Hi Vineet, On 12/02/15 07:10, Vineet Gupta wrote: > 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() Judging by both these uses, it would be the task's user mode SP that is desired. Same for KSTK_EIP by the looks of it. Well spotted! I'll look into fixing Metag. Cheers James > > 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 >
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