Re: [PATCH perf-tools-next v4 3/4] perf trace: Enhance BTF type formatting to symbolise kernel function pointers

[sashiko-bot@kernel.org]

> When BTF (BPF Type Format) metadata is loaded from vmlinux, 'perf trace'
> can inspect the precise C types of tracepoint and system call parameters.
> However, function pointer arguments are currently not recognised during
> BTF pretty-printing and default to hexadecimal output.
> 
> Introduce btf_is_func_ptr() to inspect BTF type hierarchies
> (i.e., traversing pointers, typedefs, and type modifiers) to determine
> whether a parameter resolves to a function prototype
> (BTF_KIND_FUNC_PROTO).
> 
> Generalise BTF type caching via syscall_arg_fmt__cache_btf_type() to
> handle structs, unions, enums, and function pointers alike. When a field
> is identified as a kernel function pointer, trace__btf_scnprintf()
> routes its value to syscall_arg__scnprintf_ksym(), enabling automatic
> zero-config symbolisation of kernel function pointers whenever BTF is
> available.
> 
> Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260821204930.679027-1-atomlin@atomlin.com?part=3