Dear All,

The CMA related functions cma_alloc() and dma_alloc_from_contiguous() have gfp mask parameter, but sadly they only support __GFP_NOWARN flag. This gave their users a misleading feeling that any standard memory allocation flags are supported, what resulted in the security issue when caller have set __GFP_ZERO flag and expected the buffer to be cleared.

This patchset changes gfp_mask parameter to a simple boolean no_warn argument, which covers all the underlaying code supports.

This patchset is a result of the following discussion: https://patchwork.kernel.org/patch/10461919/

Best regards Marek Szyprowski Samsung R&D Institute Poland

Patch summary:

Marek Szyprowski (2): mm/cma: remove unsupported gfp_mask parameter from cma_alloc() dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous()

arch/arm/mm/dma-mapping.c | 5 +++-- arch/arm64/mm/dma-mapping.c | 4 ++-- arch/powerpc/kvm/book3s_hv_builtin.c | 2 +- arch/xtensa/kernel/pci-dma.c | 2 +- drivers/iommu/amd_iommu.c | 2 +- drivers/iommu/intel-iommu.c | 3 ++- drivers/s390/char/vmcp.c | 2 +- drivers/staging/android/ion/ion_cma_heap.c | 2 +- include/linux/cma.h | 2 +- include/linux/dma-contiguous.h | 4 ++-- kernel/dma/contiguous.c | 6 +++--- kernel/dma/direct.c | 3 ++- mm/cma.c | 8 ++++---- mm/cma_debug.c | 2 +- 14 files changed, 25 insertions(+), 22 deletions(-)