ff3f786079
When UML is compiled under 32-bit x86, it uses its own copy of
checksum_32.S, which is terribly out-of-date and doesn't support
checksumming unaligned data.
This causes the new "checksum" KUnit test to fail:
./tools/testing/kunit/kunit.py run --kconfig_add CONFIG_64BIT=n --cross_compile i686-linux-gnu- checksum
KTAP version 1
# Subtest: checksum
1..3
# test_csum_fixed_random_inputs: ASSERTION FAILED at lib/checksum_kunit.c:243
Expected result == expec, but
result == 33316 (0x8224)
expec == 33488 (0x82d0)
not ok 1 test_csum_fixed_random_inputs
# test_csum_all_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:267
Expected result == expec, but
result == 65280 (0xff00)
expec == 0 (0x0)
not ok 2 test_csum_all_carry_inputs
# test_csum_no_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:306
Expected result == expec, but
result == 65531 (0xfffb)
expec == 0 (0x0)
not ok 3 test_csum_no_carry_inputs
Sharing the normal implementation in arch/x86/lib both fixes all of
these issues and means any further fixes only need to be done once.
x86_64 already seems to share the same implementation between UML and
"normal" x86.
Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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.