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    SubjectRe: [RFC][v8][PATCH 0/10] Implement clone3() system call
    Roland McGrath [] wrote:
    | Some userland debugging things and so forth like to look at the clone_flags
    | argument, so that is kept simpler for them if it stays in a register
    | (i.e. its own argument) rather than a user pointer fetch for that argument.
    | Any problem with:
    | sys_clone3(unsigned long clone_flags,
    | struct clone_struct __user *cs, pid_t __user *pids)
    | ?

    My only concern is the support of 64-bit clone flags on 32-bit architectures.
    We would need an additional register/parameter, clone_flags_high ? Also,
    hopefully we won't need more than 64 flags, but if we do, the plan AFACIT,
    was that we could use one of the reserved fields.

    | That also has the side benefit that instead of non-ia64 users forever
    | asking, "Why is it clone3 when there is no clone2?" you can instead pretend
    | that it follows the "clone3 because it takes three arguments" convention. ;-)
    | Btw, IMHO "struct foo_struct" is one of the lamest naming conventions ever.
    | How about "struct clone_args"?

    Sure :-) In earlier version of patches I had mixed up clone_struct and
    clone_arg in comments/descriptions and cleaned up in this version.
    | Also, if you were to replace:
    | u64 child_stack;
    | with:
    | u64 child_stack_base;
    | u64 child_stack_size;
    | and use in sys_clone3 (for most arch's):
    | child_stack_ptr = kcs.child_stack_base + kcs.child_stack_size;
    | then the same clone3 interface would cover ia64 as well.


    | Thanks,
    | Roland

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      Last update: 2009-10-14 01:29    [W:0.042 / U:52.404 seconds]
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