linux-kernel - Re: [PATCH v10 5/5] rust: add arch_static

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Message-ID: <CANiq72nn6zv9MOD2ifTXbWV3W1AgiXL=6zTX_-eGL5ggLj4fbw@mail.gmail.com>
Date: Tue, 15 Oct 2024 14:11:05 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Jason Baron <jbaron@...mai.com>, Ard Biesheuvel <ardb@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	oe-kbuild-all@...ts.linux.dev, linux-trace-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Sean Christopherson <seanjc@...gle.com>, Uros Bizjak <ubizjak@...il.com>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v10 5/5] rust: add arch_static_branch

On Tue, Oct 15, 2024 at 1:06 PM kernel test robot <lkp@...el.com> wrote:
>
> >> /bin/sh: 1: cannot create rust/kernel/arch_static_branch_asm.rs: Directory nonexistent

This happens because we run `RSCPP` even when it is not a target. We
can add the dependency conditionally:

@@ -423,8 +425,10 @@ $(obj)/uapi.o: $(src)/uapi/lib.rs \
 $(obj)/kernel.o: private rustc_target_flags = --extern alloc \
     --extern build_error --extern macros --extern bindings --extern uapi
 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
-    $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o \
-       $(obj)/kernel/arch_static_branch_asm.rs FORCE
+    $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
        +$(call if_changed_rule,rustc_library)
+ifneq ($(CONFIG_JUMP_LABEL),)
+$(obj)/kernel.o: $(obj)/kernel/arch_static_branch_asm.rs
+endif

Cheers,
Miguel