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59cc84c802
This reverts commit3c0468d445. That commit was breaking alignment guarantees for the DMA address when allocating coherent mappings, as described in Documentation/core-api/dma-api-howto.rst It was also noticed by Mellanox' driver: [ 1515.763621] mlx5_core c002:01:00.0: mlx5_frag_buf_alloc_node:146:(pid 13402): unexpected map alignment: 0x0800000000c61000, page_shift=16 [ 1515.763635] mlx5_core c002:01:00.0: mlx5_cqwq_create:181:(pid 13402): mlx5_frag_buf_alloc_node() failed, -12 Fixes:3c0468d445("powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs") Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210526144540.117795-1-fbarrat@linux.ibm.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.