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SubjectRe: [RFC PATCH v2 0/7] dmaengine: enhance dmaengine to support DMA device hotplug


On Sun, 27 May 2012 00:38:35 +0800
Jiang Liu <liuj97@gmail.com> wrote:

> Hi Taku,
> Sorry, forgot to export the percpu variable. Could you please
> help to test the patch below?
> Thanks!

Hi Jiang,

Thank you.
This patch can fix my build issue.

Best regards,
Taku Izumi


> ---
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index 8a41bdf..26316f6 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -73,6 +73,7 @@ static atomic_t dmaengine_dirty;
> static struct static_key dmaengine_quiesce = STATIC_KEY_INIT_FALSE;
> static DECLARE_WAIT_QUEUE_HEAD(dmaengine_wait_queue);
> DEFINE_PER_CPU(long, dmaengine_chan_ref_count);
> +EXPORT_PER_CPU_SYMBOL(dmaengine_chan_ref_count);
> #endif /* CONFIG_DMA_ENGINE_HOTPLUG */
>
> /* --- sysfs implementation --- */
>
> On 05/25/2012 08:49 AM, Taku Izumi wrote:
> > Hi Jiang,
> >
> > Build failed with "Device Drivers/DMA Engine Support/Async_tx: Offload
> > support for the async_tx api" enabled because of undefined symbol.
> > Patch 5/7 needs a fix?
> >
> > (snip)
> > CHK include/linux/version.h
> > CHK include/generated/utsrelease.h
> > CALL scripts/checksyscalls.sh
> > CHK include/generated/compile.h
> > CHK include/linux/version.h
> > make[2]: Nothing to be done for `all'.
> > Building modules, stage 2.
> > TEST posttest
> > MODPOST 2201 modules
> > Succeed: decoded and checked 1356146 instructions
> > TEST posttest
> > Success: decoded and checked 1000000 random instructions with 0 errors (seed:0x9432fb9e)
> > Kernel: arch/x86/boot/bzImage is ready (#13)
> > ERROR: "dmaengine_chan_ref_count" [crypto/async_tx/async_xor.ko] undefined!
> > ERROR: "dmaengine_chan_ref_count" [crypto/async_tx/async_raid6_recov.ko] undefined!
> > ERROR: "dmaengine_chan_ref_count" [crypto/async_tx/async_pq.ko] undefined!
> > ERROR: "dmaengine_chan_ref_count" [crypto/async_tx/async_memcpy.ko] undefined!
> > make[1]: *** [__modpost] Error 1
> > make: *** [modules] Error 2
> >
> > Best regards,
> > Taku Izumi <izumi.taku@jp.fujitsu.com>
> >
>
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