linux-kernel - Re: [PATCH 2/3] iommu/dma: Move public interfaces to linux/iommu.h

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Message-ID: <c64e838a-dace-73dd-8ab9-7284166cf742@arm.com>
Date:   Mon, 22 Aug 2022 13:55:11 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     joro@...tes.org, will@...nel.org, catalin.marinas@....com,
        jean-philippe@...aro.org, inki.dae@...sung.com,
        sw0312.kim@...sung.com, kyungmin.park@...sung.com,
        tglx@...utronix.de, maz@...nel.org, alex.williamson@...hat.com,
        cohuck@...hat.com, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 2/3] iommu/dma: Move public interfaces to linux/iommu.h

On 2022-08-22 12:21, Christoph Hellwig wrote:
>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>> index 70393fbb57ed..79cb6eb560a8 100644
>> --- a/include/linux/iommu.h
>> +++ b/include/linux/iommu.h
>> @@ -1059,4 +1059,40 @@ void iommu_debugfs_setup(void);
>>   static inline void iommu_debugfs_setup(void) {}
>>   #endif
>>   
>> +#ifdef CONFIG_IOMMU_DMA
>> +#include <linux/msi.h>
> 
> I don't think msi.h is actually needed here.
> 
> Just make the struct msi_desc and struct msi_msg forward declarations
> unconditional and we should be fine.

dma-iommu.c still needs to pick up msi.h for the actual definitions 
somehow, so it seemed logical to keep things the same shape as before. 
However I don't have a particularly strong preference either way.

Thanks,
Robin.