[PATCH] scripts: rust: drop is_rust_module.sh

[PATCH] scripts: rust: drop is_rust_module.sh

[Andrea Righi]

Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
to enable RUST.

With this constraint we don't need is_rust_module.sh anymore, because
'pahole --lang_exclude=rust' already has the capability to exclude Rust
CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
isn't used as well.

In any case is_rust_module.sh is obsolete and we can just drop it.

Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
---
 rust/macros/module.rs     |  2 +-
 scripts/Makefile.modfinal |  2 --
 scripts/is_rust_module.sh | 16 ----------------
 3 files changed, 1 insertion(+), 19 deletions(-)
 delete mode 100755 scripts/is_rust_module.sh

diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index a7e363c2b044..608406f33a70 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             /// Used by the printing macros, e.g. [`info!`].
             const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
 
-            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
+            /// The \"Rust loadable module\" mark.
             //
             // This may be best done another way later on, e.g. as a new modinfo
             // key or a new section. For the moment, keep it simple.
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 4703f652c009..e6f8fa3c9b8d 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -41,8 +41,6 @@ quiet_cmd_btf_ko = BTF [M] $@
       cmd_btf_ko = 							\
 	if [ ! -f vmlinux ]; then					\
 		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
-	elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then 		\
-		printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
 	else								\
 		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
 		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
deleted file mode 100755
index 28b3831a7593..000000000000
--- a/scripts/is_rust_module.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-#
-# is_rust_module.sh module.ko
-#
-# Returns `0` if `module.ko` is a Rust module, `1` otherwise.
-
-set -e
-
-# Using the `16_` prefix ensures other symbols with the same substring
-# are not picked up (even if it would be unlikely). The last part is
-# used just in case LLVM decides to use the `.` suffix.
-#
-# In the future, checking for the `.comment` section may be another
-# option, see https://github.com/rust-lang/rust/pull/97550.
-${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
-- 
2.39.2

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Nathan Chancellor]

On Fri, Apr 07, 2023 at 09:05:17AM +0200, Andrea Righi wrote:
> Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> to enable RUST.
> 
> With this constraint we don't need is_rust_module.sh anymore, because
> 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> isn't used as well.
> 
> In any case is_rust_module.sh is obsolete and we can just drop it.
> 
> Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
>  rust/macros/module.rs     |  2 +-
>  scripts/Makefile.modfinal |  2 --
>  scripts/is_rust_module.sh | 16 ----------------
>  3 files changed, 1 insertion(+), 19 deletions(-)
>  delete mode 100755 scripts/is_rust_module.sh
> 
> diff --git a/rust/macros/module.rs b/rust/macros/module.rs
> index a7e363c2b044..608406f33a70 100644
> --- a/rust/macros/module.rs
> +++ b/rust/macros/module.rs
> @@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
>              /// Used by the printing macros, e.g. [`info!`].
>              const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
>  
> -            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
> +            /// The \"Rust loadable module\" mark.
>              //
>              // This may be best done another way later on, e.g. as a new modinfo
>              // key or a new section. For the moment, keep it simple.

It seems like this whole section can be dropped? I only see
__IS_RUST_MODULE used in scripts/is_rust_module.sh, as the comment
states.

> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
x> index 4703f652c009..e6f8fa3c9b8d 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -41,8 +41,6 @@ quiet_cmd_btf_ko = BTF [M] $@
>        cmd_btf_ko = 							\
>  	if [ ! -f vmlinux ]; then					\
>  		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
> -	elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then 		\
> -		printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
>  	else								\
>  		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
>  		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
> diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
> deleted file mode 100755
> index 28b3831a7593..000000000000
> --- a/scripts/is_rust_module.sh
> +++ /dev/null
> @@ -1,16 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -#
> -# is_rust_module.sh module.ko
> -#
> -# Returns `0` if `module.ko` is a Rust module, `1` otherwise.
> -
> -set -e
> -
> -# Using the `16_` prefix ensures other symbols with the same substring
> -# are not picked up (even if it would be unlikely). The last part is
> -# used just in case LLVM decides to use the `.` suffix.
> -#
> -# In the future, checking for the `.comment` section may be another
> -# option, see https://github.com/rust-lang/rust/pull/97550.
> -${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
> -- 
> 2.39.2
> 

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Andrea Righi]

On Fri, Apr 07, 2023 at 10:53:18AM -0700, Nathan Chancellor wrote:
> On Fri, Apr 07, 2023 at 09:05:17AM +0200, Andrea Righi wrote:
> > Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> > introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> > to enable RUST.
> > 
> > With this constraint we don't need is_rust_module.sh anymore, because
> > 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> > CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> > then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> > isn't used as well.
> > 
> > In any case is_rust_module.sh is obsolete and we can just drop it.
> > 
> > Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> > Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
> 
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> 
> > ---
> >  rust/macros/module.rs     |  2 +-
> >  scripts/Makefile.modfinal |  2 --
> >  scripts/is_rust_module.sh | 16 ----------------
> >  3 files changed, 1 insertion(+), 19 deletions(-)
> >  delete mode 100755 scripts/is_rust_module.sh
> > 
> > diff --git a/rust/macros/module.rs b/rust/macros/module.rs
> > index a7e363c2b044..608406f33a70 100644
> > --- a/rust/macros/module.rs
> > +++ b/rust/macros/module.rs
> > @@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
> >              /// Used by the printing macros, e.g. [`info!`].
> >              const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
> >  
> > -            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
> > +            /// The \"Rust loadable module\" mark.
> >              //
> >              // This may be best done another way later on, e.g. as a new modinfo
> >              // key or a new section. For the moment, keep it simple.
> 
> It seems like this whole section can be dropped? I only see
> __IS_RUST_MODULE used in scripts/is_rust_module.sh, as the comment
> states.

In the scope of the kernel, yes, only is_rust_module.sh used that, but
outside the kernel "something" may still rely on this section. Keeping
it seems safer for now, to avoid potential user-space breakage.

Thanks,
-Andrea

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Eric Curtin]

On Fri, 7 Apr 2023 at 08:05, Andrea Righi <andrea.righi@canonical.com> wrote:
>
> Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> to enable RUST.
>
> With this constraint we don't need is_rust_module.sh anymore, because
> 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> isn't used as well.
>
> In any case is_rust_module.sh is obsolete and we can just drop it.
>
> Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

Ran this in an Asahi Fedora build to be sure.

Tested-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Eric Curtin <ecurtin@redhat.com>

Is mise le meas/Regards,

Eric Curtin

> ---
>  rust/macros/module.rs     |  2 +-
>  scripts/Makefile.modfinal |  2 --
>  scripts/is_rust_module.sh | 16 ----------------
>  3 files changed, 1 insertion(+), 19 deletions(-)
>  delete mode 100755 scripts/is_rust_module.sh
>
> diff --git a/rust/macros/module.rs b/rust/macros/module.rs
> index a7e363c2b044..608406f33a70 100644
> --- a/rust/macros/module.rs
> +++ b/rust/macros/module.rs
> @@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
>              /// Used by the printing macros, e.g. [`info!`].
>              const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
>
> -            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
> +            /// The \"Rust loadable module\" mark.
>              //
>              // This may be best done another way later on, e.g. as a new modinfo
>              // key or a new section. For the moment, keep it simple.
> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> index 4703f652c009..e6f8fa3c9b8d 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -41,8 +41,6 @@ quiet_cmd_btf_ko = BTF [M] $@
>        cmd_btf_ko =                                                     \
>         if [ ! -f vmlinux ]; then                                       \
>                 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
> -       elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then           \
> -               printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
>         else                                                            \
>                 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
>                 $(RESOLVE_BTFIDS) -b vmlinux $@;                        \
> diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
> deleted file mode 100755
> index 28b3831a7593..000000000000
> --- a/scripts/is_rust_module.sh
> +++ /dev/null
> @@ -1,16 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -#
> -# is_rust_module.sh module.ko
> -#
> -# Returns `0` if `module.ko` is a Rust module, `1` otherwise.
> -
> -set -e
> -
> -# Using the `16_` prefix ensures other symbols with the same substring
> -# are not picked up (even if it would be unlikely). The last part is
> -# used just in case LLVM decides to use the `.` suffix.
> -#
> -# In the future, checking for the `.comment` section may be another
> -# option, see https://github.com/rust-lang/rust/pull/97550.
> -${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
> --
> 2.39.2
>

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Neal Gompa]

On Fri, Apr 7, 2023 at 3:05 AM Andrea Righi <andrea.righi@canonical.com> wrote:
>
> Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> to enable RUST.
>
> With this constraint we don't need is_rust_module.sh anymore, because
> 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> isn't used as well.
>
> In any case is_rust_module.sh is obsolete and we can just drop it.
>
> Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
> ---
>  rust/macros/module.rs     |  2 +-
>  scripts/Makefile.modfinal |  2 --
>  scripts/is_rust_module.sh | 16 ----------------
>  3 files changed, 1 insertion(+), 19 deletions(-)
>  delete mode 100755 scripts/is_rust_module.sh
>
> diff --git a/rust/macros/module.rs b/rust/macros/module.rs
> index a7e363c2b044..608406f33a70 100644
> --- a/rust/macros/module.rs
> +++ b/rust/macros/module.rs
> @@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
>              /// Used by the printing macros, e.g. [`info!`].
>              const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
>
> -            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
> +            /// The \"Rust loadable module\" mark.
>              //
>              // This may be best done another way later on, e.g. as a new modinfo
>              // key or a new section. For the moment, keep it simple.
> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> index 4703f652c009..e6f8fa3c9b8d 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -41,8 +41,6 @@ quiet_cmd_btf_ko = BTF [M] $@
>        cmd_btf_ko =                                                     \
>         if [ ! -f vmlinux ]; then                                       \
>                 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
> -       elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then           \
> -               printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
>         else                                                            \
>                 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
>                 $(RESOLVE_BTFIDS) -b vmlinux $@;                        \
> diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
> deleted file mode 100755
> index 28b3831a7593..000000000000
> --- a/scripts/is_rust_module.sh
> +++ /dev/null
> @@ -1,16 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -#
> -# is_rust_module.sh module.ko
> -#
> -# Returns `0` if `module.ko` is a Rust module, `1` otherwise.
> -
> -set -e
> -
> -# Using the `16_` prefix ensures other symbols with the same substring
> -# are not picked up (even if it would be unlikely). The last part is
> -# used just in case LLVM decides to use the `.` suffix.
> -#
> -# In the future, checking for the `.comment` section may be another
> -# option, see https://github.com/rust-lang/rust/pull/97550.
> -${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
> --
> 2.39.2
>

LGTM.

Reviewed-by: Neal Gompa <neal@gompa.dev>



--
真実はいつも一つ！/ Always, there's only one truth!

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Masahiro Yamada]

On Fri, Apr 7, 2023 at 4:05 PM Andrea Righi <andrea.righi@canonical.com> wrote:
>
> Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> to enable RUST.
>
> With this constraint we don't need is_rust_module.sh anymore, because
> 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> isn't used as well.
>
> In any case is_rust_module.sh is obsolete and we can just drop it.
>
> Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> Signed-off-by: Andrea Righi


Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>


-- 
Best Regards
Masahiro Yamada

Re: [PATCH] scripts: rust: drop is_rust_module.sh

[Martin Rodriguez Reboredo]

On 4/7/23 04:05, Andrea Righi wrote:
> Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
> introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
> to enable RUST.
> 
> With this constraint we don't need is_rust_module.sh anymore, because
> 'pahole --lang_exclude=rust' already has the capability to exclude Rust
> CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
> then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
> isn't used as well.
> 
> In any case is_rust_module.sh is obsolete and we can just drop it.
> 
> Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
> ---
>  [...]

Go on

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>