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Yonghong Song says: ==================== With latest llvm, bpf selftest test_progs, which has +alu32 enabled, failed for strobemeta.o and a few other subtests. The reason is due to that verifier did not provide better var_off.mask after jmp32 instructions. This patch set addressed this issue and after the fix, test_progs passed with alu32. Patch #1 provided detailed explanation of the problem and the fix. Patch #2 added three tests in test_verifier. Changelog: v1 -> v2: - do not directly manipulate tnum.{value,mask} in __reg_bound_offset32(), using tnum_lshift/tnum_rshift functions instead - do __reg_bound_offset32() after regular 64bit __reg_bound_offset() since the latter may give a better upper 32bit var_off, which can be inherited by __reg_bound_offset32(). ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.