Merge pull request #806 from lemon1989/master

fix: irq_backing_store to irq_stack_backing_store.

Interrupts/linux-interrupts-1.md

@@ -370,10 +370,10 @@ int irq_init_percpu_irqstack(unsigned int cpu)
 }
 ```
 
-Here we go over all the CPUs one-by-one and setup the `hardirq_stack_ptr`.
-Where `map_irq_stack` is called to initialize the `hardirq_stack_ptr`,
-to point onto the `irq_backing_store` of the current CPU with an offset of IRQ\_STACK\_SIZE,
-either with guard pages or without when KASan is enabled.
+Here we go over all the CPUs one-by-one and setup the `hardirq_stack_ptr`.  
+Where `map_irq_stack` is called to initialize the `hardirq_stack_ptr`,  
+to point onto the `irq_stack_backing_store` of the current CPU with an offset of IRQ\_STACK\_SIZE,   
+either with guard pages or without when KASan is enabled.  
 
 
 After the initialization of the interrupt stack, we need to initialize the gs register within [arch/x86/kernel/cpu/common.c](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/kernel/cpu/common.c):

Interrupts/linux-interrupts-2.md

@@ -357,7 +357,7 @@ $ sudo cat /proc/lockdep
  redundant softirq offs:                  0
 ```
 
-Ok, now we know a little about tracing, but more info will be in the separate part about `lockdep` and `tracing`. You can see that the both `local_disable_irq` macros have the same part - `raw_local_irq_disable`. This macro defined in the [arch/x86/include/asm/irqflags.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/include/asm/irqflags.h) and expands to the call of the:
+Ok, now we know a little about tracing, but more info will be in the separate part about `lockdep` and `tracing`. You can see that the both `local_irq_disable` macros have the same part - `raw_local_irq_disable`. This macro defined in the [arch/x86/include/asm/irqflags.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/include/asm/irqflags.h) and expands to the call of the:
 
 ```C
 static inline void native_irq_disable(void)

Interrupts/linux-interrupts-5.md

@@ -150,7 +150,7 @@ enum ctx_state {
 } state;
 ```
 
-The second function is `exception_exit` defined in the same [include/linux/context_tracking.h](https://github.com/torvalds/linux/tree/master/include/linux/context_tracking.h) file and checks that context tracking is enabled and call the `contert_tracking_enter` function if the previous context was `user`:
+The second function is `exception_exit` defined in the same [include/linux/context_tracking.h](https://github.com/torvalds/linux/tree/master/include/linux/context_tracking.h) file and checks that context tracking is enabled and call the `context_tracking_enter` function if the previous context was `user`:
 
 ```C
 static inline void exception_exit(enum ctx_state prev_ctx)

Interrupts/linux-interrupts-6.md

@@ -169,7 +169,7 @@ pushq	$-1
 ALLOC_PT_GPREGS_ON_STACK
 ```
 
-We already saw implementation of the `ALLOC_PT_GREGS_ON_STACK` macro in the third part of the interrupts [chapter](https://0xax.gitbook.io/linux-insides/summary/interrupts/linux-interrupts-3). This macro defined in the [arch/x86/entry/calling.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/entry/calling.h) and yet another allocates `120` bytes on stack for the general purpose registers, from the `rdi` to the `r15`:
+We already saw implementation of the `ALLOC_PT_GPREGS_ON_STACK` macro in the third part of the interrupts [chapter](https://0xax.gitbook.io/linux-insides/summary/interrupts/linux-interrupts-3). This macro defined in the [arch/x86/entry/calling.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/entry/calling.h) and yet another allocates `120` bytes on stack for the general purpose registers, from the `rdi` to the `r15`:
 
 ```assembly
 .macro ALLOC_PT_GPREGS_ON_STACK addskip=0