diff options
| author | Dou Liyang <douly.fnst@cn.fujitsu.com> | 2018-01-17 15:37:48 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-13 17:30:38 +0100 |
| commit | ccf5355d05cd891522267f04b2723002e7f061de (patch) | |
| tree | 37a5cc39dd9535f5de34b12d1a6cd204afdf38ab | |
| parent | afed7d172091040f38c75a2927fed170ea11585f (diff) | |
| download | linux-ccf5355d05cd891522267f04b2723002e7f061de.tar.bz2 | |
x86/apic: Simplify init_bsp_APIC() usage
Since CONFIG_X86_64 selects CONFIG_X86_LOCAL_APIC, the following
condition:
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
is equivalent to:
#if defined(CONFIG_X86_LOCAL_APIC)
... and we can eliminate that #ifdef by providing an empty
init_bsp_APIC() stub in the !CONFIG_X86_LOCAL_APIC case.
Also add some comments to explain why we call init_bsp_APIC().
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: mroos@linux.ee
Cc: ville.syrjala@linux.intel.com
Link: http://lkml.kernel.org/r/20180117073748.23905-1-douly.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/include/asm/apic.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/irqinit.c | 9 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 98722773391d..6e1990d69865 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -183,6 +183,7 @@ static inline void disable_local_APIC(void) { } # define setup_boot_APIC_clock x86_init_noop # define setup_secondary_APIC_clock x86_init_noop static inline void lapic_update_tsc_freq(void) { } +static inline void init_bsp_APIC(void) { } static inline void apic_intr_mode_init(void) { } static inline void lapic_assign_system_vectors(void) { } static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { } diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c index a539410c4ea9..772196c1b8c4 100644 --- a/arch/x86/kernel/irqinit.c +++ b/arch/x86/kernel/irqinit.c @@ -61,9 +61,14 @@ void __init init_ISA_irqs(void) struct irq_chip *chip = legacy_pic->chip; int i; -#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC) + /* + * Try to set up the through-local-APIC virtual wire mode earlier. + * + * On some 32-bit UP machines, whose APIC has been disabled by BIOS + * and then got re-enabled by "lapic", it hangs at boot time without this. + */ init_bsp_APIC(); -#endif + legacy_pic->init(0); for (i = 0; i < nr_legacy_irqs(); i++) |