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    SubjectRe: [RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall
    On Thursday 10 September 2009, Sukadev Bhattiprolu wrote:
    > Since this is a variant of clone() and clone is listed as a PTREGSCALL(),
    > I pass in the pt_regs.
    > arch/x86/kernel/entry_32.S lists clone() under this comment:
    > /*
    > * System calls that need a pt_regs pointer.
    > */
    > Is there a guideline on what system calls use/need pt_regs ?

    You need pt_regs if you access any registers from the user task
    other than the argument registers. In case of clone(), this is
    the user stack pointer.

    The user_stack_pointer() function is relatively new, before this
    you couldn't get the stack pointer out of pt_regs in a generic

    Arnd <><

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      Last update: 2009-09-11 12:35    [W:0.034 / U:12.020 seconds]
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