Messages in this thread Patch in this message | | | Date | Mon, 27 Aug 2007 10:59:33 -0500 | From | Dean Nelson <> | Subject | [PATCH 1/4] export __put_task_struct for XPMEM |
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This patch exports __put_task_struct as it is needed by XPMEM.
Signed-off-by: Dean Nelson <dcn@sgi.com>
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One struct file_operations registered by XPMEM, xpmem_open(), calls 'get_task_struct(current->group_leader)' and another, xpmem_flush(), calls 'put_task_struct(tg->group_leader)'. The reason for this is given in the comment block that appears in xpmem_open().
/* * Increment 'usage' and 'mm->mm_users' for the current task's thread * group leader. This ensures that both its task_struct and mm_struct * will still be around when our thread group exits. (The Linux kernel * normally tears down the mm_struct prior to calling a module's * 'flush' function.) Since all XPMEM thread groups must go through * this path, this extra reference to mm_users also allows us to * directly inc/dec mm_users in xpmem_ensure_valid_PFNs() and avoid * mmput() which has a scaling issue with the mmlist_lock. */
Index: linux-2.6/kernel/fork.c =================================================================== --- linux-2.6.orig/kernel/fork.c 2007-08-09 07:07:55.426611601 -0500 +++ linux-2.6/kernel/fork.c 2007-08-09 07:15:43.246391700 -0500 @@ -127,6 +127,7 @@ if (!profile_handoff_task(tsk)) free_task(tsk); } +EXPORT_SYMBOL_GPL(__put_task_struct); void __init fork_init(unsigned long mempages) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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