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If the cache line size is greater than ARCH_DMA_MINALIGN (128), the warning shows and it's tainted as TAINT_CPU_OUT_OF_SPEC. However, it's not good because as discussed in the thread [1], the cpu cache line size will be problem only on non-coherent devices. Since the coherent flag is already introduced to struct device, show the warning only if the device is non-coherent device and ARCH_DMA_MINALIGN is smaller than the cpu cache size. [1] https://lore.kernel.org/linux-arm-kernel/20180514145703.celnlobzn3uh5tc2@localhost/ Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Tested-by: Zhang Lei <zhang.lei@jp.fujitsu.com> [catalin.marinas@arm.com: removed 'if' block for WARN_TAINT] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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.. | ||
cache.S | ||
context.c | ||
copypage.c | ||
dma-mapping.c | ||
dump.c | ||
extable.c | ||
fault.c | ||
flush.c | ||
hugetlbpage.c | ||
init.c | ||
ioremap.c | ||
kasan_init.c | ||
Makefile | ||
mmap.c | ||
mmu.c | ||
numa.c | ||
pageattr.c | ||
pgd.c | ||
physaddr.c | ||
proc.S | ||
ptdump_debugfs.c |