Quoting Sukadev Bhattiprolu (sukadev@xxxxxxxxxxxxxxxxxx):
> (Trimmed Cc to Containers list)
>
> Updated patch to ignore 'child_stack_size' on architectures that don't
> need it (see changelog v13).
>
> ---
>
> >From f87cceae72c2032d67e7855953c0f702957f723a Mon Sep 17 00:00:00 2001
> From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>
> Date: Thu, 12 Nov 2009 15:00:38 -0800
> Subject: [v13][PATCH 9/9] Document eclone() syscall
>
> This gives a brief overview of the eclone() system call. We should
> eventually describe more details in existing clone(2) man page or in
> a new man page.
>
> Changelog[v13-rc1]:
> - [Nathan Lynch, Serge Hallyn] Rename ->child_stack_base to
> ->child_stack and ensure ->child_stack_size is 0 on architectures
> that don't need it.
>
> Changelog[v12]:
> - [Serge Hallyn] Fix/simplify stack-setup in the example code
> - [Serge Hallyn, Oren Laadan] Rename syscall to eclone()
>
> Changelog[v11]:
> - [Dave Hansen] Move clone_args validation checks to arch-indpendent
> code.
> - [Oren Laadan] Make args_size a parameter to system call and remove
> it from 'struct clone_args'
> - [Oren Laadan] Fix some typos and clarify the order of pids in the
> @pids parameter.
>
> Changelog[v10]:
> - Rename clone3() to clone_with_pids() and fix some typos.
> - Modify example to show usage with the ptregs implementation.
> Changelog[v9]:
> - [Pavel Machek]: Fix an inconsistency and rename new file to
> Documentation/clone3.
> - [Roland McGrath, H. Peter Anvin] Updates to description and
> example to reflect new prototype of clone3() and the updated/
> renamed 'struct clone_args'.
>
> Changelog[v8]:
> - clone2() is already in use in IA64. Rename syscall to clone3()
> - Add notes to say that we return -EINVAL if invalid clone flags
> are specified or if the reserved fields are not 0.
> Changelog[v7]:
> - Rename clone_with_pids() to clone2()
> - Changes to reflect new prototype of clone2() (using clone_struct).
>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
> Acked-by: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
except:
...
> +/*
> + * Allocate a stack for the clone-child and arrange to have the child
> + * execute @child_fn with @child_arg as the argument.
> + */
> +void *setup_stack(int (*child_fn)(void *), void *child_arg, int size)
> +{
> + void *stack_base;
> + void **stack_top;
> +
> + stack_base = malloc(size + size);
what is this (size + size) about?
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