unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 bugfix from Thomas Gleixner:
 "A single bugfix for the recent changes related to registering the boot
  cpu when this has not happened before prefill_possible_map().

  The main problem with this change got fixed already, but we missed the
  case where the local APIC is not yet mapped, when prefill_possible_map()
  is invoked, so the registration of the boot cpu which has the APIC bit
  set in CPUID will explode.

  I should have seen that issue earlier, but all I can do now is feeling
  embarassed"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/smpboot: Init apic mapping before usage
This commit is contained in:
Linus Torvalds 2016-10-29 13:42:44 -07:00
commit 42fd2b5006
1 changed files with 6 additions and 1 deletions
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7
arch/x86/kernel/setup.c
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@ -1221,11 +1221,16 @@ void __init setup_arch(char **cmdline_p)
*/
get_smp_config();
/*
* Systems w/o ACPI and mptables might not have it mapped the local
* APIC yet, but prefill_possible_map() might need to access it.
*/
init_apic_mappings();
prefill_possible_map();
init_cpu_to_node();
init_apic_mappings();
io_apic_init_mappings();
kvm_guest_init();