mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-01-23 01:09:21 -05:00
3c40841cdc
An fsstress task on a big endian system (s390x) quickly produces a bunch of CRC errors in the system logs. Most of these are related to the narrow CRCs path, but the fundamental problem can be reduced to a single write and re-read (after dropping caches) of a previously merged extent. The key merge path that handles extent merges eventually calls into bch2_checksum_merge() to combine the CRCs of the associated extents. This code attempts to avoid a byte order swap by feeding the le64 values into the crc32c code, but the latter casts the resulting u64 value down to a u32, which truncates the high bytes where the actual crc value ends up. This results in a CRC value that does not change (since it is merged with a CRC of 0), and checksum failures ensue. Fix the checksum merge code to swap to cpu byte order on the boundaries to the external crc code such that any value casting is handled properly. Signed-off-by: Brian Foster <bfoster@redhat.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 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.