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Sun, 27 Sep 2026 13:32:13 -0700 (PDT) Date: Mon, 28 Sep 2026 04:32:07 +0800 From: Kuan-Wei Chiu To: Geert Uytterhoeven Cc: ast@kernel.org, Greg Ungerer , daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, jserv@ccns.ncku.edu.tw, marscheng@google.com, eleanor15x@gmail.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, bpf@vger.kernel.org, Daniel Palmer Subject: Re: [PATCH bpf-next v5] m68k, bpf: Add initial BPF JIT compiler support Message-ID: References: <20260823163812.3024812-1-visitorckw@gmail.com> Precedence: bulk X-Mailing-List: linux-m68k@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sun, Sep 27, 2026 at 04:03:15PM +0200, Geert Uytterhoeven wrote: > Hi Kuan-Wei, > > On Fri, 28 Aug 2026 at 12:50, Greg Ungerer wrote: > > On 24/8/26 02:38, Kuan-Wei Chiu wrote: > > > Add a BPF JIT compiler for the m68k architecture. > > > > > > The JIT generates m68k machine code targeting m68020+ processors and > > > coldfire parts with an mmu (ISA_B/ISA_C). It excludes plain 68000/68010 > > > and non-mmu coldfire processors, as it relies on 32-bit branch > > > displacements (b.l) to handle large bpf programs. > > > > > > Tested with the test_bpf.ko: > > > test_bpf: Summary: 1061 PASSED, 0 FAILED, [1049/1049 JIT'ed] > > > test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed] > > > > > > Tested-by: Daniel Palmer > > > Signed-off-by: Kuan-Wei Chiu > > Thanks for your (impressive) patch! > > > From here it is really up to Geert now if and when he will pick this up. > > I am happy with this patch in its current form. > > Who am I to block this feature? ;-) > > > > --- a/arch/m68k/Kconfig > > > +++ b/arch/m68k/Kconfig > > > @@ -8,6 +8,7 @@ config M68K > > > select ARCH_HAS_CPU_FINALIZE_INIT if MMU > > > select ARCH_HAS_CURRENT_STACK_POINTER > > > select ARCH_HAS_DMA_PREP_COHERENT if M68K_NONCOHERENT_DMA && !COLDFIRE > > > + select HAVE_EBPF_JIT if MMU > > Pleave move this to the other "select HAVE_*" lines below, to preserve > sort order. Ack. Will fix in the next version. > > > > select ARCH_HAS_SYNC_DMA_FOR_DEVICE if M68K_NONCOHERENT_DMA > > > select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS > > > select ARCH_MIGHT_HAVE_PC_PARPORT if ISA > > I think you should also update > Documentation/features/core/eBPF-JIT/arch-support.txt. > I wasn't aware of this doc. Will update it and send out v6 shortly. Regards, Kuan-Wei