linux-kernel - Re: [PATCH bpf-next v11 2/3] cfi: Move BPF CFI types and helpers to generic code

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Message-ID: <aH5PypjBVdzVxxlo@willie-the-truck>
Date: Mon, 21 Jul 2025 15:33:46 +0100
From: Will Deacon <will@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: bpf@...r.kernel.org, Puranjay Mohan <puranjay@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Maxwell Bland <mbland@...orola.com>
Subject: Re: [PATCH bpf-next v11 2/3] cfi: Move BPF CFI types and helpers to
 generic code

On Fri, Jul 18, 2025 at 10:33:48PM +0000, Sami Tolvanen wrote:
> Instead of duplicating the same code for each architecture, move
> the CFI type hash variables for BPF function types and related
> helper functions to generic CFI code, and allow architectures to
> override the function definitions if needed.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---
>  arch/riscv/include/asm/cfi.h  | 16 ------------
>  arch/riscv/kernel/cfi.c       | 24 ------------------
>  arch/x86/include/asm/cfi.h    | 10 ++------
>  arch/x86/kernel/alternative.c | 12 ---------
>  include/linux/cfi.h           | 47 +++++++++++++++++++++++++++++------
>  kernel/cfi.c                  | 15 +++++++++++
>  6 files changed, 56 insertions(+), 68 deletions(-)

Thanks, Sami, I like the look of this now.

If you can get the kbuild robot on board too, then I think we're good to
go!

Will