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

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Message-ID: <4FC1070B.2040403@gmail.com>
Date:	Sun, 27 May 2012 00:38:35 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Taku Izumi <izumi.taku@...fujitsu.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

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