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96c6aa4c63
Compute strongly connected components in the program CFG. Assign an SCC number to each instruction, recorded in env->insn_aux[*].scc. Use Tarjan's algorithm for SCC computation adapted to run non-recursively. For debug purposes print out computed SCCs as a part of full program dump in compute_live_registers() at log level 2, e.g.: func#0 @0 Live regs before insn: 0: .......... (b4) w6 = 10 2 1: ......6... (18) r1 = 0xffff88810bbb5565 2 3: .1....6... (b4) w2 = 2 2 4: .12...6... (85) call bpf_trace_printk#6 2 5: ......6... (04) w6 += -1 2 6: ......6... (56) if w6 != 0x0 goto pc-6 7: .......... (b4) w6 = 5 1 8: ......6... (18) r1 = 0xffff88810bbb5567 1 10: .1....6... (b4) w2 = 2 1 11: .12...6... (85) call bpf_trace_printk#6 1 12: ......6... (04) w6 += -1 1 13: ......6... (56) if w6 != 0x0 goto pc-6 14: .......... (b4) w0 = 0 15: 0......... (95) exit ^^^ SCC number for the instruction Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20250611200836.4135542-2-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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| kernel | ||
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| README | ||
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.