Re: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN in non-coherent DMA mode

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Subject: Re: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN in non-coherent DMA mode
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 13 Sep 2017 14:52:49 -0700
Cc: Fuxin Zhang <zhangfx@xxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
In-reply-to: <1505294451-21312-1-git-send-email-chenhc@lemote.com>

On Wed, 13 Sep 2017 17:20:51 +0800 Huacai Chen <chenhc@xxxxxxxxxx> wrote:

> In non-coherent DMA mode, kernel uses cache flushing operations to
> maintain I/O coherency, so the dmapool objects should be aligned to
> ARCH_DMA_MINALIGN.

What are the user-visible effects of this bug?

Follow-Ups:
- Re: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN innon-coherent DMA mode
  - From: 陈华才

References:
- [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN in non-coherent DMA mode
  - From: Huacai Chen

Prev by Date: + mm-oom_reaper-skip-mm-structs-with-mmu-notifiers.patch added to -mm tree
Next by Date: + mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode.patch added to -mm tree
Previous by thread: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN in non-coherent DMA mode
Next by thread: Re: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN innon-coherent DMA mode
Index(es):
- Date
- Thread

[Index of Archives] [Linux Kernel] [Kernel Development Newbies] [Linux USB Devel] [Video for Linux] [Linux Audio Users] [Yosemite Hiking] [Linux Kernel] [Linux SCSI]