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AJvYcCU/d4QnImCQJwr5KBpfZfV5ESOtDtMmZ5GAijKfFWmSYd9AmHQ2GStvJUue7K/kjfOfLLd1BdEaXjh9C6A=@vger.kernel.org X-Gm-Message-State: AOJu0YyzH22nOxKKeRjDN5ZBeqdatsgtI1+hHO0o/o9mTAeZMfEtjQju NelzvO605bQL7kOJ0t2eoeE5KHIu5GUpuS6mFKi8WGOSF4oieARuxqJxjc5aPMWkoYDsQkjms/E zeW7d+3YYzOaxXYBxrw== X-Received: from wrwo17.prod.google.com ([2002:a5d:6851:0:b0:439:cce8:91c8]) (user=aliceryhl job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:1787:b0:439:c6d9:7fc with SMTP id ffacd0b85a97d-43a04d95261mr12535461f8f.25.1773487338756; Sat, 14 Mar 2026 04:22:18 -0700 (PDT) Date: Sat, 14 Mar 2026 11:22:17 +0000 In-Reply-To: <20260314004012.GD534169@ax162> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260203-inline-helpers-v2-0-beb8547a03c9@google.com> <20260203-inline-helpers-v2-3-beb8547a03c9@google.com> <20260314004012.GD534169@ax162> Message-ID: Subject: Re: [PATCH v2 3/3] build: rust: provide an option to inline C helpers into Rust From: Alice Ryhl To: Nathan Chancellor Cc: Miguel Ojeda , Boqun Feng , Gary Guo , "=?utf-8?B?QmrDtnJu?= Roy Baron" , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , Alexandre Courbot , Will Deacon , Peter Zijlstra , Mark Rutland , Nick Desaulniers , Bill Wendling , Justin Stitt , Nicolas Schier , Andrew Morton , Uladzislau Rezki , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-kbuild@vger.kernel.org, linux-mm@kvack.org, Matthew Maurer Content-Type: text/plain; charset="utf-8" On Fri, Mar 13, 2026 at 05:40:12PM -0700, Nathan Chancellor wrote: > On Fri, Mar 06, 2026 at 05:32:33PM +0000, Alice Ryhl wrote: > > On Tue, Feb 03, 2026 at 11:34:10AM +0000, Alice Ryhl wrote: > > > $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers/helpers.c FORCE > > > $(call if_changed_dep,bindgen) > > > > > > +quiet_cmd_rust_helper = HELPER $@ > > > + cmd_rust_helper = \ > > > + $(CC) $(filter-out $(CFLAGS_REMOVE_helpers/helpers.o), $(c_flags)) \ > > > + -c -g0 $< $(if $(filter %_module.bc,$@),-DMODULE) -emit-llvm -o $@ > > > + > > > +$(obj)/helpers/helpers.bc $(obj)/helpers/helpers_module.bc: $(src)/helpers/helpers.c FORCE > > > + +$(call if_changed_dep,rust_helper) > > > > I think this needs: > > > > $(obj)/helpers/helpers.bc: private part-of-builtin := y > > $(obj)/helpers/helpers_module.bc: private part-of-module := y > > > > at least it seems to make a difference for AutoFDO. > > Would > > $(obj)/helpers/helpers.bc $(obj)/helpers/helpers_module.bc: private is-kernel-object := y > > work as well? Presumably, this is because c_flags only has the AutoFDO > flags when is-kernel-object is set, which is only true when > helpers/helpers.o is a part of obj-y. I assume so, but isn't it more correct to set part-of-builtin and part-of-module? I don't see any make rules making use of those directly (instead of is-kernel-object) right now, but if someone adds such uses, then this could become wrong, right? Alice