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    SubjectRe: [PATCH v2 06/26] lib/dma-noop: Only build dma_noop_ops for m32r and s390
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    On 01/12/2017 08:06 PM, Bart Van Assche wrote:
    > This was suggested by Christoph Hellwig.
    >
    > Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
    > Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    > Cc: Joerg Roedel <jroedel@suse.de>
    > Cc: Andy Lutomirski <luto@kernel.org>
    > Cc: Michael S. Tsirkin <mst@redhat.com>
    > Cc: Christoph Hellwig <hch@lst.de>

    Should be ok for s390 (as we do have ARCH_DMA_ADDR_T_64BIT).


    > ---
    > arch/m32r/Kconfig | 1 +
    > arch/s390/Kconfig | 1 +
    > lib/Kconfig | 5 +++++
    > lib/Makefile | 2 +-
    > 4 files changed, 8 insertions(+), 1 deletion(-)
    >
    > diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
    > index d227a6988d6b..95474460b367 100644
    > --- a/arch/m32r/Kconfig
    > +++ b/arch/m32r/Kconfig
    > @@ -18,6 +18,7 @@ config M32R
    > select MODULES_USE_ELF_RELA
    > select HAVE_DEBUG_STACKOVERFLOW
    > select CPU_NO_EFFICIENT_FFS
    > + select DMA_NOOP_OPS
    >
    > config SBUS
    > bool
    > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
    > index c6722112527d..38ad42358c41 100644
    > --- a/arch/s390/Kconfig
    > +++ b/arch/s390/Kconfig
    > @@ -137,6 +137,7 @@ config S390
    > select HAVE_DEBUG_KMEMLEAK
    > select HAVE_DMA_API_DEBUG
    > select HAVE_DMA_CONTIGUOUS
    > + select DMA_NOOP_OPS
    > select HAVE_DYNAMIC_FTRACE
    > select HAVE_DYNAMIC_FTRACE_WITH_REGS
    > select HAVE_EFFICIENT_UNALIGNED_ACCESS
    > diff --git a/lib/Kconfig b/lib/Kconfig
    > index 260a80e313b9..b6baf0609e8b 100644
    > --- a/lib/Kconfig
    > +++ b/lib/Kconfig
    > @@ -395,6 +395,11 @@ config HAS_DMA
    > depends on !NO_DMA
    > default y
    >
    > +config DMA_NOOP_OPS
    > + bool
    > + depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
    > + default n
    > +
    > config CHECK_SIGNATURE
    > bool
    >
    > diff --git a/lib/Makefile b/lib/Makefile
    > index bc4073a8cd08..ada06d5652e8 100644
    > --- a/lib/Makefile
    > +++ b/lib/Makefile
    > @@ -26,7 +26,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
    >
    > lib-$(CONFIG_MMU) += ioremap.o
    > lib-$(CONFIG_SMP) += cpumask.o
    > -lib-$(CONFIG_HAS_DMA) += dma-noop.o
    > +lib-$(CONFIG_DMA_NOOP_OPS) += dma-noop.o
    >
    > lib-y += kobject.o klist.o
    > obj-y += lockref.o
    >

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