focal: selftests/bpf build broken: test_map_init.skel.h: No such file or directory

[Kamal Mostafa]

Please partially revert:
  [focal] d946d4ddd6af bpf: Zero-fill re-used per-cpu map element
Such that we drop the tools/testing/selftests change but keep the beneficial change to kernel/bpf/hashtab.c.

Reported upstream:
 https://<email address hidden>/T/#u

---

This v5.4.78 commit breaks the tools/testing/selftests/bpf build:

[linux-5.4.y] c602ad2b52dc bpf: Zero-fill re-used per-cpu map element
[focal] d946d4ddd6af bpf: Zero-fill re-used per-cpu map element

Like this:

        prog_tests/map_init.c:5:10: fatal error: test_map_init.skel.h: No such file or directory
            5 | #include "test_map_init.skel.h"

Because tools/testing/selftests/bpf/Makefile in v5.4 does not have the
"skeleton header generation" stuff (circa v5.6).

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Kamal Mostafa (kamalmostafa)]

Verified fixed in focal (5.4.0-59.65).

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.4.0-59.65

---------------
linux (5.4.0-59.65) focal; urgency=medium

  * focal/linux: 5.4.0-59.65 -proposed tracker (LP: #1907604)

  * focal: selftests/bpf build broken: test_map_init.skel.h: No such file or
    directory (LP: #1906866)
    - SAUCE: Revert selftests/ "bpf: Zero-fill re-used per-cpu map element"

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * memory is leaked when tasks are moved to net_prio (LP: #1886859)
    - netprio_cgroup: Fix unlimited memory leak of v2 cgroups

  * Focal update: v5.4.78 upstream stable release (LP: #1905618)
    - drm/i915/gem: Flush coherency domains on first set-domain-ioctl
    - time: Prevent undefined behaviour in timespec64_to_ns()
    - nbd: don't update block size after device is started
    - KVM: arm64: Force PTE mapping on fault resulting in a device mapping
    - PCI: qcom: Make sure PCIe is reset before init for rev 2.1.0
    - usb: dwc3: gadget: Continue to process pending requests
    - usb: dwc3: gadget: Reclaim extra TRBs after request completion
    - btrfs: tracepoints: output proper root owner for trace_find_free_extent()
    - btrfs: sysfs: init devices outside of the chunk_mutex
    - btrfs: reschedule when cloning lots of extents
    - ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function
    - genirq: Let GENERIC_IRQ_IPI select IRQ_DOMAIN_HIERARCHY
    - hv_balloon: disable warning when floor reached
    - net: xfrm: fix a race condition during allocing spi
    - ASoC: codecs: wcd9335: Set digital gain range correctly
    - xfs: set xefi_discard when creating a deferred agfl free log intent item
    - netfilter: use actual socket sk rather than skb sk when routing harder
    - netfilter: nf_tables: missing validation from the abort path
    - netfilter: ipset: Update byte and packet counters regardless of whether they
      match
    - powerpc/eeh_cache: Fix a possible debugfs deadlock
    - perf trace: Fix segfault when trying to trace events by cgroup
    - perf tools: Add missing swap for ino_generation
    - ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link()
    - iommu/vt-d: Fix a bug for PDP check in prq_event_thread
    - afs: Fix warning due to unadvanced marshalling pointer
    - can: rx-offload: don't call kfree_skb() from IRQ context
    - can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ
      context
    - can: dev: __can_get_echo_skb(): fix real payload length return value for RTR
      frames
    - can: can_create_echo_skb(): fix echo skb generation: always use skb_clone()
    - can: j1939: swap addr and pgn in the send example
    - can: j1939: j1939_sk_bind(): return failure if netdev is down
    - can: ti_hecc: ti_hecc_probe(): add missed clk_disable_unprepare() in error
      path
    - can: xilinx_can: handle failure cases of pm_runtime_get_sync
    - can: peak_usb: add range checking in decode operations
    - can: peak_usb: peak_usb_get_ts_time(): fix timestamp wrapping
    - can: peak_canfd: pucan_handle_can_rx(): fix echo management when loopback is
      on
    - can: flexcan: remove FLEXCAN_QUIRK_DISABLE_MECR quirk for LS1021A
    - c...