# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

# 6.5 is a non-LTS kernel that reached end-of-life upstream (linux-stable
# stopped at 6.5.13). The trunk-pinned patches captured here track stable
# all the way to 6.5.13 — full coverage for this EOL branch.
#
# Per-branch judgment on 5xxx (genpatches "experimental" category):
#   * 5010_enable-cpu-optimizations-universal: included (small, x86 ISA
#     Kconfig — the partition drops pf's both-touched arch/x86 changes
#     anyway, so genpatches' Kconfig wins either way; user gets ISA-level
#     options under MK8SSE3/MZEN/MZEN2 names).
#   * 5020_BMQ-and-PDS-io-scheduler: NOT included. Adding BMQ would mean
#     11k lines + 40 files of opt-in alternative scheduler on a slot
#     whose curated subset already drops pf's scheduler tweaks — out of
#     scope for the "minimal pf identity on gentoo-sources" model.

ETYPE="sources"

# Curated pf delta sets EXTRAVERSION via the patch itself.
K_NOSETEXTRAVERSION="1"

# K_SECURITY_UNSUPPORTED is set because the curated pf delta is not
# covered by Gentoo's security
# team — bugs in the pf-specific portions (BBRv3, zstd bump, DDCCI,
# AMD-pstate, syscall.tbl additions) need to be reported to natalenko or
# the overlay maintainers. Note that 6.5 itself is EOL upstream, so no
# further linux-stable backports will arrive.
K_SECURITY_UNSUPPORTED="1"

# Map "6.5_p6" → "6.5" for the kernel.org tarball + genpatches.
SHPV="${PV/_p*/}"

# Pretend version visible in /lib/modules and /usr/src.
PFPV="${PV/_p/-pf}"

inherit kernel-2 optfeature

DESCRIPTION="Linux kernel: gentoo-sources base + curated pf-kernel patchset"
HOMEPAGE="https://pfkernel.natalenko.name/
	https://dev.gentoo.org/~alicef/genpatches/"

# alicef's trunk holds the per-branch genpatches working tree. There are
# no release tarballs for the 6.5 branch (last bundle on dev.gentoo.org
# is for 6.3, then 6.6); the trunk dir is the only place these patches
# still live. We pin individual patch URLs in SRC_URI so the Manifest
# captures their byte hashes — if alicef edits a patch in place, fetch
# will fail loudly rather than silently change behaviour.
# Per-slot snapshot of alicef's genpatches trunk for this branch,
# bundled into pf-genpatches-${SHPV}.tar.xz on the sister overlay
# extra-stuff (https://github.com/istitov/extra-stuff). Pinned by
# tag (-r70-1) so the URL is immutable; refreshing the snapshot
# means a new tag suffix. The original alicef trunk dir is a live
# working dir, so this bundle is the durable reference.
SRC_URI="https://www.kernel.org/pub/linux/kernel/v6.x/linux-${SHPV}.tar.xz
	https://raw.githubusercontent.com/istitov/extra-stuff/pf-genpatches-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-genpatches-${SHPV}.tar.xz -> pf-genpatches-${SHPV}-r70-1.tar.xz
	https://codeberg.org/istitov/extra-stuff/raw/tag/pf-genpatches-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-genpatches-${SHPV}.tar.xz -> pf-genpatches-${SHPV}-r70-1.tar.xz
	https://gitlab.com/istitov/extra-stuff/-/raw/pf-genpatches-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-genpatches-${SHPV}.tar.xz -> pf-genpatches-${SHPV}-r70-1.tar.xz
	https://raw.githubusercontent.com/istitov/extra-stuff/pf-curated-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-curated-${SHPV}.tar.xz -> pf-curated-${SHPV}-r70-1.tar.xz
	https://codeberg.org/istitov/extra-stuff/raw/tag/pf-curated-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-curated-${SHPV}.tar.xz -> pf-curated-${SHPV}-r70-1.tar.xz
	https://gitlab.com/istitov/extra-stuff/-/raw/pf-curated-${SHPV}-r70-1/sys-kernel/pf-sources-extended/pf-curated-${SHPV}.tar.xz -> pf-curated-${SHPV}-r70-1.tar.xz"

S="${WORKDIR}/linux-${SHPV}"

KEYWORDS=""

K_EXTRAEINFO="For more info on pf-kernel and details on how to report problems,
	see: ${HOMEPAGE}."

pkg_setup() {
	ewarn ""
	ewarn "${PN} is *not* supported by the Gentoo Kernel Project in any way."
	ewarn "If you need support, please create an issue at"
	ewarn "https://github.com/istitov/stuff/issues"
	ewarn "Do *not* open bugs in Gentoo's bugzilla unless you have issues with"
	ewarn "the ebuilds. Thank you."
	ewarn ""

	kernel-2_pkg_setup
}

src_unpack() {
	unpack ${A}
}

src_prepare() {
	# Apply the genpatches stack (stable backports + non-stable additions).
	eapply "${WORKDIR}/pf-genpatches-${SHPV}"/*.patch

	# Curated pf-kernel delta on top of gentoo-sources state.
	# See pkg_postinst for the kept/dropped breakdown.
	eapply "${WORKDIR}/pf-curated-${SHPV}"/*.patch

	default
}

pkg_postinst() {
	# Fixes "wrongly" detected directory name, bgo#862534.
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postinst

	elog ""
	elog "This is the gentoo-sources-based pf-sources-extended kernel."
	elog "It tracks linux-stable through 6.5.13 (full upstream coverage — 6.5"
	elog "ended at .13) via alicef's genpatches trunk AND keeps a curated"
	elog "subset of natalenko's pf-kernel delta on top. 6.5 is an EOL non-LTS"
	elog "branch — no further linux-stable backports will arrive."
	elog ""
	elog "Curated pf features RETAINED from natalenko's patchset:"
	elog "  * BBRv3 TCP congestion control (net/ipv4/tcp_bbr* and helpers)"
	elog "  * zstd compression library updates (lib/zstd/)"
	elog "  * DDCCI / DDCCI-backlight drivers (drivers/char/ddcci.c)"
	elog "  * AMD-pstate cpufreq enhancements (drivers/cpufreq/amd-pstate.c)"
	elog "  * syscall.tbl additions across arches (futex_waitv etc.)"
	elog "  * Subset of mm/include hooks (madvise, ksm, smpboot)"
	elog ""
	elog "x86 ISA-level Kconfig comes from genpatches' 5010 patch on this slot"
	elog "(MK8SSE3, MZEN, MZEN2 etc.) rather than pf's variant — genpatches'"
	elog "arch/x86/Kconfig.cpu changes apply first and pf's both-touched"
	elog "arch/x86 work is dropped by the curated subset to avoid conflicts."
	elog ""
	elog "Patches DROPPED from natalenko's patchset, with reasons:"
	elog "  * kernel/sched/{core,fair,rt}.c: gentoo-sources has newer"
	elog "    scheduler helpers (uclamp + thermal). Keeping pf's older form"
	elog "    would regress, not improve, scheduler behaviour."
	elog "  * fs/cifs/* and fs/ksmbd/*: stable backports already cover the"
	elog "    same fixes in newer form; pf's pre-rename patches conflict."
	elog "  * Most 'minor fixes' pf carries are now in linux-stable's 6.5.X"
	elog "    backports already (often in newer/better form)."
	elog ""
	elog "Patches NOT FETCHED from genpatches (per-branch judgment):"
	elog "  * 5020_BMQ-and-PDS-io-scheduler: opt-in alternative scheduler,"
	elog "    11k lines / 40 files. Out of scope for the 'minimal pf identity"
	elog "    on gentoo-sources' model. Use -r1 if you want pf's scheduler."
	elog ""
	elog "If you specifically need pf-kernel's full patchset, install"
	elog "pf-sources-6.5_p6-r1 instead — it stays GA-frozen and ships"
	elog "natalenko's patchset verbatim, at the cost of missing all thirteen"
	elog "linux-stable releases (6.5.1-6.5.13) that this revision applies."
	elog ""

	optfeature "userspace KSM helper" sys-process/uksmd
}

pkg_postrm() {
	# Same here, bgo#862534.
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postrm
}