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authorThomas Gleixner <tglx@linutronix.de>2020-01-23 12:54:53 +0100
committerIngo Molnar <mingo@kernel.org>2020-01-29 12:50:12 +0100
commit979923871f69a4dc926658f9f9a1a4c1bde57552 (patch)
treee9067d24ec18e59a887eada03aead116d17935a8 /certs
parent6bd3357b6181bd38c1a757168a8842e09ec6f3fb (diff)
x86/timer: Don't skip PIT setup when APIC is disabled or in legacy mode
Tony reported a boot regression caused by the recent workaround for systems which have a disabled (clock gate off) PIT. On his machine the kernel fails to initialize the PIT because apic_needs_pit() does not take into account whether the local APIC interrupt delivery mode will actually allow to setup and use the local APIC timer. This should be easy to reproduce with acpi=off on the command line which also disables HPET. Due to the way the PIT/HPET and APIC setup ordering works (APIC setup can require working PIT/HPET) the information is not available at the point where apic_needs_pit() makes this decision. To address this, split out the interrupt mode selection from apic_intr_mode_init(), invoke the selection before making the decision whether PIT is required or not, and add the missing checks into apic_needs_pit(). Fixes: c8c4076723da ("x86/timer: Skip PIT initialization on modern chipsets") Reported-by: Anthony Buckley <tony.buckley000@gmail.com> Tested-by: Anthony Buckley <tony.buckley000@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Daniel Drake <drake@endlessm.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206125 Link: https://lore.kernel.org/r/87sgk6tmk2.fsf@nanos.tec.linutronix.de
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