in_atomic() is not a reliable indication of whether it is currently safe to call schedule().
This is because the lockdepth beancounting which in_atomic() uses is only accumulated if CONFIG_PREEMPT=y. in_atomic() will return false inside spinlocks if CONFIG_PREEMPT=n. Consequently the use of in_atomic() in the below files is probably deadlocky if CONFIG_PREEMPT=n: arch/ppc64/kernel/viopath.c drivers/net/irda/sir_kthread.c drivers/net/wireless/airo.c drivers/video/amba-clcd.c drivers/acpi/osl.c drivers/ieee1394/ieee1394_transactions.c drivers/infiniband/core/mad.c Note that the same beancounting is used for the "scheduling while atomic" warning, so if the code calls schedule with locks held, we won't get a warning. Both are tied to CONFIG_PREEMPT=y. The kernel provides no reliable runtime way of detecting whether or not it is safe to call schedule(). Can we please find ways to change the above code to not use in_atomic()? Then we can whack #ifndef MODULE around its definition to reduce reoccurrences. Will probably rename it to something more scary as well. Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/