bpf, arm64: Fix redundant MOV and clarify stack arg comments

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emit_stack_arg_store_imm() materializes the immediate into tmp and
then moves tmp to the target register (x5-x7).  Emit the immediate
directly into the target register to avoid the redundant MOV.

While here, qualify the bare "FP" in the stack-layout ASCII art as
"A64_FP" so it is not confused with BPF_FP, and note that incoming
stack arguments sit above the FP/LR pair pushed by the callee
prologue.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260528161750.1900674-2-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Puranjay Mohan 2026-05-28 09:17:47 -07:00 • committed by Alexei Starovoitov

parent 41300d032a

commit 12a585e607

1 changed files with 7 additions and 5 deletions

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arch/arm64/net/bpf_jit_comp.c

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