diff mbox series

[stable,6.1,1/2] btf, scripts: Exclude Rust CUs with pahole

Message ID 20240117094424.487462-2-jolsa@kernel.org (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series btf, scripts: Update pahole options | expand

Checks

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bpf/vmtest-bpf-PR success PR summary
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bpf/vmtest-bpf-VM_Test-8 success Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
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Commit Message

Jiri Olsa Jan. 17, 2024, 9:44 a.m. UTC 
From: Martin Rodriguez Reboredo <yakoyoku@gmail.com>

commit c1177979af9c616661a126a80dd486ad0543b836 upstream.

Version 1.24 of pahole has the capability to exclude compilation units (CUs)
of specific languages [1] [2]. Rust, as of writing, is not currently supported
by pahole and if it's used with a build that has BTF debugging enabled it
results in malformed kernel and module binaries [3]. So it's better for pahole
to exclude Rust CUs until support for it arrives.

Co-developed-by: Eric Curtin <ecurtin@redhat.com>
Signed-off-by: Eric Curtin <ecurtin@redhat.com>
Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=49358dfe2aaae4e90b072332c3e324019826783f [1]
Link: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=8ee363790b7437283c53090a85a9fec2f0b0fbc4 [2]
Link: https://github.com/Rust-for-Linux/linux/issues/735 [3]
Link: https://lore.kernel.org/bpf/20230111152050.559334-1-yakoyoku@gmail.com
---
 init/Kconfig            | 2 +-
 lib/Kconfig.debug       | 9 +++++++++
 scripts/pahole-flags.sh | 4 ++++
 3 files changed, 14 insertions(+), 1 deletion(-)

Comments

Greg Kroah-Hartman Jan. 17, 2024, 11:02 a.m. UTC | #1 
On Wed, Jan 17, 2024 at 10:44:23AM +0100, Jiri Olsa wrote:
> From: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
> 
> commit c1177979af9c616661a126a80dd486ad0543b836 upstream.
> 
> Version 1.24 of pahole has the capability to exclude compilation units (CUs)
> of specific languages [1] [2]. Rust, as of writing, is not currently supported
> by pahole and if it's used with a build that has BTF debugging enabled it
> results in malformed kernel and module binaries [3]. So it's better for pahole
> to exclude Rust CUs until support for it arrives.
> 
> Co-developed-by: Eric Curtin <ecurtin@redhat.com>
> Signed-off-by: Eric Curtin <ecurtin@redhat.com>
> Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
> Tested-by: Eric Curtin <ecurtin@redhat.com>
> Reviewed-by: Neal Gompa <neal@gompa.dev>
> Acked-by: Miguel Ojeda <ojeda@kernel.org>
> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> Link: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=49358dfe2aaae4e90b072332c3e324019826783f [1]
> Link: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=8ee363790b7437283c53090a85a9fec2f0b0fbc4 [2]
> Link: https://github.com/Rust-for-Linux/linux/issues/735 [3]
> Link: https://lore.kernel.org/bpf/20230111152050.559334-1-yakoyoku@gmail.com
> ---

You are forwarding this patch on, you also need to sign-off on it :(

thanks,

greg k-h
diff mbox series

Patch

diff --git a/init/Kconfig b/init/Kconfig
index de255842f5d0..148704640252 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1914,7 +1914,7 @@  config RUST
 	depends on !MODVERSIONS
 	depends on !GCC_PLUGINS
 	depends on !RANDSTRUCT
-	depends on !DEBUG_INFO_BTF
+	depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE
 	select CONSTRUCTORS
 	help
 	  Enables Rust support in the kernel.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4db0199651f5..95541b99aa8e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -364,6 +364,15 @@  config PAHOLE_HAS_BTF_TAG
 	  btf_decl_tag) or not. Currently only clang compiler implements
 	  these attributes, so make the config depend on CC_IS_CLANG.
 
+config PAHOLE_HAS_LANG_EXCLUDE
+	def_bool PAHOLE_VERSION >= 124
+	help
+	  Support for the --lang_exclude flag which makes pahole exclude
+	  compilation units from the supplied language. Used in Kbuild to
+	  omit Rust CUs which are not supported in version 1.24 of pahole,
+	  otherwise it would emit malformed kernel and module binaries when
+	  using DEBUG_INFO_BTF_MODULES.
+
 config DEBUG_INFO_BTF_MODULES
 	def_bool y
 	depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF
diff --git a/scripts/pahole-flags.sh b/scripts/pahole-flags.sh
index 0d99ef17e4a5..1f1f1d397c39 100755
--- a/scripts/pahole-flags.sh
+++ b/scripts/pahole-flags.sh
@@ -19,5 +19,9 @@  fi
 if [ "${pahole_ver}" -ge "122" ]; then
 	extra_paholeopt="${extra_paholeopt} -j"
 fi
+if [ "${pahole_ver}" -ge "124" ]; then
+	# see PAHOLE_HAS_LANG_EXCLUDE
+	extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
+fi
 
 echo ${extra_paholeopt}