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Fix arch_local_irq_disable C code extract

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In linux-initialization-4.md part, 'arch_local_irq_disable' is explained but the
code displayed is the 'arch_local_irq_enable' function.
This commit is contained in:
JB Cayrou 2017-08-04 15:44:22 +02:00
parent ddeb923d7f
commit b96b249fdf
2 changed files with 4 additions and 3 deletions
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6
Initialization/linux-initialization-4.md
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@ -218,13 +218,13 @@ this_cpu_write(irq_stack_union.stack_canary, canary); // read below about this_c
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):
```C
static inline notrace void arch_local_irq_enable(void)
static inline notrace void arch_local_irq_disable(void)
{
native_irq_enable();
native_irq_disable();
}
```
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.
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.
The first processor activation
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1
contributors.md
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@ -106,3 +106,4 @@ Thank you to all contributors:
* [Sachin Patil](https://github.com/psachin)
* [Stéphan Gorget](https://github.com/phantez)
* [Adrian Reyes](https://github.com/int3rrupt)
* [JB Cayrou](https://github.com/jbcayrou)