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Date: Fri, 13 Mar 2026 18:26:14 +0800
From: Xu Yilun <yilun.xu@linux.intel.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>, linux-coco@lists.linux.dev,
	linux-pci@vger.kernel.org, gregkh@linuxfoundation.org, aik@amd.com,
	bhelgaas@google.com, alistair23@gmail.com, lukas@wunner.de,
	jgg@nvidia.com, Thomas Gleixner <tglx@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
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	"H. Peter Anvin" <hpa@zytor.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v2 10/19] x86, swiotlb: Teach swiotlb to skip "accepted"
 devices
Message-ID: <abPmRsJ7cvLJ272k@yilunxu-OptiPlex-7050>
References: <20260303000207.1836586-1-dan.j.williams@intel.com>
 <20260303000207.1836586-11-dan.j.williams@intel.com>
 <yq5ah5qx9t77.fsf@kernel.org>
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In-Reply-To: <yq5ah5qx9t77.fsf@kernel.org>

> > @@ -365,6 +365,7 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
> >  
> >  	io_tlb_default_mem.force_bounce =
> >  		swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
> > +	io_tlb_default_mem.bounce_unaccepted = flags & SWIOTLB_UNACCEPTED;
> >
> 
> This should be.
> 
> @@ -373,7 +373,7 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
>  
>  	io_tlb_default_mem.force_bounce =
>  		swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
> -	io_tlb_default_mem.bounce_unaccepted = flags & SWIOTLB_UNACCEPTED;
> +	io_tlb_default_mem.bounce_unaccepted = !!(flags & SWIOTLB_UNACCEPTED);

Ah yes, I just realized assigning to a 1-bit field would truncate the
assigned value to its LSB...