* Is it needed to zero out the dma buffer for DMA_ATTR_NO_KERNEL_MAPPING
@ 2020-09-04 2:28 ` Hillf Danton
2020-09-04 9:10 ` Marek Szyprowski
0 siblings, 1 reply; 3+ messages in thread
From: Hillf Danton @ 2020-09-04 2:28 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Hillf Danton, Kees Cook, linux-kernel, linux-nvme,
James Bottomley, Matthew Wilcox, Marek Szyprowski
Hi Folks
Currently the DMA_ATTR_NO_KERNEL_MAPPING buffer allocated is not
cleared while dma core always zero it out for coherent allocations.
Is it making sense to do memset for the attr?
Thanks
Hillf
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Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Is it needed to zero out the dma buffer for DMA_ATTR_NO_KERNEL_MAPPING
2020-09-04 2:28 ` Is it needed to zero out the dma buffer for DMA_ATTR_NO_KERNEL_MAPPING Hillf Danton
@ 2020-09-04 9:10 ` Marek Szyprowski
0 siblings, 0 replies; 3+ messages in thread
From: Marek Szyprowski @ 2020-09-04 9:10 UTC (permalink / raw)
To: Hillf Danton, Christoph Hellwig
Cc: Kees Cook, linux-nvme, linux-kernel, James Bottomley, Matthew Wilcox
Hi
On 04.09.2020 04:28, Hillf Danton wrote:
> Currently the DMA_ATTR_NO_KERNEL_MAPPING buffer allocated is not
> cleared while dma core always zero it out for coherent allocations.
>
> Is it making sense to do memset for the attr?
If it is not cleared then this is a bug. Please propose a patch fixing
this issue.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Is it needed to zero out the dma buffer for DMA_ATTR_NO_KERNEL_MAPPING
@ 2020-09-04 9:10 ` Marek Szyprowski
0 siblings, 0 replies; 3+ messages in thread
From: Marek Szyprowski @ 2020-09-04 9:10 UTC (permalink / raw)
To: Hillf Danton, Christoph Hellwig
Cc: James Bottomley, Matthew Wilcox, Kees Cook, linux-nvme, linux-kernel
Hi
On 04.09.2020 04:28, Hillf Danton wrote:
> Currently the DMA_ATTR_NO_KERNEL_MAPPING buffer allocated is not
> cleared while dma core always zero it out for coherent allocations.
>
> Is it making sense to do memset for the attr?
If it is not cleared then this is a bug. Please propose a patch fixing
this issue.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-09-04 9:11 UTC | newest]
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2020-09-04 2:28 ` Is it needed to zero out the dma buffer for DMA_ATTR_NO_KERNEL_MAPPING Hillf Danton
2020-09-04 9:10 ` Marek Szyprowski
2020-09-04 9:10 ` Marek Szyprowski
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