mirror of
https://github.com/torvalds/linux.git
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685d982112
- The biggest change is the rework of the percpu code,
to support the 'Named Address Spaces' GCC feature,
by Uros Bizjak:
- This allows C code to access GS and FS segment relative
memory via variables declared with such attributes,
which allows the compiler to better optimize those accesses
than the previous inline assembly code.
- The series also includes a number of micro-optimizations
for various percpu access methods, plus a number of
cleanups of %gs accesses in assembly code.
- These changes have been exposed to linux-next testing for
the last ~5 months, with no known regressions in this area.
- Fix/clean up __switch_to()'s broken but accidentally
working handling of FPU switching - which also generates
better code.
- Propagate more RIP-relative addressing in assembly code,
to generate slightly better code.
- Rework the CPU mitigations Kconfig space to be less idiosyncratic,
to make it easier for distros to follow & maintain these options.
- Rework the x86 idle code to cure RCU violations and
to clean up the logic.
- Clean up the vDSO Makefile logic.
- Misc cleanups and fixes.
[ Please note that there's a higher number of merge commits in
this branch (three) than is usual in x86 topic trees. This happened
due to the long testing lifecycle of the percpu changes that
involved 3 merge windows, which generated a longer history
and various interactions with other core x86 changes that we
felt better about to carry in a single branch. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-core-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core x86 updates from Ingo Molnar:
- The biggest change is the rework of the percpu code, to support the
'Named Address Spaces' GCC feature, by Uros Bizjak:
- This allows C code to access GS and FS segment relative memory
via variables declared with such attributes, which allows the
compiler to better optimize those accesses than the previous
inline assembly code.
- The series also includes a number of micro-optimizations for
various percpu access methods, plus a number of cleanups of %gs
accesses in assembly code.
- These changes have been exposed to linux-next testing for the
last ~5 months, with no known regressions in this area.
- Fix/clean up __switch_to()'s broken but accidentally working handling
of FPU switching - which also generates better code
- Propagate more RIP-relative addressing in assembly code, to generate
slightly better code
- Rework the CPU mitigations Kconfig space to be less idiosyncratic, to
make it easier for distros to follow & maintain these options
- Rework the x86 idle code to cure RCU violations and to clean up the
logic
- Clean up the vDSO Makefile logic
- Misc cleanups and fixes
* tag 'x86-core-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
x86/idle: Select idle routine only once
x86/idle: Let prefer_mwait_c1_over_halt() return bool
x86/idle: Cleanup idle_setup()
x86/idle: Clean up idle selection
x86/idle: Sanitize X86_BUG_AMD_E400 handling
sched/idle: Conditionally handle tick broadcast in default_idle_call()
x86: Increase brk randomness entropy for 64-bit systems
x86/vdso: Move vDSO to mmap region
x86/vdso/kbuild: Group non-standard build attributes and primary object file rules together
x86/vdso: Fix rethunk patching for vdso-image-{32,64}.o
x86/retpoline: Ensure default return thunk isn't used at runtime
x86/vdso: Use CONFIG_COMPAT_32 to specify vdso32
x86/vdso: Use $(addprefix ) instead of $(foreach )
x86/vdso: Simplify obj-y addition
x86/vdso: Consolidate targets and clean-files
x86/bugs: Rename CONFIG_RETHUNK => CONFIG_MITIGATION_RETHUNK
x86/bugs: Rename CONFIG_CPU_SRSO => CONFIG_MITIGATION_SRSO
x86/bugs: Rename CONFIG_CPU_IBRS_ENTRY => CONFIG_MITIGATION_IBRS_ENTRY
x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRY
x86/bugs: Rename CONFIG_SLS => CONFIG_MITIGATION_SLS
...
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| .. | ||
| acpi | ||
| apic | ||
| cpu | ||
| fpu | ||
| kprobes | ||
| .gitignore | ||
| alternative.c | ||
| amd_gart_64.c | ||
| amd_nb.c | ||
| aperture_64.c | ||
| apm_32.c | ||
| asm-offsets_32.c | ||
| asm-offsets_64.c | ||
| asm-offsets.c | ||
| audit_64.c | ||
| bootflag.c | ||
| callthunks.c | ||
| cet.c | ||
| cfi.c | ||
| check.c | ||
| cpuid.c | ||
| crash_core_32.c | ||
| crash_core_64.c | ||
| crash_dump_32.c | ||
| crash_dump_64.c | ||
| crash.c | ||
| devicetree.c | ||
| doublefault_32.c | ||
| dumpstack_32.c | ||
| dumpstack_64.c | ||
| dumpstack.c | ||
| e820.c | ||
| early_printk.c | ||
| early-quirks.c | ||
| ebda.c | ||
| eisa.c | ||
| espfix_64.c | ||
| fred.c | ||
| ftrace_32.S | ||
| ftrace_64.S | ||
| ftrace.c | ||
| head32.c | ||
| head64.c | ||
| head_32.S | ||
| head_64.S | ||
| hpet.c | ||
| hw_breakpoint.c | ||
| i8237.c | ||
| i8253.c | ||
| i8259.c | ||
| ibt_selftest.S | ||
| idt.c | ||
| io_delay.c | ||
| ioport.c | ||
| irq_32.c | ||
| irq_64.c | ||
| irq_work.c | ||
| irq.c | ||
| irqflags.S | ||
| irqinit.c | ||
| itmt.c | ||
| jailhouse.c | ||
| jump_label.c | ||
| kdebugfs.c | ||
| kexec-bzimage64.c | ||
| kgdb.c | ||
| ksysfs.c | ||
| kvm.c | ||
| kvmclock.c | ||
| ldt.c | ||
| machine_kexec_32.c | ||
| machine_kexec_64.c | ||
| Makefile | ||
| mmconf-fam10h_64.c | ||
| module.c | ||
| mpparse.c | ||
| msr.c | ||
| nmi_selftest.c | ||
| nmi.c | ||
| paravirt-spinlocks.c | ||
| paravirt.c | ||
| pci-dma.c | ||
| pcspeaker.c | ||
| perf_regs.c | ||
| platform-quirks.c | ||
| pmem.c | ||
| probe_roms.c | ||
| process_32.c | ||
| process_64.c | ||
| process.c | ||
| process.h | ||
| ptrace.c | ||
| pvclock.c | ||
| quirks.c | ||
| reboot_fixups_32.c | ||
| reboot.c | ||
| relocate_kernel_32.S | ||
| relocate_kernel_64.S | ||
| resource.c | ||
| rethook.c | ||
| rtc.c | ||
| setup_percpu.c | ||
| setup.c | ||
| sev_verify_cbit.S | ||
| sev-shared.c | ||
| sev.c | ||
| shstk.c | ||
| signal_32.c | ||
| signal_64.c | ||
| signal.c | ||
| smp.c | ||
| smpboot.c | ||
| stacktrace.c | ||
| static_call.c | ||
| step.c | ||
| sys_ia32.c | ||
| sys_x86_64.c | ||
| tboot.c | ||
| time.c | ||
| tls.c | ||
| tls.h | ||
| topology.c | ||
| trace_clock.c | ||
| trace.c | ||
| tracepoint.c | ||
| traps.c | ||
| tsc_msr.c | ||
| tsc_sync.c | ||
| tsc.c | ||
| umip.c | ||
| unwind_frame.c | ||
| unwind_guess.c | ||
| unwind_orc.c | ||
| uprobes.c | ||
| verify_cpu.S | ||
| vm86_32.c | ||
| vmlinux.lds.S | ||
| vsmp_64.c | ||
| x86_init.c | ||