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Update Concepts/Linux-cpu-2.md cpumask

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In x86_64 architecture `unsigned long` is 8-bytes size, so
 BITS_PER_BYTE * sizeof(long) = 64
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DeSmooth 2021-03-13 11:34:06 +08:00
parent 9abab6685d
commit 1a93aae518
2 changed files with 2 additions and 1 deletions
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Concepts/linux-cpu-2.md
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@ -59,7 +59,7 @@ where `BITS_TO_LONGS`:
As we are focusing on the `x86_64` architecture, `unsigned long` is 8-bytes size and our array will contain only one element:
```
(((8) + (8) - 1) / (8)) = 1
(((8) + (64) - 1) / (64)) = 1
```
`NR_CPUS` macro represents the number of CPUs in the system and depends on the `CONFIG_NR_CPUS` macro which is defined in [include/linux/threads.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/include/linux/threads.h) and looks like this:

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contributors.md
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@ -132,3 +132,4 @@ Thank you to all contributors:
* [Zhouyi Zhou](https://github.com/zhouzhouyi-hub)
* [Mingzhe Yang](https://github.com/Mutated1994)
* [Yuxin Wu](https://github.com/chaffz)
* [Biao Ding](https://github.com/SmallPond)