linux-kernel - [PATCH -mm 0/6] remove unnecessary sync_single_range_* in dma_map

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Date:	Tue, 27 Apr 2010 21:25:34 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	fujita.tomonori@....ntt.co.jp, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH -mm 0/6] remove unnecessary sync_single_range_* in dma_map_ops

This patchset removes useless sync_single_range_for_cpu and
sync_single_range_for_device hooks in dma_map_ops. These hooks were
for dma_sync_single_range_* DMA API, however, the API became obsolete
(the description in DMA API docs was removed too). Architecutres
should use sync_single_for_cpu and sync_single_for_device hooks
instead (as DMA API docs say, they need to support a partial sync).

We could remove dma_sync_single_range_* DMA API completely (no user in
-mm) but the API had been until 2.6.34-rc so I guess that it might be
better to leave it alone for some time.

The first patch is a bug fix and might be 2.6.34-rc material however
the API is not so popular (only net/b44.c uses) and we are already in
-rc5. I guess that it would be fine to merge it in the next merge
window.

=
 arch/ia64/kernel/pci-swiotlb.c           |    2 -
 arch/powerpc/kernel/dma-swiotlb.c        |    4 +-
 arch/powerpc/kernel/dma.c                |   12 +++++-----
 arch/x86/kernel/pci-swiotlb.c            |    2 -
 include/asm-generic/dma-mapping-common.h |   20 +-----------------
 include/linux/dma-mapping.h              |   10 ---------
 include/linux/swiotlb.h                  |   10 ---------
 lib/swiotlb.c                            |   31 ------------------------------
 8 files changed, 10 insertions(+), 81 deletions(-)

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