Messages in this thread | | | Date | Fri, 1 Jul 2022 07:21:53 +1200 | Subject | Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS | From | Michael Schmitz <> |
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Hi Christoph,
On 29/06/22 18:21, Christoph Hellwig wrote: > On Wed, Jun 29, 2022 at 11:09:00AM +1200, Michael Schmitz wrote: >> And all SCSI buffers are allocated using kmalloc? No way at all for user >> space to pass unaligned data? > Most that you will see actually comes from the page allocator. But > the block layer has a dma_alignment limit, and when userspace sends > I/O that is not properly aligned it will be bounce buffered before > it it sent to the driver.
That limit is set to L1_CACHE_BYTES on m68k so we're good here.
Thanks,
Michael
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