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f2bb0b4f15
mirror_ubuntu-kernels/arch/x86/kernel
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Thomas Gleixner f2bb0b4f15 x86/apic/32: Remove x86_cpu_to_logical_apicid 
This per CPU variable is just yet another form of voodoo programming. The
boot ordering is:

  per_cpu(x86_cpu_to_logical_apicid, cpu) = 1U << cpu;

  .....

  setup_apic()
     apic->init_apic_ldr()
       default_init_apic_ldr()
         apic_write(SET_APIC_LOGICAL_ID(1UL << smp_processor_id(), APIC_LDR);

     id = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR);
     WARN_ON(id != per_cpu(x86_cpu_to_logical_apicid, cpu));
     per_cpu(x86_cpu_to_logical_apicid, cpu) = id;

So first write the default into LDR and then validate it against the same default
which was set up during early boot APIC enumeration.

Brilliant, isn't it?

The comment above the per CPU variable declaration describes it well:
'Let's keep it ugly for now.'

Remove the useless gunk and use '1U << cpu' consistently all over the place.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
2023-08-09 11:58:23 -07:00
..
acpi x86/apic: Remove the pointless APIC version check 2023-08-09 11:58:19 -07:00
apic x86/apic/32: Remove x86_cpu_to_logical_apicid 2023-08-09 11:58:23 -07:00
cpu x86/apic: Get rid of hard_smp_processor_id() 2023-08-09 11:58:17 -07:00
fpu Updates for the x86 boot process: 2023-06-26 13:39:10 -07:00
kprobes probes updates for 6.3: 2023-02-23 13:03:08 -08:00
.gitignore
alternative.c x86/cfi: Only define poison_cfi() if CONFIG_X86_KERNEL_IBT=y 2023-07-11 10:17:55 +02:00
amd_gart_64.c x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros 2022-12-15 10:37:27 -08:00
amd_nb.c x86/amd_nb: Re-sort and re-indent PCI defines 2023-06-05 12:26:54 +02:00
aperture_64.c x86: Fix various duplicate-word comment typos 2022-08-15 19:17:52 +02:00
apm_32.c efi: x86: Wire up IBT annotation in memory attributes table 2023-02-09 19:30:54 +01:00
asm-offsets_32.c
asm-offsets_64.c x86: Fixup asm-offsets duplicate 2022-10-17 16:41:06 +02:00
asm-offsets.c x86/smpboot: Remove initial_stack on 64-bit 2023-03-21 13:35:53 +01:00
audit_64.c
bootflag.c
callthunks.c objtool changes for v6.5: 2023-06-27 15:05:41 -07:00
cfi.c x86: Add support for CONFIG_CFI_CLANG 2022-09-26 10:13:16 -07:00
check.c
cpuid.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
crash_core_32.c
crash_core_64.c
crash_dump_32.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
crash_dump_64.c use less confusing names for iov_iter direction initializers 2022-11-25 13:01:55 -05:00
crash.c x86/crash: Disable virt in core NMI crash handler to avoid double shootdown 2023-01-24 10:05:21 -08:00
devicetree.c x86/apic: Make some APIC init functions bool 2023-08-09 11:58:20 -07:00
doublefault_32.c x86: Avoid missing-prototype warnings for doublefault code 2023-05-18 11:56:18 -07:00
dumpstack_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
dumpstack_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
dumpstack.c x86/show_trace_log_lvl: Ensure stack pointer is aligned, again 2023-05-16 06:31:04 -07:00
e820.c x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery 2023-01-11 12:45:16 +01:00
early_printk.c x86/earlyprintk: Clean up pciserial 2022-08-29 12:19:25 +02:00
early-quirks.c drm/i915/rpl-p: Add PCI IDs 2022-04-19 17:14:09 -07:00
ebda.c
eisa.c
espfix_64.c x86/espfix: Use get_random_long() rather than archrandom 2022-10-31 20:12:50 +01:00
ftrace_32.S x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL 2023-06-20 18:38:38 -04:00
ftrace_64.S x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL 2023-06-20 18:38:38 -04:00
ftrace.c x86/ftrace: Remove unsued extern declaration ftrace_regs_caller_ret() 2023-07-10 21:38:13 -04:00
head32.c x86: Add dummy prototype for mk_early_pgtbl_32() 2023-05-18 11:56:16 -07:00
head64.c x86/head: Mark *_start_kernel() __noreturn 2023-04-14 17:31:24 +02:00
head_32.S x86/smpboot: Restrict soft_restart_cpu() to SEV 2023-05-15 13:44:50 +02:00
head_64.S A large update for SMP management: 2023-06-26 13:59:56 -07:00
hpet.c clocksource: Verify HPET and PMTMR when TSC unverified 2023-02-02 14:23:02 -08:00
hw_breakpoint.c x86/amd: Cache debug register values in percpu variables 2023-01-31 20:09:26 +01:00
i8237.c
i8253.c
i8259.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
idt.c x86/vector: Replace IRQ_MOVE_CLEANUP_VECTOR with a timer callback 2023-08-06 14:15:10 +02:00
io_delay.c
ioport.c
irq_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_work.c
irq.c x86/irq: Add hardcoded hypervisor interrupts to /proc/stat 2023-06-08 08:28:08 -07:00
irqflags.S
irqinit.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
itmt.c x86/sched/itmt: Give all SMT siblings of a core the same priority 2023-05-08 10:58:38 +02:00
jailhouse.c x86/apic: Remove the pointless APIC version check 2023-08-09 11:58:19 -07:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c
kexec-bzimage64.c docs: move x86 documentation into Documentation/arch/ 2023-03-30 12:58:51 -06:00
kgdb.c
ksysfs.c
kvm.c ARM64: 2022-12-15 11:12:21 -08:00
kvmclock.c x86/tsc: Provide sched_clock_noinstr() 2023-06-05 21:11:08 +02:00
ldt.c x86: allow get_locked_pte() to fail 2023-06-19 16:19:10 -07:00
machine_kexec_32.c
machine_kexec_64.c x86/kexec: remove unnecessary arch_kexec_kernel_image_load() 2023-04-08 13:45:38 -07:00
Makefile rethook, fprobe: do not trace rethook related functions 2023-05-18 07:08:01 +09:00
mmconf-fam10h_64.c
module.c x86/alternative: Rename apply_ibt_endbr() 2023-07-10 09:52:23 +02:00
mpparse.c x86/apic: Sanitize APIC address setup 2023-08-09 11:58:20 -07:00
msr.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
nmi_selftest.c
nmi.c locking/atomic: treewide: use raw_atomic*_<op>() 2023-06-05 09:57:20 +02:00
paravirt-spinlocks.c
paravirt.c x86/paravirt: Convert simple paravirt functions to asm 2023-03-17 13:29:47 +01:00
pci-dma.c docs: move x86 documentation into Documentation/arch/ 2023-03-30 12:58:51 -06:00
pcspeaker.c
perf_regs.c
platform-quirks.c x86/quirks: Include linux/pnp.h for arch_pnpbios_disabled() 2023-05-18 11:56:18 -07:00
pmem.c x86/pmem: Fix platform-device leak in error path 2022-06-20 18:01:16 +02:00
probe_roms.c x86/kernel: Validate ROM memory before accessing when SEV-SNP is active 2022-04-06 13:23:09 +02:00
process_32.c x86/resctl: fix scheduler confusion with 'current' 2023-03-08 11:48:11 -08:00
process_64.c IOMMU Updates for Linux 6.4 2023-04-30 13:00:38 -07:00
process.c x86: Rewrite ret_from_fork() in C 2023-07-10 09:52:25 +02:00
process.h
ptrace.c x86: Improve formatting of user_regset arrays 2022-11-01 15:36:52 -07:00
pvclock.c locking/atomic: treewide: use raw_atomic*_<op>() 2023-06-05 09:57:20 +02:00
quirks.c
reboot_fixups_32.c
reboot.c cpu: Mark nmi_panic_self_stop() __noreturn 2023-04-14 17:31:26 +02:00
relocate_kernel_32.S x86/kexec: Disable RET on kexec 2022-07-09 13:12:32 +02:00
relocate_kernel_64.S x86,objtool: Split UNWIND_HINT_EMPTY in two 2023-03-23 23:18:58 +01:00
resource.c x86/PCI: Tidy E820 removal messages 2022-12-10 10:33:11 -06:00
rethook.c x86,rethook: Fix arch_rethook_trampoline() to generate a complete pt_regs 2022-03-28 19:38:51 -07:00
rtc.c x86/rtc: Simplify PNP ids check 2023-01-06 04:22:34 +01:00
setup_percpu.c x86/apic/32: Remove x86_cpu_to_logical_apicid 2023-08-09 11:58:23 -07:00
setup.c x86/apic: Rename disable_apic 2023-08-09 11:58:16 -07:00
sev_verify_cbit.S
sev-shared.c x86/sev: Add SNP-specific unaccepted memory support 2023-06-06 18:31:37 +02:00
sev.c - Some SEV and CC platform helpers cleanup and simplifications now that 2023-06-27 13:26:30 -07:00
signal_32.c - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
signal_64.c x86/signal/compat: Move sigaction_compat_abi() to signal_64.c 2023-01-06 04:16:02 +01:00
signal.c x86/init: Initialize signal frame size late 2023-06-16 10:16:00 +02:00
smp.c A set of fixes for kexec(), reboot and shutdown issues 2023-06-26 14:45:53 -07:00
smpboot.c x86/apic: Nuke another processor check 2023-08-09 11:58:22 -07:00
stacktrace.c
static_call.c x86/static_call: Add support for Jcc tail-calls 2023-01-31 15:05:31 +01:00
step.c ptrace: Reimplement PTRACE_KILL by always sending SIGKILL 2022-05-11 14:34:28 -05:00
sys_ia32.c
sys_x86_64.c x86/mm: Cleanup the control_va_addr_alignment() __setup handler 2022-05-04 18:20:42 +02:00
tboot.c mm: remove rb tree. 2022-09-26 19:46:16 -07:00
time.c
tls.c x86/gsseg: Move load_gs_index() to its own new header file 2023-01-12 13:06:36 +01:00
tls.h
topology.c x86/topology: Remove CPU0 hotplug option 2023-05-15 13:44:49 +02:00
trace_clock.c
trace.c
tracepoint.c x86/traceponit: Fix comment about irq vector tracepoints 2022-05-26 22:03:52 -04:00
traps.c x86/traps: Fix load_unaligned_zeropad() handling for shared TDX memory 2023-07-25 15:29:01 -07:00
tsc_msr.c
tsc_sync.c x86/smpboot: Make TSC synchronization function call based 2023-05-15 13:44:53 +02:00
tsc.c Scheduler changes for v6.5: 2023-06-27 14:03:21 -07:00
umip.c
unwind_frame.c x86: kmsan: don't instrument stack walking functions 2022-10-03 14:03:25 -07:00
unwind_guess.c
unwind_orc.c objtool changes for v6.5: 2023-06-27 15:05:41 -07:00
uprobes.c uprobes/x86: Allow to probe a NOP instruction with 0x66 prefix 2022-12-05 11:55:18 +01:00
verify_cpu.S
vm86_32.c x86/32: Remove lazy GS macros 2022-04-14 14:09:43 +02:00
vmlinux.lds.S x86/retbleed: Add __x86_return_thunk alignment checks 2023-05-17 12:14:21 +02:00
vsmp_64.c x86/apic: Get rid of hard_smp_processor_id() 2023-08-09 11:58:17 -07:00
x86_init.c - Fix a race window where load_unaligned_zeropad() could cause 2023-06-26 16:32:47 -07:00