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9a002d531b
btrfsic_read_block() (which calls kmap()) and btrfsic_release_block_ctx() (which calls kunmap()) are always called within a single thread of execution. Therefore the mappings created within these calls can be a thread local mapping. Convert the kmap() of bloc_ctx->pagev to kmap_local_page(). Luckily the unmap loops backwards through the array pointer so no adjustment needs to be made to the unmapping order. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.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.