[PATCH v7 5/5] rust: add arch_static_branch

[Boqun Feng]

On Wed, Aug 21, 2024 at 07:54:51PM +0200, Miguel Ojeda wrote:
> On Wed, Aug 21, 2024 at 7:08 PM Boqun Feng <boqun.feng at gmail.com> wrote:
> >
> > Have you try this with "make O=<dir>"? I hit the following issue, but I
> > am rebasing on rust-dev, so I might miss something:
> >
> >         error: couldn't read ../rust/kernel/arch_static_branch_asm.rs: No such file or directory (os error 2)
> >           --> ../rust/kernel/jump_label.rs:39:17
> >            |
> >         39 | const _: &str = include!("arch_static_branch_asm.rs");
> >            |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >            |
> >            = note: this error originates in the macro `include` (in Nightly builds, run with -Z macro-backtrace for more info)
> >
> >         error: aborting due to 1 previous error
> 
> Yeah, we should use a `*TREE` everywhere. In addition, we should not
> use `SRCTREE` but `OBJTREE`. It is my fault, this comes from my
> prototype I gave Alice.
> 
> Please see the attached diff.
> 

Yes, this fix works, thanks!

Regards,
Boqun

> Cheers,
> Miguel

> diff --git a/rust/kernel/jump_label.rs b/rust/kernel/jump_label.rs
> index 7757e4f8e85e..ccfd20589c21 100644
> --- a/rust/kernel/jump_label.rs
> +++ b/rust/kernel/jump_label.rs
> @@ -36,7 +36,7 @@ macro_rules! static_key_false {
> 
>  /// Assert that the assembly block evaluates to a string literal.
>  #[cfg(CONFIG_JUMP_LABEL)]
> -const _: &str = include!("arch_static_branch_asm.rs");
> +const _: &str = include!(concat!(env!("OBJTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
> 
>  #[macro_export]
>  #[doc(hidden)]
> @@ -45,7 +45,7 @@ macro_rules! static_key_false {
>  macro_rules! arch_static_branch {
>      ($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: {
>          $crate::asm!(
> -            include!(concat!(env!("SRCTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
> +            include!(concat!(env!("OBJTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
>              l_yes = label {
>                  break 'my_label true;
>              },
> @@ -65,7 +65,7 @@ macro_rules! arch_static_branch {
>  macro_rules! arch_static_branch {
>      ($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: {
>          $crate::asm!(
> -            include!(concat!(env!("SRCTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
> +            include!(concat!(env!("OBJTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
>              l_yes = label {
>                  break 'my_label true;
>              },
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 4f0f6b13ebd7..746cce80545f 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -269,7 +269,7 @@ rust_allowed_features := asm_const,asm_goto,new_uninit
>  # current working directory, which may be not accessible in the out-of-tree
>  # modules case.
>  rust_common_cmd = \
> -	SRCTREE=$(abspath $(srctree)) \
> +	OBJTREE=$(abspath $(objtree)) \
>  	RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
>  	-Zallow-features=$(rust_allowed_features) \
>  	-Zcrate-attr=no_std \