Re: [PATCH v2 6/8] dma-mapping: Support batch mode for dma_direct_{map,unmap}_sg

[Leon Romanovsky <leon@xxxxxxxxxx>]

On Sat, Dec 27, 2025 at 11:52:46AM +1300, Barry Song wrote:
> From: Barry Song <baohua@xxxxxxxxxx>
> 
> Leon suggested extending a flush argument to

Let's move this sentence out of the commit message and place it in the
changelog instead.

> dma_direct_unmap_phys(), dma_direct_map_phys(), and
> dma_direct_sync_single_for_cpu(). For single-buffer cases, this
> would use flush=true, while for SG cases flush=false would be
> used, followed by a single flush after all cache operations are
> issued in dma_direct_{map,unmap}_sg().
> 
> This ultimately benefits dma_map_sg() and dma_unmap_sg().
> 
> Cc: Leon Romanovsky <leon@xxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Ada Couprie Diaz <ada.coupriediaz@xxxxxxx>
> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
> Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Cc: Tangquan Zheng <zhengtangquan@xxxxxxxx>
> Signed-off-by: Barry Song <baohua@xxxxxxxxxx>
> ---
>  kernel/dma/direct.c  | 17 +++++++++++++----
>  kernel/dma/direct.h  | 16 ++++++++++------
>  kernel/dma/mapping.c |  6 +++---
>  3 files changed, 26 insertions(+), 13 deletions(-)

Thanks,
Reviewed-by: Leon Romanovsky <leon@xxxxxxxxxx>