On Mon, 2012-10-29 at 12:38 -0400, Vivek Goyal wrote:
> Ok, so the question is what's wrong with calling synchronize_rcu() inside
> a mutex with CONFIG_PREEMPT=y. I don't know. Ccing paul mckenney and
> peterz.
int blkcg_activate_policy(struct request_queue *q,
{
...
preloaded = !radix_tree_preload(GFP_KERNEL);
blk_queue_bypass_start(q);
where:
int radix_tree_preload(gfp_t gfp_mask)
{
struct radix_tree_preload *rtp;
struct radix_tree_node *node;
int ret = -ENOMEM;
preempt_disable();
Seems obvious why it explodes..
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