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24ff0347bb
For 8-bit and 16-bit sign-extention mov instructions, it can use the native instructions ext.w.b and ext.w.h directly, no need to use the temporary t1 register, just remove the redundant operations. Here are the test results: # modprobe test_bpf test_range=81,84 # dmesg -t | tail -5 test_bpf: #81 ALU_MOVSX | BPF_B jited:1 5 PASS test_bpf: #82 ALU_MOVSX | BPF_H jited:1 5 PASS test_bpf: #83 ALU64_MOVSX | BPF_B jited:1 5 PASS test_bpf: #84 ALU64_MOVSX | BPF_H jited:1 5 PASS test_bpf: Summary: 4 PASSED, 0 FAILED, [4/4 JIT'ed] Acked-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> |
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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 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.