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Miller" , David Ahern , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , X86 ML , "H . Peter Anvin" , Andrew Morton , linux-arm-kernel , LKML , Network Development , kernel-patches-bot@fb.com Subject: Re: [PATCH bpf-next 0/4] bpf: tailcall: Eliminate max_entries and bpf_func access at runtime Message-ID: References: <20260102150032.53106-1-leon.hwang@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260115_100023_407373_BE0CDD60 X-CRM114-Status: GOOD ( 17.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jan 14, 2026 at 01:56:11PM -0800, Alexei Starovoitov wrote: > On Wed, Jan 14, 2026 at 1:00 PM Jiri Olsa wrote: > > > > > > > > > fyi I briefly discussed that with Andrii indicating that it might not > > > > be worth the effort at this stage. > > > > > > depending on complexity of course. > > > > for my tests I just had to allow BPF_MAP_TYPE_PROG_ARRAY map > > for sleepable programs > > > > jirka > > > > > > --- > > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c > > index faa1ecc1fe9d..1f6fc74c7ea1 100644 > > --- a/kernel/bpf/verifier.c > > +++ b/kernel/bpf/verifier.c > > @@ -20969,6 +20969,7 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env, > > case BPF_MAP_TYPE_STACK: > > case BPF_MAP_TYPE_ARENA: > > case BPF_MAP_TYPE_INSN_ARRAY: > > + case BPF_MAP_TYPE_PROG_ARRAY: > > break; > > default: > > verbose(env, > > Think it through, add selftests, ship it. > On the surface the easy part is to make > __bpf_prog_map_compatible() reject sleepable/non-sleepable combo. > Maybe there are other things. ok, thanks jirka