select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM select OF_FLATTREE config OF_PROMTREE |