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Date:   Thu, 7 Apr 2022 06:26:44 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
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Subject: Re: [PATCH v9 05/11] iommu/dma: Introduce a helper to remove
 reserved regions
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References: <20220404124209.1086-1-shameerali.kolothum.thodi@huawei.com>
 <20220404124209.1086-6-shameerali.kolothum.thodi@huawei.com>
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>  
> +static inline void iommu_dma_put_resv_regions(struct device *dev, struct list_head *list)
> +{
> +}
> +
>  #endif	/* CONFIG_IOMMU_DMA */

This changes behavior when CONFIG_IOMMU_DMA is not set.  So e.g. on
ARM all the drivers that are using the new helper now fail to release
reserved regions.