sys-kernel/xanmod-sources-5.8.5 add Cachy-CPU-scheduler-v5.8.patch with useflag
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hedmo
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@ -1,3 +1,4 @@
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DIST 0001-sched-Introduce-the-Cachy-CPU-scheduler-v5.8.patch 287677 BLAKE2B ac74298043f43f74c780dd63e5abcf86294e831145c653eedd28a1b39959bdcfdbcdbee0071da47ad9e6bb6f837e04fbc0e93c232c82995731f957ce27d09361 SHA512 bdad88da6cf16722b0cd4f9c162ccdef83a2a92ee8767e35eb973b0c988dcd761146df5121e3202fdb68cfac03804dfa3ad44dc6fed50cb0794e0ea9fc389b90
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DIST linux-5.7.tar.xz 112690468 BLAKE2B b2b71e231507429b178b6b89be546c4a3ee2757f5d2c58b6137d383f16034a587225a75a9dbca6a01a433056ebe078487132c224e909a2971c9634687e47b1d1 SHA512 45bde01593f6147c8c169b9e46b4b56eee998142552ae0ff82f1dd21b1fd54f3b32f6283f6bd77ea717d374672167849e468c157f235d2f12f7d7816e4623bf6
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DIST linux-5.8.tar.xz 114459324 BLAKE2B 7bd97f8fa4527840754434414c07283e89731dc8ebb1e95fa5bc1469a60af1122582c0d3b6e262e77882f023190068df3537bd8b65964b3caa820bb2c8e579c7 SHA512 45a53ecf351096ef6e98242cca4228b8da9b9139ecc6963695791ea6fb7a9484a4e1c19dcca7ce7cbfdfa49de0451b70973bb078f12bdae9cbaddbc3f8092556
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DIST patch-5.7.12-xanmod1.xz 877072 BLAKE2B faabf0c524961dfb9edf8b8c3948520f08f0a86d76de8b097684247604b9ade43d90da467d8ae9e6a928a92bb41e944a64055641f0cd328264c889b51c222c53 SHA512 7866100c4361850c9a4802841d7698aea3c7ceaddaac659b324efca16459231d6cb5739481f024e1645d03239d5ebcd00dd1d1857ce654431d555aa94d89ab93
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@ -1,65 +0,0 @@
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diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
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index 91e29b6..9804a79 100644
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--- a/arch/x86/include/asm/stackprotector.h
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+++ b/arch/x86/include/asm/stackprotector.h
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@@ -55,8 +55,13 @@
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/*
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* Initialize the stackprotector canary value.
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*
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- * NOTE: this must only be called from functions that never return,
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+ * NOTE: this must only be called from functions that never return
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* and it must always be inlined.
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+ *
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+ * In addition, it should be called from a compilation unit for which
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+ * stack protector is disabled. Alternatively, the caller should not end
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+ * with a function call which gets tail-call optimized as that would
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+ * lead to checking a modified canary value.
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*/
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static __always_inline void boot_init_stack_canary(void)
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{
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diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
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index fe3ab96..4f275ac 100644
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--- a/arch/x86/kernel/smpboot.c
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+++ b/arch/x86/kernel/smpboot.c
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@@ -266,6 +266,14 @@ static void notrace start_secondary(void *unused)
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wmb();
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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+
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+ /*
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+ * Prevent tail call to cpu_startup_entry() because the stack protector
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+ * guard has been changed a couple of function calls up, in
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+ * boot_init_stack_canary() and must not be checked before tail calling
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+ * another function.
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+ */
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+ prevent_tail_call_optimization();
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}
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/**
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diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
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index 8fb8a50..f2adb63 100644
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--- a/arch/x86/xen/smp_pv.c
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+++ b/arch/x86/xen/smp_pv.c
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@@ -93,6 +93,7 @@ asmlinkage __visible void cpu_bringup_and_idle(void)
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cpu_bringup();
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boot_init_stack_canary();
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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+ prevent_tail_call_optimization();
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}
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void xen_smp_intr_free_pv(unsigned int cpu)
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diff --git a/include/linux/compiler.h b/include/linux/compiler.h
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index 034b0a6..732754d 100644
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--- a/include/linux/compiler.h
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+++ b/include/linux/compiler.h
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@@ -356,4 +356,10 @@ static inline void *offset_to_ptr(const int *off)
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/* &a[0] degrades to a pointer: a different type from an array */
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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+/*
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+ * This is needed in functions which generate the stack canary, see
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+ * arch/x86/kernel/smpboot.c::start_secondary() for an example.
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+ */
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+#define prevent_tail_call_optimization() asm("")
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+
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#endif /* __LINUX_COMPILER_H */
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@ -1,7 +1,10 @@
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
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<pkgmetadata>
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<use>
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<flag name="cachy">Enable cachy as a new cpu scheduler experimental patch.</flag>
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</use>
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<upstream>
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<remote-id type="github">xanmod/linux</remote-id>
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</upstream>
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</pkgmetadata>
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</pkgmetadata>
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@ -12,15 +12,22 @@ detect_version
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DESCRIPTION="A general-purpose kernel with custom settings and new features"
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HOMEPAGE="https://xanmod.org"
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LICENSE+=" CDDL"
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SRC_URI="${KERNEL_BASE_URI}/linux-${KV_MAJOR}.${KV_MINOR}.tar.xz https://github.com/xanmod/linux/releases/download/${OKV}-xanmod${XANMOD_VERSION}/patch-${OKV}-xanmod${XANMOD_VERSION}.xz"
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KEYWORDS="~amd64"
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CACHY_URI="https://dl.xanmod.org/experimental/cachy_cpu_sched/0001-sched-Introduce-the-Cachy-CPU-scheduler-v5.8.patch"
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IUSE="cachy"
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SRC_URI="${KERNEL_BASE_URI}/linux-${KV_MAJOR}.${KV_MINOR}.tar.xz https://github.com/xanmod/linux/releases/download/${OKV}-xanmod${XANMOD_VERSION}/patch-${OKV}-xanmod${XANMOD_VERSION}.xz
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( ${CACHY_URI} )
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"
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UNIPATCH_LIST_DEFAULT=""
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UNIPATCH_LIST="${DISTDIR}/patch-${OKV}-xanmod${XANMOD_VERSION}.xz"
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KEYWORDS="~amd64"
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src_prepare() {
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if use cachy; then
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eapply "${DISTDIR}/0001-sched-Introduce-the-Cachy-CPU-scheduler-v5.8.patch"
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fi
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kernel-2-src-prepare-overlay_src_prepare
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rm "${S}"/.config || die
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