[PR PATCH] linux5.7: enable BPF type format on x86_64

[PR PATCH] linux5.7: enable BPF type format on x86_64

[egorenar]

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There is a new pull request by egorenar against master on the void-packages repository

https://github.com/egorenar/void-packages linux-5.7-enable-btf-x86_64
https://github.com/void-linux/void-packages/pull/23534

linux5.7: enable BPF type format on x86_64
Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument

A patch file from https://github.com/void-linux/void-packages/pull/23534.patch is attached

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: github-pr-linux-5.7-enable-btf-x86_64-23534.patch --]
[-- Type: text/x-diff, Size: 1055 bytes --]

From 1459637b9d8d1df4ca46917da29d167d4517c236 Mon Sep 17 00:00:00 2001
From: Alexander Egorenkov <egorenar-dev@posteo.net>
Date: Sun, 12 Jul 2020 11:59:15 +0200
Subject: [PATCH] linux5.7: enable BPF type format on x86_64

Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument
---
 srcpkgs/linux5.7/files/x86_64-dotconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/srcpkgs/linux5.7/files/x86_64-dotconfig b/srcpkgs/linux5.7/files/x86_64-dotconfig
index 051a8db9923..9a94b7d6a16 100644
--- a/srcpkgs/linux5.7/files/x86_64-dotconfig
+++ b/srcpkgs/linux5.7/files/x86_64-dotconfig
@@ -9563,7 +9563,7 @@ CONFIG_DEBUG_INFO=y
 # CONFIG_DEBUG_INFO_REDUCED is not set
 # CONFIG_DEBUG_INFO_SPLIT is not set
 # CONFIG_DEBUG_INFO_DWARF4 is not set
-# CONFIG_DEBUG_INFO_BTF is not set
+CONFIG_DEBUG_INFO_BTF=y
 # CONFIG_GDB_SCRIPTS is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
 CONFIG_FRAME_WARN=1024

Re: linux5.7: enable BPF type format on x86_64

[ahesford]

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New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/23534#issuecomment-663012927

Comment:
According to the issue:
> Note that when using this config, pahole utility becomes a build dependency.
At a minimum, this dependency should be added to the template.

Re: linux5.7: enable BPF type format on x86_64

[ahesford]

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New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/23534#issuecomment-663012927

Comment:
According to the issue:
> Note that when using this config, pahole utility becomes a build dependency.

At a minimum, this dependency should be added to the template.

Re: [PR PATCH] [Updated] linux5.7: enable BPF type format on x86_64

[egorenar]

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There is an updated pull request by egorenar against master on the void-packages repository

https://github.com/egorenar/void-packages linux-5.7-enable-btf-x86_64
https://github.com/void-linux/void-packages/pull/23534

linux5.7: enable BPF type format on x86_64
Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument

A patch file from https://github.com/void-linux/void-packages/pull/23534.patch is attached

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: github-pr-linux-5.7-enable-btf-x86_64-23534.patch --]
[-- Type: text/x-diff, Size: 1558 bytes --]

From 60dc797faec449cf89a0d66f3bc4084487a10359 Mon Sep 17 00:00:00 2001
From: Alexander Egorenkov <egorenar-dev@posteo.net>
Date: Sun, 12 Jul 2020 11:59:15 +0200
Subject: [PATCH] linux5.7: enable BPF type format on x86_64

Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument
---
 srcpkgs/linux5.7/files/x86_64-dotconfig | 2 +-
 srcpkgs/linux5.7/template               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/srcpkgs/linux5.7/files/x86_64-dotconfig b/srcpkgs/linux5.7/files/x86_64-dotconfig
index 051a8db9923..9a94b7d6a16 100644
--- a/srcpkgs/linux5.7/files/x86_64-dotconfig
+++ b/srcpkgs/linux5.7/files/x86_64-dotconfig
@@ -9563,7 +9563,7 @@ CONFIG_DEBUG_INFO=y
 # CONFIG_DEBUG_INFO_REDUCED is not set
 # CONFIG_DEBUG_INFO_SPLIT is not set
 # CONFIG_DEBUG_INFO_DWARF4 is not set
-# CONFIG_DEBUG_INFO_BTF is not set
+CONFIG_DEBUG_INFO_BTF=y
 # CONFIG_GDB_SCRIPTS is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
 CONFIG_FRAME_WARN=1024
diff --git a/srcpkgs/linux5.7/template b/srcpkgs/linux5.7/template
index 7a250fb34c5..3b435f9b5c8 100644
--- a/srcpkgs/linux5.7/template
+++ b/srcpkgs/linux5.7/template
@@ -22,7 +22,7 @@ noshlibprovides=yes
 preserve=yes
 
 hostmakedepends="tar xz bc elfutils-devel flex gmp-devel kmod libmpc-devel
- libressl-devel perl uboot-mkimage cpio"
+ libressl-devel perl uboot-mkimage cpio pahole"
 
 _kernver="${version}_${revision}"
 triggers="kernel-hooks"

Re: [PR PATCH] [Updated] linux5.7: enable BPF type format on x86_64

[egorenar]

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There is an updated pull request by egorenar against master on the void-packages repository

https://github.com/egorenar/void-packages linux-5.7-enable-btf-x86_64
https://github.com/void-linux/void-packages/pull/23534

linux5.7: enable BPF type format on x86_64
Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument

A patch file from https://github.com/void-linux/void-packages/pull/23534.patch is attached

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: github-pr-linux-5.7-enable-btf-x86_64-23534.patch --]
[-- Type: text/x-diff, Size: 1558 bytes --]

From 370aaf60363dca37308dda58f91697ddee604597 Mon Sep 17 00:00:00 2001
From: Alexander Egorenkov <egorenar-dev@posteo.net>
Date: Sun, 12 Jul 2020 11:59:15 +0200
Subject: [PATCH] linux5.7: enable BPF type format on x86_64

Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument
---
 srcpkgs/linux5.7/files/x86_64-dotconfig | 2 +-
 srcpkgs/linux5.7/template               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/srcpkgs/linux5.7/files/x86_64-dotconfig b/srcpkgs/linux5.7/files/x86_64-dotconfig
index 051a8db9923..9a94b7d6a16 100644
--- a/srcpkgs/linux5.7/files/x86_64-dotconfig
+++ b/srcpkgs/linux5.7/files/x86_64-dotconfig
@@ -9563,7 +9563,7 @@ CONFIG_DEBUG_INFO=y
 # CONFIG_DEBUG_INFO_REDUCED is not set
 # CONFIG_DEBUG_INFO_SPLIT is not set
 # CONFIG_DEBUG_INFO_DWARF4 is not set
-# CONFIG_DEBUG_INFO_BTF is not set
+CONFIG_DEBUG_INFO_BTF=y
 # CONFIG_GDB_SCRIPTS is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
 CONFIG_FRAME_WARN=1024
diff --git a/srcpkgs/linux5.7/template b/srcpkgs/linux5.7/template
index 7a250fb34c5..3b435f9b5c8 100644
--- a/srcpkgs/linux5.7/template
+++ b/srcpkgs/linux5.7/template
@@ -22,7 +22,7 @@ noshlibprovides=yes
 preserve=yes
 
 hostmakedepends="tar xz bc elfutils-devel flex gmp-devel kmod libmpc-devel
- libressl-devel perl uboot-mkimage cpio"
+ libressl-devel perl uboot-mkimage cpio pahole"
 
 _kernver="${version}_${revision}"
 triggers="kernel-hooks"

Re: linux5.7: enable BPF type format on x86_64

[leahneukirchen]

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New comment by leahneukirchen on void-packages repository

https://github.com/void-linux/void-packages/pull/23534#issuecomment-668596164

Comment:
Hm, this works on 5.4 without the flag... do you know why? (It prints the error, but then does the thing.)

Re: linux5.7: enable BPF type format on x86_64

[q66]

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New comment by q66 on void-packages repository

https://github.com/void-linux/void-packages/pull/23534#issuecomment-668652031

Comment:
probably a red herring and the warnings are unrelated

Re: linux5.7: enable BPF type format on x86_64

[leahneukirchen]

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New comment by leahneukirchen on void-packages repository

https://github.com/void-linux/void-packages/pull/23534#issuecomment-668658870

Comment:
Enabling this for x86_64 now, results in ~900k overhead in vmlinuz, but for advanced usage it will probably be a common dependency in the future. Arch has enabled it as well. We'll follow up with other architectures after some testing.

Skipping rebuild for .13 to appear.

Re: [PR PATCH] [Merged]: linux5.7: enable BPF type format on x86_64

[leahneukirchen]

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There's a merged pull request on the void-packages repository

linux5.7: enable BPF type format on x86_64
https://github.com/void-linux/void-packages/pull/23534

Description:
Required e.g. for opensnoop from bcc-tools to fix the following problem:
libbpf: failed to find valid kernel BTF
libbpf: vmlinux BTF is not found
bpf: Failed to load program: Invalid argument