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| Filename | Latest commit message | Latest commit date |
|---|---|---|
306b267cb3
Since ABI versioning info is kept separately from the code it's easy to
forget to update it while adding a new API.
Add simple verification that all global symbols exported with LIBBPF_API
are versioned in libbpf.map version script.
The idea is to check that number of global symbols in libbpf-in.o, that
is the input to the linker, matches with number of unique versioned
symbols in libbpf.so, that is the output of the linker. If these numbers
don't match, it may mean some symbol was not versioned and make will
fail.
"Unique" means that if a symbol is present in more than one version of
ABI due to ABI changes, it'll be counted once.
Another option to calculate number of global symbols in the "input"
could be to count number of LIBBPF_ABI entries in C headers but it seems
to be fragile.
Example of output when a symbol is missing in version script:
...
LD libbpf-in.o
LINK libbpf.a
LINK libbpf.so
Warning: Num of global symbols in libbpf-in.o (115) does NOT match
with num of versioned symbols in libbpf.so (114). Please make sure all
LIBBPF_API symbols are versioned in libbpf.map.
make: *** [check_abi] Error 1
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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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 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.