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ARC: kernel stack: INIT_THREAD need not setup @init_stack in @ksp

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There are 2 pointers to kernel mode stack of a task
 - task_struct.stack: base address of stack page (max possible stack top)
 - thread_info.ksp  : runtime stack top in __switch_to

INIT_THREAD was setting up ksp to stack base which was not really needed
 - it would get overwritten with dynamic value on first call to
   __switch_to when init is switched out for the very first time.
 - generic code already does
      init_task.stack = init_stack
   and ARC code uses that to retrieve task's stack base.

Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2020-05-14 16:26:45 -07:00
parent cfca4b5abe
commit d1d1569e89
1 changed files with 1 additions and 3 deletions
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4
arch/arc/include/asm/processor.h
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@ -33,9 +33,7 @@ struct thread_struct {
#endif #endif
}; };
#define INIT_THREAD { \ #define INIT_THREAD { }
.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
}
/* Forward declaration, a strange C thing */ /* Forward declaration, a strange C thing */
struct task_struct; struct task_struct;