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7baa509900
Iterator macros used to provide the arguments for step callbacks in a structure matching the flavour - iovec for ITER_IOVEC, kvec for ITER_KVEC and bio_vec for ITER_BVEC. That already broke down for ITER_XARRAY (bio_vec there); now that we are using kvec callback for bvec and xarray cases, we are always passing a pointer + length (void __user * + size_t for ITER_IOVEC callback, void * + size_t for everything else). Note that the original reason for bio_vec (page + offset + len) in case of ITER_BVEC used to be that we did *not* want to kmap a page when all we wanted was e.g. to find the alignment of its subrange. Now all such users are gone and the ones that are left want the page mapped anyway for actually copying the data. So in all cases we have pointer + length, and there's no good reason for keeping those in struct iovec or struct kvec - we can just pass them to callback separately. Again, less boilerplate in callbacks... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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.