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| author |   Paul Burton <paul.burton@mips.com> | 2019-02-04 13:52:58 -0800 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-02-04 13:58:07 -0800 |
| commit | 9ae1f262cd482f9ff28d179883f9e281d578e6ec (patch) | |
| tree | 96c41fc33e6a5363aa0a2550a107c33feb925030 /arch | |
| parent | MIPS: Enable hugepage support for MIPS64r6 (diff) | |
| download | linux-dev-9ae1f262cd482f9ff28d179883f9e281d578e6ec.tar.xz linux-dev-9ae1f262cd482f9ff28d179883f9e281d578e6ec.zip | |
MIPS: Don't select ARCH_HAS_SYNC_DMA_FOR_CPU when DMA is coherent
Commit f263f2a2c682 ("MIPS: Compile post DMA flush only when needed")
pushed the selection of ARCH_HAS_SYNC_DMA_FOR_CPU down to various
SYS_HAS_CPU_* Kconfig entries corresponding to CPUs for which
cpu_needs_post_dma_flush() might return true, but unfortunately missed
the fact that some of these CPUs can be used in configurations with
DMA_NONCOHERENT=n. When this is the case the kernel build does not
include our definition of arch_sync_dma_for_cpu() from
arch/mips/mm/dma-noncoherent.c and the build fails with a link error.
One example of this problem is ip27_defconfig:
kernel/dma/direct.o: In function `dma_direct_sync_single_for_cpu':
direct.c:(.text+0x6c): undefined reference to `arch_sync_dma_for_cpu'
kernel/dma/direct.o: In function `dma_direct_sync_sg_for_cpu':
direct.c:(.text+0x1f0): undefined reference to `arch_sync_dma_for_cpu'
kernel/dma/direct.o: In function `dma_direct_alloc':
direct.c:(.text+0xc20): undefined reference to `arch_dma_alloc'
kernel/dma/direct.o: In function `dma_direct_free':
direct.c:(.text+0xc3c): undefined reference to `arch_dma_free'
make[1]: *** [Makefile:1021: vmlinux] Error 1
make: *** [Makefile:152: sub-make] Error 2
Fix this by selecting ARCH_HAS_SYNC_DMA_FOR_CPU only when
DMA_NONCOHERENT is also selected. The SYS_HAS_CPU_BMIPS5000 case is left
as-is because systems with that CPU always select DMA_NONCOHERENT
anyway.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: f263f2a2c682 ("MIPS: Compile post DMA flush only when needed")
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/Kconfig | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index e9fbbfe65a45..6767a2104fcb 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1931,11 +1931,11 @@ config SYS_HAS_CPU_MIPS32_R3_5 config SYS_HAS_CPU_MIPS32_R5 bool - select ARCH_HAS_SYNC_DMA_FOR_CPU + select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT config SYS_HAS_CPU_MIPS32_R6 bool - select ARCH_HAS_SYNC_DMA_FOR_CPU + select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT config SYS_HAS_CPU_MIPS64_R1 bool @@ -1945,7 +1945,7 @@ config SYS_HAS_CPU_MIPS64_R2 config SYS_HAS_CPU_MIPS64_R6 bool - select ARCH_HAS_SYNC_DMA_FOR_CPU + select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT config SYS_HAS_CPU_R3000 bool @@ -1982,7 +1982,7 @@ config SYS_HAS_CPU_R8000 config SYS_HAS_CPU_R10000 bool - select ARCH_HAS_SYNC_DMA_FOR_CPU + select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT config SYS_HAS_CPU_RM7000 bool |