Files
kernel-agent/patches/arch/arm64/xor-neon-ffixed-x18-scs-build-fix-danctnix/README.md
T
claude-noether f203b70f4f fleet/ohm: switch bes2600 driver scope to cumulative-c5x-danctnix interim (closes #5 partial migration)
Audit during ohm pkgrel=4 migration found the per-series -danctnix
mirrors merged in #17 do NOT apply against the linux-pinetab2 baseline:
all 17 of them use DKMS-style root paths (bes2600/foo.c) rather than
in-tree staging paths (drivers/staging/bes2600/foo.c), and at least one
has a corrupted mixed-prefix header
(a/drivers/staging/bes2600/...  b/bes2600/...).

ka-promote ohm with those includes produced a 172 644-byte cumulative
touching 27 file paths, of which 11 are bogus. The hand-curated
0001-bes2600-besser-cumulative-series.patch from the working
danctnix-besser-pkgbuild flow on boltzmann (148 149 bytes, 48 in-tree
staging files) is what pkgrel=3 actually builds with.

Until the per-series mirrors are reconstructed (followup issue to be
opened separately), the bes2600 driver scope is satisfied here by
staging that hand-curated cumulative as a single-file series-dir
patches/driver/bes2600/cumulative-c5x-danctnix/. ohm.yaml drops the
broken per-series includes in favour of:

  - driver/bes2600/cumulative-c5x-danctnix/
  - driver/bes2600/scan-filter-5ghz-danctnix/      (closes besser#1)
  - arch/arm64/xor-neon-ffixed-x18-scs-build-fix-danctnix/

ka-promote ohm now produces a self-consistent 157 446-byte cumulative
(148 149 + 7 735 + 1 562 = exact byte arithmetic) with b2sum
a807297b25be... which is what the new
marfrit-packages/arch/linux-pinetab2-danctnix-besser PKGBUILD pkgrel=4
pins.

Also fixes fleet/ohm.yaml YAML parse error: bar5_burn_in had a scalar
value followed by a sub-list, which ka-promote (PyYAML) refused to
parse. The whole manifest had never parsed cleanly since #18 landed.

Refs: #5 (migrate PKGBUILD), #2 (mirror besser series — needs per-series
rewrite followup), besser#1 (Patch I).
2026-05-18 16:50:41 +02:00

1.0 KiB

xor-neon-ffixed-x18-scs-build-fix-danctnix — GCC 15.2.1 build fix

Restores -ffixed-x18 for arch/arm64/lib/xor-neon.c when CONFIG_SHADOW_CALL_STACK=y. GCC 15.2.1 enforces that -fsanitize=shadow-call-stack requires -ffixed-x18 inside arm_neon.h's #pragma GCC target() push/pop blocks; CC_FLAGS_REMOVE strips the kernel-wide -ffixed-x18 for xor-neon.o and CC_FLAGS_FPU does not restore it.

Note on current ohm config: linux-pinetab2-danctnix-besser config has # CONFIG_SHADOW_CALL_STACK is not set as of pkgrel=3, which makes this patch a runtime no-op ($(if $(CONFIG_SHADOW_CALL_STACK), -ffixed-x18) evaluates to nothing). Patch is kept in the manifest as belt-and-suspenders for the day SCS gets re-enabled (tracked in besser issue for GCC fix monitoring).

See reference_arm64_scs_arm_neon_gcc15 for the full toolchain analysis. This patch is the upstream-friendly Makefile fix; the config-side SHADOW_CALL_STACK=n workaround is the immediate runtime mitigation. Both are present in pkgrel=3 for safety.