[RFC/RFT,0/5] Save single pages from CMA area

Message

Nicolin Chen March 26, 2019, 10:49 p.m. UTC

This series of patches try to save single pages from CMA area bypassing
all CMA single page alloctions and allocating normal pages instead, as
all addresses within one single page are contiguous.

We had once applied the PATCH-5 but reverted it as actually not all the
callers handled the fallback allocations. Per Robin's suggestion, let's
stuff alloc_pages()/free_page() fallbacks to those callers before having
PATCH-5.

Nicolin Chen (5):
  ARM: dma-mapping: Add fallback normal page allocations
  dma-remap: Run alloc_pages() on failure
  iommu: amd_iommu: Add fallback normal page allocations
  arm64: dma-mapping: Add fallback normal page allocations
  dma-contiguous: Do not allocate a single page from CMA area

 arch/arm/mm/dma-mapping.c   | 13 ++++++++++---
 arch/arm64/mm/dma-mapping.c | 19 ++++++++++++-------
 drivers/iommu/amd_iommu.c   |  3 +++
 kernel/dma/contiguous.c     | 22 +++++++++++++++++++---
 kernel/dma/remap.c          |  2 +-
 5 files changed, 45 insertions(+), 14 deletions(-)