[0/2] Refactor dummy DMA ops

Message

Robin Murphy Dec. 7, 2018, 4:31 p.m. UTC

Hi all,

Tangential to Christoph's RFC for mitigating indirect call overhead in
common DMA mapping scenarios[1], this is a little reshuffle to prevent the
CONFIG_ACPI_CCA_REQUIRED case from getting in the way. This would best go
via the dma-mapping tree, so reviews and acks welcome.

Robin.

[1] https://lore.kernel.org/lkml/[e-mail]/

Robin Murphy (2):
  dma-mapping: Factor out dummy DMA ops
  ACPI / scan: Refactor _CCA enforcement

 arch/arm64/include/asm/dma-mapping.h |  4 +-
 arch/arm64/mm/dma-mapping.c          | 92 ----------------------------
 drivers/acpi/scan.c                  |  5 ++
 drivers/base/platform.c              |  3 +-
 drivers/pci/pci-driver.c             |  3 +-
 include/linux/dma-mapping.h          |  1 +
 kernel/dma/mapping.c                 | 54 ++++++++++++++++
 7 files changed, 63 insertions(+), 99 deletions(-)

Comments

Christoph Hellwig Dec. 7, 2018, 5:05 p.m. UTC | #1

So I'd really prefer if we had a separate dummy.c file, like in
my take on your previous patch here:

http://git.infradead.org/users/hch/misc.git/commitdiff/e01adddc1733fa414dc16cd22e8f58be9b64a025

http://git.infradead.org/users/hch/misc.git/commitdiff/596bde76e5944a3f4beb8c2769067ca88dda127a

Otherwise this looks fine.  If you don't minde I'll take your patches,
apply the move to a separate file and merge it into the above tree.

Robin Murphy Dec. 7, 2018, 5:35 p.m. UTC | #2

On 07/12/2018 17:05, Christoph Hellwig wrote:
> So I'd really prefer if we had a separate dummy.c file, like in
> my take on your previous patch here:
> 
> http://git.infradead.org/users/hch/misc.git/commitdiff/e01adddc1733fa414dc16cd22e8f58be9b64a025
> 
> http://git.infradead.org/users/hch/misc.git/commitdiff/596bde76e5944a3f4beb8c2769067ca88dda127a
> 
> Otherwise this looks fine.  If you don't minde I'll take your patches,
> apply the move to a separate file and merge it into the above tree.

Sure - TBH I did consider creating a separate file, but then didn't for 
mysterious reasons that don't stand up to scrutiny. If you're happy to 
do the fixup on top that's fine by me (if culling .map_resource was 
intentional, please scrub the last bit of the commit message to match).

I'll make the equivalent change locally anyway just in case there's any 
other cause to resend.

Robin.