semantics of KSTK_ESP and friends

[Vineet Gupta]

Hi,

Is KSTK_ESP supposed to return the kernel mode SP of a sleeping task or is it supposed to provide the user mode SP at the time of last kernel entry ?

The 2 non arch users of the API expect the user mode SP semantics:
* vm_is_stack_for_task() - to annotate /proc/<pid>/maps stack vma - which is shere Alexey noted this.
* do_task_stat()

ARC port uses these for unwinding the task of a sleeping task (hence kernel mode SP semantics).
metag (from the looks of it) also seem to provide kernel mode value, while most others seem to provide the user mode variant.

 I can fix ARC to work with expectation of generic code, but wanted to understand anyways.

Thx,
-Vineet
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/