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Merge pull request #375 from thismachinechills/patch-1

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Correct the include/linux/spinlock.h URL
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0xAX 2016-04-18 14:40:15 +06:00
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SyncPrim/sync-2.md
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@ -17,7 +17,7 @@ We saw [API](https://en.wikipedia.org/wiki/Application_programming_interface) of
* `spin_is_locked` - returns the state of the given `spinlock`;
* and etc.
And we know that all of these macro which are defined in the [include/linux/spinlock.h](https://github.com/torvalds/linux/master/include/linux/spinlock.h) header file will be expanded to the call of the functions with `arch_spin_.*` prefix from the [arch/x86/include/asm/spinlock.h](https://github.com/torvalds/linux/blob/master/arch/x86/include/asm/spinlock.h) for the [x86_64](https://en.wikipedia.org/wiki/X86-64) architecture. If we will look at this header fill with attention, we will that these functions (`arch_spin_is_locked`, `arch_spin_lock`, `arch_spin_unlock` and etc) defined only if the `CONFIG_QUEUED_SPINLOCKS` kernel configuration option is disabled:
And we know that all of these macro which are defined in the [include/linux/spinlock.h](https://github.com/torvalds/linux/blob/master/include/linux/spinlock.h) header file will be expanded to the call of the functions with `arch_spin_.*` prefix from the [arch/x86/include/asm/spinlock.h](https://github.com/torvalds/linux/blob/master/arch/x86/include/asm/spinlock.h) for the [x86_64](https://en.wikipedia.org/wiki/X86-64) architecture. If we will look at this header fill with attention, we will that these functions (`arch_spin_is_locked`, `arch_spin_lock`, `arch_spin_unlock` and etc) defined only if the `CONFIG_QUEUED_SPINLOCKS` kernel configuration option is disabled:
```C
#ifdef CONFIG_QUEUED_SPINLOCKS