main/linux-headers: fix swab.h on musl, enable linux-tools/bcc/libbpf on more architectures

linux-tools is broken on arm* because of errors like error: unknown type name '__always_inline' (see #11119 (closed)). The same problem exists for all architectures in community/libbpf and community/bcc, but there it was worked around using a patch to add #include <linux/stddef.h> to various files.

Indeed it seems like including linux/stddef.h is enough to get rid of the error. But the source of the problem is that it is not included from the swab.h header in main/linux-headers. Apparently this doesn't cause problems for glibc (it's probably defined somewhere in its internal headers...), but it does not work on musl.

A patch was submitted for this upstream at some point but for some reason it never received any reply. For now I have added it to main/linux-headers: This fixes the linux-tools build on arm* and allows getting rid of the workarounds in bcc+libbpf.

I used the chance to enable more architectures in linux-tools, bcc and libbpf. All of them seem to build sucessfully on CI at least.

Fixes #11119 (closed) (I hope so at least, haven't tested armhf specifically...)

Cc: @mps, @acjensen, @ncopa (seems like you tried to fix this before in 0caf800f)

added aports:improve label

I'm not sure linux-headers need patches, actually sounds to me as not good idea

I agree with @Minecrell and think this is worth trying. The header bug is an ongoing maintenance headache. Changes LGTM.

Do you have any specific concerns, @mps?

If the bug related to musl, then you should post patch there to be fixed and create workaround in kernel-headers

added 202 commits

• 8f5643d1...7b43fcb5 - 198 commits from branch alpine:master
• 2f3cc137 - main/linux-headers: add patch to fix swab.h on musl
• 29b90675 - community/bcc: remove unneeded stddef patch, enable on arm*
• 55ad3f6d - community/libbpf: remove unneeded stddef patch, enable all arch
• a232ff5a - testing/linux-tools: enable on arm*

Compare with previous version

I think this makes sense.

resolved all threads

added 5 commits

• 74d52751 - 1 commit from branch alpine:master
• 02733a95 - main/linux-headers: add patch to fix swab.h on musl
• 137a95b4 - community/bcc: remove unneeded stddef patch, enable on arm*
• b10693c2 - community/libbpf: remove unneeded stddef patch, enable all arch
• 8f869531 - testing/linux-tools: enable on arm*

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added 7 commits

• 8f869531...b33a840a - 3 commits from branch alpine:master
• bcaf03bb - main/linux-headers: add patch to fix swab.h on musl
• b3884538 - community/bcc: remove unneeded stddef patch, enable on arm*
• 19d83a2e - community/libbpf: remove unneeded stddef patch, enable all arch
• ce1f0175 - testing/linux-tools: enable on arm*

Compare with previous version

aborted the automatic merge because target branch was updated

added 6 commits

• ce1f0175...74029c47 - 2 commits from branch alpine:master
• 6ec1f82b - main/linux-headers: add patch to fix swab.h on musl
• 2d66b570 - community/bcc: remove unneeded stddef patch, enable on arm*
• c7b36a0a - community/libbpf: remove unneeded stddef patch, enable all arch
• e0ca5ce1 - testing/linux-tools: enable on arm*

Compare with previous version

merged