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This was achieved before by zero-ing out the source buffer and then copying the bytes into the destination buffer. This can also be done with memcpy_and_pad which will zero out only the destination buffer if its size is bigger than the size of the source buffer. This is already used in the same way in journal_transaction_name(). Moreover, zero-ing the source buffer was done twice, first in __bch2_fs_log_msg() and then in bch2_trans_log_msg(). And this method may also require allocating some extra memory for the source buffer. In conclusion, using memcpy_and_pad is better even tough the result is the same because it brings uniformity with what's already used in journal_transaction_name, it avoids code duplication and reallocating extra memory. Signed-off-by: Roxana Nicolescu <nicolescu.roxana@protonmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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 reStructuredText 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.