linux-kernel - Re: [PATCH v3 5/5] iommu/s390: Fix incorrect pgsize

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Date:   Thu, 29 Sep 2022 12:59:02 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>, iommu@...ts.linux.dev,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, joro@...tes.org, will@...nel.org,
        robin.murphy@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] iommu/s390: Fix incorrect pgsize_bitmap

On Thu, Sep 29, 2022 at 05:33:02PM +0200, Niklas Schnelle wrote:
> The .pgsize_bitmap property of struct iommu_ops is not a page mask but
> rather has a bit set for each size of pages the IOMMU supports. As the
> comment correctly pointed out at this moment the code only support 4K
> pages so simply use SZ_4K here.
> 
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> ---
>  drivers/iommu/s390-iommu.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)

Yep!

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason