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Merge pull request #748 from Mutated1994/patch-1

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Update linux-interrupts-1.md
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Sebastian Fricke 2020-10-31 06:25:15 +01:00 committed by GitHub
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Interrupts/linux-interrupts-1.md
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@ -274,7 +274,7 @@ The `PAGE_SIZE` is `4096`-bytes and the `THREAD_SIZE_ORDER` depends on the `KASA
#endif #endif
``` ```
`KASan` is a runtime memory [debugger](http://lwn.net/Articles/618180/). Thus, the `THREAD_SIZE` will be `16384` bytes if `CONFIG_KASAN` is disabled or `32768` if this kernel configuration option is enabled. These stacks contain useful data as long as a thread is alive or in a zombie state. While the thread is in user-space, the kernel stack is empty except for the `thread_info` structure (details about this structure are available in the fourth [part](https://0xax.gitbook.io/linux-insides/summary/initialization/linux-initialization-4) of the Linux kernel initialization process) at the bottom of the stack. The active or zombie threads aren't the only threads with their own stack. There also exist specialized stacks that are associated with each available CPU. These stacks are active when the kernel is executing on that CPU. When the user-space is executing on the CPU, these stacks do not contain any useful information. Each CPU has a few special per-cpu stacks as well. The first is the `interrupt stack` used for the external hardware interrupts. Its size is determined as follows: `KASan` is a runtime memory [debugger](http://lwn.net/Articles/618180/). Thus, the `THREAD_SIZE` will be `16384` bytes if `CONFIG_KASAN` is disabled or `32768` if this kernel configuration option is enabled. These stacks contain useful data as long as a thread is alive or in a zombie state. While the thread is in user-space, the kernel stack is empty except for the `thread_info` structure (details about this structure are available in the fourth [part](https://0xax.gitbook.io/linux-insides/summary/initialization/linux-initialization-4) of the Linux kernel initialization process) at the end of the stack. The active or zombie threads aren't the only threads with their own stack. There also exist specialized stacks that are associated with each available CPU. These stacks are active when the kernel is executing on that CPU. When the user-space is executing on the CPU, these stacks do not contain any useful information. Each CPU has a few special per-cpu stacks as well. The first is the `interrupt stack` used for the external hardware interrupts. Its size is determined as follows:
```C ```C
#define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER) #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)