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bpf, docs: Clarify call local offset

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In the Jump instructions section it explains that the offset is
"relative to the instruction following the jump instruction".
But the program-local section confusingly said "referenced by
offset from the call instruction, similar to JA".

This patch updates that sentence with consistent wording, saying
it's relative to the instruction following the call instruction.

Signed-off-by: Dave Thaler <dthaler1968@gmail.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240525153332.21355-1-dthaler1968@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dave Thaler 2024-05-25 08:33:32 -07:00 committed by Alexei Starovoitov
parent 6a6d8b6f00
commit f980f13e4e
1 changed files with 4 additions and 3 deletions
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7
Documentation/bpf/standardization/instruction-set.rst
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@ -552,9 +552,10 @@ is outside the scope of this document and is left for future work.
Program-local functions
~~~~~~~~~~~~~~~~~~~~~~~
Program-local functions are functions exposed by the same BPF program as the
caller, and are referenced by offset from the call instruction, similar to
``JA``. The offset is encoded in the 'imm' field of the call instruction.
An ``EXIT`` within the program-local function will return to the caller.
caller, and are referenced by offset from the instruction following the call
instruction, similar to ``JA``. The offset is encoded in the 'imm' field of
the call instruction. An ``EXIT`` within the program-local function will
return to the caller.
Load and store instructions
===========================