netdev - Re: [PATCH] dma-debug: hns_enet_drv could use more DMA entries

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Date:   Fri, 30 Nov 2018 12:04:47 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, Qian Cai <cai@....us>
Cc:     m.szyprowski@...sung.com, yisen.zhuang@...wei.com,
        salil.mehta@...wei.com, iommu@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-debug: hns_enet_drv could use more DMA entries

On 30/11/2018 08:42, Christoph Hellwig wrote:
> On Thu, Nov 29, 2018 at 10:54:56PM -0500, Qian Cai wrote:
>>   /* allow architectures to override this if absolutely required */
>>   #ifndef PREALLOC_DMA_DEBUG_ENTRIES
>> +/* amount of DMA mappings on this driver is huge. */
>> +#ifdef	HNS_ENET
>> +#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 17)
>> +#else
>>   #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
>>   #endif
>> +#endif
> 
> How would this be defined in a header that leaks into this file?

Apparently it wouldn't, because nothing defines that macro anywhere 
anyway. CONFIG_HNS_ENET, on the other hand, would be available by virtue 
of autoconf.h which is just about everywhere.

> I think we need to turn PREALLOC_DMA_DEBUG_ENTRIES into a user
> selectable config options, as I really don't want to collect hacks like
> this.

Agreed - we already have per-arch overrides scattered about, so growing 
special cases in yet another place just makes even more of a mess. 
Rounding all of it up into Kconfig would definitely make sense.

Robin.