AcoSail/kernel_optimize_test
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[PATCH] copy_process: cosmetic ->ioprio tweak

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copy_process:
// holds tasklist_lock + ->siglock
       /*
        * inherit ioprio
        */
       p->ioprio = current->ioprio;

Why?  ->ioprio was already copied in dup_task_struct().  I guess this is
needed to ensure that the child can't escape
sys_ioprio_set(IOPRIO_WHO_{PGRP,USER}), yes?

In that case we don't need ->siglock held, and the comment should be
updated.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-09-29 02:00:52 -07:00 committed by Linus Torvalds
parent 1c573afebc
commit 5b160f5ecd
1 changed files with 3 additions and 6 deletions
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9
kernel/fork.c
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@ -1150,7 +1150,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
/* Our parent execution domain becomes current domain
These must match for thread signalling to apply */
p->parent_exec_id = p->self_exec_id;
/* ok, now we should be set up.. */
@ -1173,6 +1172,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
/* Need tasklist lock for parent etc handling! */
write_lock_irq(&tasklist_lock);
/* for sys_ioprio_set(IOPRIO_WHO_PGRP) */
p->ioprio = current->ioprio;
/*
* The task hasn't been attached yet, so its cpus_allowed mask will
* not be changed, nor will its assigned CPU.
@ -1232,11 +1234,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
}
}
/*
* inherit ioprio
*/
p->ioprio = current->ioprio;
if (likely(p->pid)) {
add_parent(p);
if (unlikely(p->ptrace & PT_PTRACED))