Re: [PATCH] sparc: iommu/pci_sun4v: fix page alignment in dma mapping

[Leon Romanovsky]

On Tue, Feb 17, 2026, at 19:16, John Paul Adrian Glaubitz wrote:
> Hi Stian,
>
> On Tue, 2026-02-17 at 17:48 +0100, Stian Halseth wrote:
>> Thanks for the review and suggestions.
>> 
>> On Tue, 2026-02-17 at 17:38 +0100, John Paul Adrian Glaubitz wrote:
>> > Hi Stian,
>> > 
>> > please rephrase the subject to:
>> > 
>> >  sparc: Fix page alignment in dma mapping
>> > 
>> > Your patch is not specific to sun4v but also fixes generic sparc
>> > code,
>> > so you should remove the part "iommu/pci_sun4v:" from the subject.
>> > 
>> Understood — I will update the patch subject as suggested.
>> > On Tue, 2026-02-17 at 17:21 +0100, stian@xxxxxx wrote:
>> > > From: Stian Halseth <stian@xxxxxx>
>> > > 
>> > > 'phys' may include an offset within the page, while 'base_paddr' is
>> > > already page-aligned.
>> > > 
>> > > This caused incorrect DMA mapping in dma_4u_map_phys and
>> > > dma_4v_map_phys.
>> > > 
>> > > Fix both functions by masking phys with IO_PAGE_MASK or subtracting
>> > > the page offset.
>> > 
>> > Please remove the newlines between your sentences, they're not
>> > necessary
>> > and also trim the lines at 80 columns.
>> 
>> Will do — I’ll reformat the commit message to 80-column lines
>> and remove extra newlines.
>
> Perfect! I have nothing to add. Let's have Andreas review your patch ;-).

Please add Fixes line, so the patch will be taken to stable@ in automatic way.

Thanks 

>
> Adrian
>
> -- 
>  .''`.  John Paul Adrian Glaubitz
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