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Date:   Wed, 18 Oct 2023 08:24:39 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc:     x86@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, luto@kernel.org,
        peterz@infradead.org, kirill.shutemov@linux.intel.com,
        elena.reshetova@intel.com, isaku.yamahata@intel.com,
        seanjc@google.com, Michael Kelley <mikelley@microsoft.com>,
        thomas.lendacky@amd.com, decui@microsoft.com,
        sathyanarayanan.kuppuswamy@linux.intel.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>, iommu@lists.linux.dev
Subject: Re: [PATCH 06/10] dma: Use free_decrypted_pages()
Message-ID: <20231018062439.GA18260@lst.de>
References: <20231017202505.340906-1-rick.p.edgecombe@intel.com> <20231017202505.340906-7-rick.p.edgecombe@intel.com>
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On Tue, Oct 17, 2023 at 01:25:01PM -0700, Rick Edgecombe wrote:
>  struct cma;
>  
> @@ -165,7 +166,7 @@ static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
>  static inline void dma_free_contiguous(struct device *dev, struct page *page,
>  		size_t size)
>  {
> -	__free_pages(page, get_order(size));
> +	free_decrypted_pages((unsigned long)page_address(page), get_order(size));

CMA can be highmem, so this won't work totally independent of what
free_decrypted_pages actually does.  Also please avoid the overly long line.