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Fix arch_local_irq_disable C code extract
In linux-initialization-4.md part, 'arch_local_irq_disable' is explained but the code displayed is the 'arch_local_irq_enable' function.
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@ -218,13 +218,13 @@ this_cpu_write(irq_stack_union.stack_canary, canary); // read below about this_c
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Again, we will not dive into details here, we will cover it in the part about [IRQs](http://en.wikipedia.org/wiki/Interrupt_request_%28PC_architecture%29). As canary is set, we disable local and early boot IRQs and register the bootstrap CPU in the CPU maps. We disable local IRQs (interrupts for current CPU) with the `local_irq_disable` macro which expands to the call of the `arch_local_irq_disable` function from [include/linux/percpu-defs.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/include/linux/percpu-defs.h):
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Again, we will not dive into details here, we will cover it in the part about [IRQs](http://en.wikipedia.org/wiki/Interrupt_request_%28PC_architecture%29). As canary is set, we disable local and early boot IRQs and register the bootstrap CPU in the CPU maps. We disable local IRQs (interrupts for current CPU) with the `local_irq_disable` macro which expands to the call of the `arch_local_irq_disable` function from [include/linux/percpu-defs.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/include/linux/percpu-defs.h):
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```C
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```C
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static inline notrace void arch_local_irq_enable(void)
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static inline notrace void arch_local_irq_disable(void)
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{
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{
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native_irq_enable();
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native_irq_disable();
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}
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}
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```
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```
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Where `native_irq_enable` is `cli` instruction for `x86_64`. As interrupts are disabled we can register the current CPU with the given ID in the CPU bitmap.
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Where `native_irq_disable` is `cli` instruction for `x86_64`. As interrupts are disabled we can register the current CPU with the given ID in the CPU bitmap.
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The first processor activation
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The first processor activation
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---------------------------------------------------------------------------------
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---------------------------------------------------------------------------------
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@ -106,3 +106,4 @@ Thank you to all contributors:
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* [Sachin Patil](https://github.com/psachin)
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* [Sachin Patil](https://github.com/psachin)
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* [Stéphan Gorget](https://github.com/phantez)
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* [Stéphan Gorget](https://github.com/phantez)
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* [Adrian Reyes](https://github.com/int3rrupt)
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* [Adrian Reyes](https://github.com/int3rrupt)
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* [JB Cayrou](https://github.com/jbcayrou)
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