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

EAPI=8

# This revision is fundamentally different from pf-sources-6.9_p6-r1.
# Instead of fetching pf-kernel/codeberg's GA-only sourcetree (Linux 6.9.0
# + pf patchset, no linux-stable updates), it builds on top of vanilla
# 6.9.tar.xz + Gentoo genpatches (sourced per-patch from alicef's live
# trunk dir, since release tarballs were never cut for the 6.9 branch),
# then applies a *curated* subset of natalenko's pf-kernel delta on top.
# See pkg_postinst for what's preserved versus what's dropped and why.
# The slot's pretend version stays "6.9_p6" so this ebuild remains
# drop-in-replaceable for users on the existing pf-sources slot.
#
# 6.9 is a non-LTS kernel that reached end-of-life upstream (linux-stable
# stopped at 6.9.12). The trunk-pinned patches captured here track stable
# all the way to 6.9.12 — full coverage for this EOL branch.
#
# Per-branch judgment on 5xxx (genpatches "experimental" category):
#   * 5010_enable-cpu-optimizations-universal: NOT included. Trunk's 5010
#     is calibrated against pf-kernel's view of arch/x86/Kconfig.cpu, not
#     pristine vanilla 6.9 — section anchors like X86_USE_PPRO_CHECKSUM
#     are ~15 lines off in vanilla 6.9 from kernel.org, so 5010's hunk
#     #10 cannot relocate within fuzz tolerance. Dropping 5010 lets the
#     partition classify pf's arch/x86/Kconfig.cpu and arch/x86/Makefile
#     as pf-only (since stable backports don't touch them on this slot),
#     so the curated subset applies pf's full ISA Kconfig naturally.
#   * 5020_BMQ-and-PDS-io-scheduler + 5021_BMQ-and-PDS-gentoo-defaults:
#     NOT included. Out of scope for the "minimal pf identity on
#     gentoo-sources" model.

ETYPE="sources"

K_NOSETEXTRAVERSION="1"

K_SECURITY_UNSUPPORTED="1"

SHPV="${PV/_p*/}"
PFPV="${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/"

# Per-slot snapshot of alicef's genpatches trunk for this branch,
# bundled into pf-genpatches-${SHPV}.tar.xz on the sister overlay
# extra-stuff (https://github.com/istitov/extra-stuff). Pinned by
# tag (-r70-0) so the URL is immutable; refreshing the snapshot
# means a new tag suffix. The original alicef trunk dir is a live
# working dir, so this bundle is the durable reference.
SRC_URI="https://www.kernel.org/pub/linux/kernel/v6.x/linux-${SHPV}.tar.xz
	https://raw.githubusercontent.com/istitov/extra-stuff/pf-genpatches-${SHPV}-r70-0/sys-kernel/pf-sources/pf-genpatches-${SHPV}.tar.xz -> pf-genpatches-${SHPV}-r70-0.tar.xz
	https://raw.githubusercontent.com/istitov/extra-stuff/pf-curated-${SHPV}-r70-0/sys-kernel/pf-sources/pf-curated-${SHPV}.tar.xz -> pf-curated-${SHPV}-r70-0.tar.xz"

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

KEYWORDS="~amd64 ~x86"

K_EXTRAEINFO="For more info on pf-sources 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 contact the pf developers directly."
	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() {
	eapply "${WORKDIR}/pf-genpatches-${SHPV}"/*.patch
	eapply "${WORKDIR}/pf-curated-${SHPV}"/*.patch
	default
}

pkg_postinst() {
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postinst

	elog ""
	elog "This revision (-r70) is the gentoo-sources-based pf-sources variant."
	elog "It tracks linux-stable through 6.9.12 (full upstream coverage — 6.9"
	elog "ended at .12) via alicef's genpatches trunk AND keeps a curated"
	elog "subset of natalenko's pf-kernel delta on top. 6.9 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 "  * x86 ISA levels (pf-style: MNATIVE / X86_64_ISA_LEVEL)"
	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 "Patches DROPPED from natalenko's patchset, with reasons:"
	elog "  * kernel/sched/{core,fair,rt}.c: gentoo-sources has newer"
	elog "    scheduler helpers. pf's older form would regress, not improve."
	elog "  * Most 'minor fixes' pf carries are now in linux-stable's 6.9.X"
	elog "    backports already (often in newer/better form)."
	elog ""
	elog "Patches NOT FETCHED from genpatches (per-branch judgment):"
	elog "  * 5010_enable-cpu-optimizations-universal: trunk's 5010 expects"
	elog "    pf-flavored vanilla; section anchors are off in vanilla 6.9"
	elog "    from kernel.org. Dropped — pf's own ISA Kconfig naturally lands"
	elog "    in the curated subset since stable backports don't touch"
	elog "    arch/x86/Kconfig.cpu on this slot."
	elog "  * 5020_BMQ-and-PDS-io-scheduler + 5021_BMQ-and-PDS-gentoo-defaults:"
	elog "    opt-in alternative scheduler. Out of scope for the 'minimal pf"
	elog "    identity on gentoo-sources' model. Use -r1 for pf's scheduler."
	elog ""
	elog "If you specifically need pf-kernel's full patchset, install"
	elog "pf-sources-6.9_p6-r1 instead — it stays GA-frozen and ships"
	elog "natalenko's patchset verbatim, at the cost of missing all twelve"
	elog "linux-stable releases (6.9.1-6.9.12) that this revision applies."
	elog ""

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

pkg_postrm() {
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postrm
}