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authorOleg Nesterov <oleg@tv-sign.ru>2006-09-29 02:00:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:18 -0700
commit5b160f5ecd2f1b6df2e0015dc1f319c8ef803d62 (patch)
treeff7f77b4178299146d6450f01f5d1da769c3fda9
parent1c573afebc6213e4372e0d8352034c23d5262e1f (diff)
[PATCH] copy_process: cosmetic ->ioprio tweak
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>
-rw-r--r--kernel/fork.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index bca6ce6d3de..1c999f3e0b4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -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))