On Mon, Oct 26, 2015 at 12:19:31PM +0530, raghu MG wrote: > Hello, > I have couple of questions. > 1) In case of UP how is jiffies(timer) get updated while holding spin > lock using spinlock_irq_save?
It isn't, and... > > 2)My understanding is in smp environment jiffies updation cannot be > done on processor holding spinlock irrespective of spinlock API.So > timer interrupt should be enabled across all cores in SoC. Imagine a > scenario in quad core processor where 4 cores are holding 4 different > spinlocks & how is the timer interrupt for jiffies handled? You can't rely on jiffies being updated while holding a spinlock. Expecting jiffies to update while holding a spinlock is a bug. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- 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/
