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fix two small typo

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Dongliang Mu 2016-08-29 18:52:05 -04:00
parent aad2a72f77
commit 299ec26e55
1 changed files with 2 additions and 2 deletions
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DataStructures/bitmap.md
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@ -180,7 +180,7 @@ static inline void __clear_bit(long nr, volatile unsigned long *addr)
} }
``` ```
Yes. As we see, it takes the same set of arguments and contains very similar block of inline assembler. It just uses the [btr](http://x86.renejeschke.de/html/file_module_x86_id_24.html) instruction instead of `bts`. As we can understand form the function's name, it clears a given bit by the given address. The `btr` instruction acts like `btr`. This instruction also selects a given bit which is specified in the first operand, stores its value in the `CF` flag register and clears this bit in the given bit array which is specified with second operand. Yes. As we see, it takes the same set of arguments and contains very similar block of inline assembler. It just uses the [btr](http://x86.renejeschke.de/html/file_module_x86_id_24.html) instruction instead of `bts`. As we can understand form the function's name, it clears a given bit by the given address. The `btr` instruction acts like `bts`. This instruction also selects a given bit which is specified in the first operand, stores its value in the `CF` flag register and clears this bit in the given bit array which is specified with second operand.
The atomic variant of the `__clear_bit` is `clear_bit`: The atomic variant of the `__clear_bit` is `clear_bit`:
@ -283,7 +283,7 @@ static inline void change_bit(long nr, volatile unsigned long *addr)
} }
``` ```
It is similar on `set_bit` function, but also has two differences. The first difference is `xor` operation instead of `or` and the second is `bts` instead of `bts`. It is similar on `set_bit` function, but also has two differences. The first difference is `xor` operation instead of `or` and the second is `btc` instead of `bts`.
For this moment we know the most important architecture-specific operations with bit arrays. Time to look at generic bitmap API. For this moment we know the most important architecture-specific operations with bit arrays. Time to look at generic bitmap API.