linux-kernel - Re: [RFC PATCH v2 0/7] dmaengine: enhance dmaengine to support DMA device hotplug

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Date:	Tue, 29 May 2012 17:49:39 +0900
From:	Taku Izumi <izumi.taku@...fujitsu.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Keping Chen <chenkeping@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [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@...il.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@...fujitsu.com>
> > 
> 
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